Intern symbol names as pointer-free IDs by jakebailey · Pull Request #64699 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-10-08T21:59:08Z

Symbol names are currently plain strings. Every identifier, symbol, symbol table key, and name-keyed cache holds its own 16-byte string header, every lookup hashes and compares the full text, and all of those pointers have to be scanned by the GC. On large projects that adds up to a lot of memory and GC work for what is effectively a small set of repeated names.

This PR interns symbol names instead:

ast.SymbolName is now a pointer-free 64-bit value holding an ID into a process-wide intern table, so names cost one word instead of a string header, compare and hash as integers, and are invisible to the GC. The zero value is the empty name.
Name text lives in a pointer-free arena of length-prefixed records, and a name's ID is its record's offset. Getting a name's text (which every intern hit does to verify a match) is a single dependent load, and the GC never scans any of it. IDs are 32 bits, enough for ~32 GB of name text.
The upper 32 bits encode synthesized names with unbounded numeric parts (private names, unique ES symbols, module patterns, (auto@N)/(generated@N)) as a kind, a number, and the ID of the base text, so they never enter the table. Internal \xFE-prefixed names are tagged too, so IsInternal, IsPrivateName, IsLateBoundName, and friends are bit tests. Storing names in 64 bits rather than 32 is free: every struct and map slot that holds a name aligns its neighbors to 8 bytes anyway.
Fixed names (InternalSymbolName* and friends) are compile-time constants generated by npx hereby generate:ast from one list in tools/scripts/tsc/symbolNames.ts, which also drives the JS InternalSymbolName enum. The generator computes their arena offsets, and the table checks them at startup.
Identifiers are interned once in the parser and the name is stored on Identifier, so the binder, checker, and language service use it directly rather than reinterning node text on each lookup. The AST schema gains a SymbolName type; the JS API still sees strings.
A small per-parser cache lets repeated identifiers in a file skip the shared table, and the scanner hashes identifiers as it scans them so the parser doesn't walk each name a second time.
The shared table is sharded with lock-free lookups. Each shard bump-allocates text from its own arena chunk, and read-mostly and written state are kept on separate cache lines, so parsing in parallel doesn't contend.

Latest perf run: 1.3–3.4% less memory on every project but one tiny one, check up to 9% faster, total time 1–7% faster on most projects (mui-docs 7%, sentry 4%, tanstack-router 3.6%), and no total-time regressions. Parse is 3–9% slower (one 0.014s outlier at 24%), since every identifier is now interned up front; that's down from 5–14% before the arena.

Interned names are never freed. That's bounded per program for tsc, and since synthesized names no longer enter the table, small for the language server too: 50K keystrokes of typing with completions in the compiler project leaves ~4K dead names (~100 KB). Closing large projects leaves their names behind (~17 MB after opening and closing vscode).

Jake Bailey (jakebailey) · 2026-10-08T21:59:46Z

TypeScript Bot (@typescript-bot) perf test this

typescript-automation · 2026-10-08T21:59:53Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this`	✅ Started	👀 Results

typescript-automation · 2026-10-08T22:31:24Z

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_115,276	_115,276	_~	_~	_~	_{p=1.000 n=12}
_Types	_79,613	_79,613	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{135,310k (± 0.08%)}	_{134,555k (± 0.05%)}	_{-754k (- 0.56%)}	_134,394k	_134,762k	_{p=0.000 n=12}
_{Memory Allocs}	_{2,190,636 (± 0.00%)}	_{2,279,198 (± 0.05%)}	_{🔻+88,562 (+ 4.04%)}	_2,275,969	_2,282,067	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.050s (± 2.84%)}	_{0.049s (± 3.22%)}	_~	_0.044s	_0.053s	_{p=0.502 n=12}
_{Bind Time}	_{0.015s (±13.33%)}	_{0.030s (± 7.99%)}	_{🔻+0.015s (+99.45%)}	_0.026s	_0.036s	_{p=0.000 n=12}
_{Check Time}	_{0.615s (± 0.71%)}	_{0.612s (± 0.92%)}	_~	_0.602s	_0.630s	_{p=0.162 n=12}
_{Emit Time}	_{0.329s (± 2.14%)}	_{0.338s (± 1.22%)}	_{+0.009s (+ 2.68%)}	_0.324s	_0.348s	_{p=0.034 n=12}
_{Total Time}	_{1.018s (± 0.96%)}	_{1.037s (± 0.62%)}	_{+0.019s (+ 1.88%)}	_1.021s	_1.057s	_{p=0.001 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{845,989 (± 0.05%)}	_{845,729 (± 0.09%)}	_~	_842,740	_847,317	_{p=0.932 n=12}
_Types	_{248,124 (± 0.00%)}	_{248,123 (± 0.00%)}	_~	_248,122	_248,125	_{p=0.993 n=12}
_{Memory Used}	_{764,653k (± 0.02%)}	_{746,535k (± 0.02%)}	_{-18,119k (- 2.37%)}	_746,119k	_746,997k	_{p=0.000 n=12}
_{Memory Allocs}	_{12,925,262 (± 0.06%)}	_{13,352,078 (± 0.04%)}	_{+426,816 (+ 3.30%)}	_13,345,546	_13,372,669	_{p=0.000 n=12}
_{Config Time}	_{0.016s (± 1.97%)}	_{0.017s (± 1.07%)}	_{+0.001s (+ 3.05%)}	_0.016s	_0.017s	_{p=0.027 n=12}
_{Parse Time}	_{0.257s (± 2.58%)}	_{0.259s (± 2.82%)}	_~	_0.234s	_0.268s	_{p=0.385 n=12}
_{Bind Time}	_{0.063s (±12.33%)}	_{0.100s (±10.80%)}	_{🔻+0.037s (+59.92%)}	_0.092s	_0.150s	_{p=0.000 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.587s (± 1.21%)}	_{1.626s (± 0.86%)}	_{+0.039s (+ 2.45%)}	_1.594s	_1.679s	_{p=0.004 n=12}
_{Total Time}	_{1.937s (± 1.28%)}	_{2.014s (± 0.99%)}	_{+0.076s (+ 3.94%)}	_1.979s	_2.101s	_{p=0.000 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,359,614	_4,359,614	_~	_~	_~	_{p=1.000 n=12}
_Types	_1,376,379	_1,376,379	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,874,210k (± 0.05%)}	_{2,568,218k (± 0.05%)}	_{🟩-305,992k (-10.65%)}	_2,564,693k	_2,571,397k	_{p=0.000 n=12}
_{Memory Allocs}	_{32,870,213 (± 0.08%)}	_{33,621,012 (± 0.06%)}	_{+750,799 (+ 2.28%)}	_33,575,749	_33,692,494	_{p=0.000 n=12}
_{Config Time}	_{0.020s (± 1.21%)}	_{0.020s (± 1.52%)}	_~	_0.020s	_0.021s	_{p=0.640 n=12}
_{Parse Time}	_{0.624s (± 2.60%)}	_{0.604s (± 2.39%)}	_{🟩-0.020s (- 3.14%)}	_0.568s	_0.640s	_{p=0.050 n=12}
_{Bind Time}	_{0.003s (±13.14%)}	_{0.003s (±12.54%)}	_~	_0.002s	_0.003s	_{p=1.000 n=12}
_{Check Time}	_{10.344s (± 0.63%)}	_{9.367s (± 0.38%)}	_{🟩-0.977s (- 9.44%)}	_9.291s	_9.463s	_{p=0.000 n=12}
_{Emit Time}	_{0.510s (± 1.88%)}	_{0.513s (± 1.14%)}	_~	_0.505s	_0.535s	_{p=0.199 n=12}
_{Total Time}	_{12.430s (± 0.51%)}	_{11.545s (± 0.32%)}	_{🟩-0.886s (- 7.12%)}	_11.449s	_11.644s	_{p=0.000 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,390,229	_1,390,229	_~	_~	_~	_{p=1.000 n=12}
_Types	_441,498	_441,498	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,641,820k (± 0.88%)}	_{1,623,524k (± 0.28%)}	_{-18,296k (- 1.11%)}	_1,612,197k	_1,634,391k	_{p=0.028 n=12}
_{Memory Allocs}	_{92,093,413 (± 0.16%)}	_{95,246,262 (± 0.15%)}	_{+3,152,849 (+ 3.42%)}	_94,939,040	_95,592,937	_{p=0.000 n=12}
_{Config Time}	_{0.003s (±14.60%)}	_{0.003s (±14.59%)}	_~	_0.002s	_0.004s	_{p=0.784 n=12}
_{Parse Time}	_{0.191s (± 4.22%)}	_{0.188s (± 2.57%)}	_~	_0.176s	_0.199s	_{p=0.639 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.820s (± 0.66%)}	_{1.888s (± 0.45%)}	_{+0.068s (+ 3.72%)}	_1.869s	_1.908s	_{p=0.000 n=12}
_{Emit Time}	_{0.305s (± 5.01%)}	_{0.321s (± 4.73%)}	_~	_0.283s	_0.372s	_{p=0.173 n=12}
_{Total Time}	_{23.652s (± 0.97%)}	_{24.999s (± 0.56%)}	_{🔻+1.347s (+ 5.70%)}	_24.737s	_25.487s	_{p=0.000 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_334,953	_334,953	_~	_~	_~	_{p=1.000 n=12}
_Types	_197,616	_197,616	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{302,588k (± 0.03%)}	_{299,768k (± 0.02%)}	_{-2,820k (- 0.93%)}	_299,594k	_299,874k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,622,914 (± 0.01%)}	_{4,830,806 (± 0.01%)}	_{🔻+207,892 (+ 4.50%)}	_4,830,094	_4,831,876	_{p=0.000 n=12}
_{Config Time}	_{0.001s (±29.38%)}	_{0.001s (±65.70%)}	_~	_0.000s	_0.001s	_{p=0.193 n=12}
_{Parse Time}	_{0.092s (± 5.04%)}	_{0.095s (± 4.82%)}	_~	_0.083s	_0.110s	_{p=0.223 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{0.878s (± 0.68%)}	_{0.912s (± 0.42%)}	_{+0.034s (+ 3.83%)}	_0.900s	_0.920s	_{p=0.000 n=12}
_{Emit Time}	_{0.109s (±10.35%)}	_{0.124s (± 6.74%)}	_{🔻+0.015s (+13.72%)}	_0.098s	_0.140s	_{p=0.013 n=12}
_{Total Time}	_{1.121s (± 1.06%)}	_{1.201s (± 1.07%)}	_{🔻+0.081s (+ 7.20%)}	_1.160s	_1.235s	_{p=0.000 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_303,834	_303,834	_~	_~	_~	_{p=1.000 n=12}
_Types	_181,663	_181,663	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{263,493k (± 0.02%)}	_{260,182k (± 0.02%)}	_{-3,311k (- 1.26%)}	_259,924k	_260,272k	_{p=0.000 n=12}
_{Memory Allocs}	_{1,616,022 (± 0.01%)}	_{1,791,998 (± 0.01%)}	_{🔻+175,976 (+10.89%)}	_1,791,727	_1,792,462	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.099s (± 3.19%)}	_{0.098s (± 4.94%)}	_~	_0.089s	_0.108s	_{p=0.832 n=12}
_{Bind Time}	_{0.037s (± 9.76%)}	_{0.070s (± 7.91%)}	_{🔻+0.034s (+90.97%)}	_0.058s	_0.081s	_{p=0.000 n=12}
_{Check Time}	_{0.829s (± 0.76%)}	_{0.860s (± 0.82%)}	_{+0.031s (+ 3.69%)}	_0.844s	_0.878s	_{p=0.000 n=12}
_{Emit Time}	_{0.000s (±217.90%)}	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.981s (± 0.53%)}	_{1.043s (± 0.71%)}	_{🔻+0.062s (+ 6.29%)}	_1.026s	_1.069s	_{p=0.000 n=12}
_{vscode - native}
_Errors	₃₈₀	₃₈₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_11,126,412	_11,126,412	_~	_~	_~	_{p=1.000 n=12}
_Types	_3,695,451	_3,695,451	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{6,709,468k (± 0.02%)}	_{6,472,806k (± 0.02%)}	_{🟩-236,662k (- 3.53%)}	_6,468,963k	_6,477,601k	_{p=0.000 n=12}
_{Memory Allocs}	_{54,762,461 (± 0.03%)}	_{56,714,048 (± 0.02%)}	_{+1,951,587 (+ 3.56%)}	_56,703,781	_56,758,908	_{p=0.000 n=12}
_{Config Time}	_{0.073s (± 0.56%)}	_{0.074s (± 0.44%)}	_{+0.001s (+ 1.48%)}	_0.074s	_0.075s	_{p=0.000 n=12}
_{Parse Time}	_{1.812s (± 3.88%)}	_{1.836s (± 3.66%)}	_~	_1.672s	_2.035s	_{p=0.671 n=12}
_{Bind Time}	_{0.622s (±18.49%)}	_{0.831s (±15.00%)}	_{🔻+0.209s (+33.64%)}	_0.690s	_1.232s	_{p=0.018 n=12}
_{Check Time}	_{13.958s (± 1.17%)}	_{14.712s (± 0.99%)}	_{🔻+0.753s (+ 5.40%)}	_14.238s	_14.937s	_{p=0.000 n=12}
_{Emit Time}	_{4.908s (±12.67%)}	_{4.654s (± 8.71%)}	_~	_4.184s	_6.004s	_{p=0.443 n=12}
_{Total Time}	_{21.463s (± 2.41%)}	_{22.186s (± 1.51%)}	_~	_21.711s	_23.306s	_{p=0.143 n=12}
_{webpack - native}
_Errors	₅₈₉	₅₈₉	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,304,270	_1,304,270	_~	_~	_~	_{p=1.000 n=12}
_Types	_618,461	_618,461	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{958,988k (± 0.01%)}	_{925,774k (± 0.02%)}	_{🟩-33,214k (- 3.46%)}	_925,297k	_926,313k	_{p=0.000 n=12}
_{Memory Allocs}	_{6,606,657 (± 0.01%)}	_{7,086,476 (± 0.04%)}	_{🔻+479,819 (+ 7.26%)}	_7,081,900	_7,094,237	_{p=0.000 n=12}
_{Config Time}	_0.009s	_0.009s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.288s (± 3.23%)}	_{0.291s (± 3.25%)}	_~	_0.267s	_0.319s	_{p=0.744 n=12}
_{Bind Time}	_{0.086s (±20.33%)}	_{0.128s (±10.05%)}	_{🔻+0.042s (+49.03%)}	_0.107s	_0.177s	_{p=0.001 n=12}
_{Check Time}	_{2.073s (± 1.02%)}	_{2.127s (± 0.88%)}	_{+0.054s (+ 2.62%)}	_2.073s	_2.162s	_{p=0.001 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{2.491s (± 0.52%)}	_{2.591s (± 0.63%)}	_{🔻+0.101s (+ 4.03%)}	_2.558s	_2.639s	_{p=0.000 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,055,452	_1,055,452	_~	_~	_~	_{p=1.000 n=12}
_Types	_386,738	_386,738	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{570,764k (± 0.03%)}	_{545,375k (± 0.03%)}	_{🟩-25,389k (- 4.45%)}	_545,072k	_545,991k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,859,932 (± 0.08%)}	_{5,156,372 (± 0.09%)}	_{🔻+296,440 (+ 6.10%)}	_5,146,655	_5,173,137	_{p=0.000 n=12}
_{Config Time}	_{0.003s (± 6.23%)}	_{0.003s (± 6.23%)}	_~	_0.002s	_0.003s	_{p=1.000 n=12}
_{Parse Time}	_{0.143s (± 2.40%)}	_{0.145s (± 3.12%)}	_~	_0.131s	_0.154s	_{p=0.416 n=12}
_{Bind Time}	_{0.044s (±21.01%)}	_{0.090s (±12.08%)}	_{🔻+0.046s (+104.91%)}	_0.066s	_0.111s	_{p=0.000 n=12}
_{Check Time}	_{1.128s (± 0.48%)}	_{1.130s (± 0.74%)}	_~	_1.112s	_1.164s	_{p=0.660 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.324s (± 0.56%)}	_{1.374s (± 0.76%)}	_{+0.050s (+ 3.78%)}	_1.344s	_1.394s	_{p=0.000 n=12}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
mui-docs - native
strada-build-src - native
strada-compiler - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

lsp

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-UnionsLSP - native}
_{Req 1 - updateOpen}	_{13ms (±10.94%)}	_{14ms (±10.03%)}	_~	_11ms	_17ms	_{p=0.513 n=12}
_{Req 2 - geterr}	_{699ms (± 0.41%)}	_{709ms (± 0.64%)}	_{+9ms (+ 1.33%)}	_697ms	_717ms	_{p=0.002 n=12}
_{Req 3 - references}	_{53ms (± 4.78%)}	_{52ms (± 7.15%)}	_~	_43ms	_62ms	_{p=0.382 n=12}
_{Req 4 - navto}	_{20ms (± 3.00%)}	_{20ms (± 6.07%)}	_~	_18ms	_26ms	_{p=0.383 n=12}
_{Req 5 - completionInfo count}	_1,363	_1,363	_~	_~	_~	_{p=1.000 n=12}
_{Req 5 - completionInfo}	_{20ms (± 7.01%)}	_{20ms (±11.54%)}	_~	_16ms	_30ms	_{p=0.136 n=12}
_{CompilerLSP - native}
_{Req 1 - updateOpen}	_{12ms (±13.27%)}	_{11ms (±10.67%)}	_~	_10ms	_15ms	_{p=1.000 n=12}
_{Req 2 - geterr}	_{298ms (± 0.64%)}	_{318ms (± 0.60%)}	_{🔻+20ms (+ 6.76%)}	_313ms	_324ms	_{p=0.000 n=12}
_{Req 3 - references}	_{50ms (± 3.62%)}	_{49ms (± 4.22%)}	_~	_44ms	_54ms	_{p=0.678 n=12}
_{Req 4 - navto}	_{17ms (± 3.43%)}	_{17ms (± 2.54%)}	_~	_15ms	_17ms	_{p=0.167 n=12}
_{Req 5 - completionInfo count}	_1,525	_1,525	_~	_~	_~	_{p=1.000 n=12}
_{Req 5 - completionInfo}	_{17ms (± 6.11%)}	_{17ms (± 6.98%)}	_~	_15ms	_21ms	_{p=0.741 n=12}

System info unknown

Hosts

native

Scenarios

CompilerLSP - native
Compiler-UnionsLSP - native
xstate-main-1-LSP - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

startup

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{lsp-startup - native}
_{Execution time}	_{4.80ms (±365.08%)}	_{4.83ms (±365.09%)}	_{+0.03ms (+ 0.62%)}	_0.00ms	_491.10ms	_{p=0.000 n=1200}
_{tsgo-startup - native}
_{Execution time}	_{5.83ms (±365.09%)}	_{5.88ms (±365.08%)}	_{+0.04ms (+ 0.73%)}	_0.00ms	_593.40ms	_{p=0.000 n=1200}

System info unknown

Hosts

native

Scenarios

lsp-startup - native
tsgo-startup - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

Developer Information:

Download Benchmarks

Jake Bailey (jakebailey) · 2026-10-15T17:22:10Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-10-15T17:22:16Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this faster`	✅ Started	👀 Results

typescript-automation · 2026-10-15T17:52:21Z

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_115,276	_115,276	_~	_~	_~	_{p=1.000 n=12}
_Types	_79,613	_79,613	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{113,479k (± 0.05%)}	_{109,247k (± 0.06%)}	_{🟩-4,232k (- 3.73%)}	_109,072k	_109,388k	_{p=0.000 n=12}
_{Memory Allocs}	_{2,212,486 (± 0.01%)}	_{2,220,023 (± 0.01%)}	_{+7,536 (+ 0.34%)}	_2,219,635	_2,220,280	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.039s (± 4.40%)}	_{0.044s (± 3.77%)}	_{🔻+0.005s (+13.03%)}	_0.040s	_0.048s	_{p=0.000 n=12}
_{Bind Time}	_{0.013s (±10.03%)}	_{0.013s (± 8.82%)}	_~	_0.010s	_0.017s	_{p=0.395 n=12}
_{Check Time}	_{0.467s (± 0.43%)}	_{0.456s (± 0.84%)}	_{-0.010s (- 2.23%)}	_0.448s	_0.465s	_{p=0.000 n=12}
_{Emit Time}	_{0.265s (± 1.66%)}	_{0.267s (± 1.43%)}	_~	_0.258s	_0.276s	_{p=0.579 n=12}
_{Total Time}	_{0.791s (± 0.67%)}	_{0.786s (± 0.42%)}	_~	_0.781s	_0.795s	_{p=0.103 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{847,026 (± 0.07%)}	_{847,024 (± 0.11%)}	_~	_844,638	_849,050	_{p=0.887 n=12}
_Types	_{247,032 (± 0.00%)}	_{247,032 (± 0.00%)}	_~	_247,030	_247,042	_{p=0.548 n=12}
_{Memory Used}	_{596,379k (± 0.03%)}	_{560,230k (± 0.03%)}	_{🟩-36,149k (- 6.06%)}	_559,817k	_560,650k	_{p=0.000 n=12}
_{Memory Allocs}	_{13,149,404 (± 0.09%)}	_{13,172,319 (± 0.05%)}	_{+22,915 (+ 0.17%)}	_13,168,352	_13,205,949	_{p=0.001 n=12}
_{Config Time}	_{0.017s (± 1.45%)}	_{0.017s (± 1.07%)}	_~	_0.016s	_0.017s	_{p=1.000 n=12}
_{Parse Time}	_{0.221s (± 2.54%)}	_{0.245s (± 4.57%)}	_{🔻+0.024s (+10.71%)}	_0.220s	_0.283s	_{p=0.000 n=12}
_{Bind Time}	_{0.088s (±13.82%)}	_{0.067s (±15.71%)}	_{🟩-0.021s (-24.22%)}	_0.056s	_0.100s	_{p=0.005 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.559s (± 1.24%)}	_{1.532s (± 1.28%)}	_{-0.027s (- 1.74%)}	_1.484s	_1.597s	_{p=0.046 n=12}
_{Total Time}	_{1.904s (± 0.95%)}	_{1.874s (± 1.06%)}	_{-0.031s (- 1.61%)}	_1.811s	_1.922s	_{p=0.020 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,331,835	_4,331,835	_~	_~	_~	_{p=1.000 n=12}
_Types	_1,370,520	_1,370,520	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,626,589k (± 0.07%)}	_{2,273,471k (± 0.08%)}	_{🟩-353,118k (-13.44%)}	_2,269,818k	_2,278,100k	_{p=0.000 n=12}
_{Memory Allocs}	_{27,705,934 (± 0.05%)}	_{27,696,753 (± 0.06%)}	_~	_27,658,960	_27,747,847	_{p=0.551 n=12}
_{Config Time}	_{0.017s (± 1.86%)}	_0.017s	_~	_~	_~	_{p=0.093 n=12}
_{Parse Time}	_{0.468s (± 3.07%)}	_{0.476s (± 4.02%)}	_~	_0.429s	_0.513s	_{p=0.451 n=12}
_{Bind Time}	_0.002s	_{0.002s (± 9.47%)}	_~	_0.001s	_0.002s	_{p=1.000 n=12}
_{Check Time}	_{7.273s (± 0.66%)}	_{6.394s (± 0.42%)}	_{🟩-0.879s (-12.09%)}	_6.365s	_6.491s	_{p=0.000 n=12}
_{Emit Time}	_{0.497s (±11.53%)}	_{0.461s (± 2.62%)}	_~	_0.420s	_0.472s	_{p=0.787 n=12}
_{Total Time}	_{8.998s (± 0.74%)}	_{8.100s (± 0.22%)}	_{🟩-0.897s (- 9.97%)}	_8.055s	_8.145s	_{p=0.000 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,388,669	_1,388,669	_~	_~	_~	_{p=1.000 n=12}
_Types	_441,862	_441,862	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,317,489k (± 0.62%)}	_{1,250,199k (± 0.49%)}	_{🟩-67,289k (- 5.11%)}	_1,232,740k	_1,272,021k	_{p=0.000 n=12}
_{Memory Allocs}	_{78,188,492 (± 0.06%)}	_{78,316,018 (± 0.15%)}	_{+127,526 (+ 0.16%)}	_77,974,859	_78,560,994	_{p=0.020 n=12}
_{Config Time}	_{0.003s (± 8.75%)}	_{0.006s (±13.52%)}	_{🔻+0.003s (+97.44%)}	_0.004s	_0.009s	_{p=0.000 n=12}
_{Parse Time}	_{0.252s (± 3.11%)}	_{0.279s (± 1.60%)}	_{🔻+0.027s (+10.74%)}	_0.267s	_0.291s	_{p=0.000 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.677s (± 0.53%)}	_{1.617s (± 0.39%)}	_{🟩-0.061s (- 3.61%)}	_1.596s	_1.633s	_{p=0.000 n=12}
_{Emit Time}	_{0.297s (± 3.44%)}	_{0.284s (± 3.71%)}	_~	_0.253s	_0.310s	_{p=0.061 n=12}
_{Total Time}	_{19.834s (± 0.51%)}	_{19.290s (± 0.58%)}	_{-0.544s (- 2.74%)}	_19.005s	_19.590s	_{p=0.000 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_334,953	_334,953	_~	_~	_~	_{p=1.000 n=12}
_Types	_197,616	_197,616	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{247,512k (± 0.03%)}	_{235,878k (± 0.03%)}	_{🟩-11,634k (- 4.70%)}	_235,668k	_236,047k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,329,530 (± 0.01%)}	_{4,347,875 (± 0.01%)}	_{+18,345 (+ 0.42%)}	_4,346,250	_4,348,965	_{p=0.000 n=12}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.111s (± 5.77%)}	_{0.127s (± 2.34%)}	_{🔻+0.016s (+14.15%)}	_0.118s	_0.134s	_{p=0.000 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{0.961s (± 0.56%)}	_{0.945s (± 0.48%)}	_{-0.016s (- 1.65%)}	_0.933s	_0.957s	_{p=0.000 n=12}
_{Emit Time}	_{0.145s (± 4.78%)}	_{0.149s (± 3.81%)}	_~	_0.129s	_0.161s	_{p=0.522 n=12}
_{Total Time}	_{1.273s (± 0.77%)}	_{1.273s (± 0.60%)}	_~	_1.251s	_1.288s	_{p=0.744 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_303,834	_303,834	_~	_~	_~	_{p=1.000 n=12}
_Types	_181,663	_181,663	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{215,246k (± 0.02%)}	_{204,557k (± 0.02%)}	_{🟩-10,689k (- 4.97%)}	_204,473k	_204,646k	_{p=0.000 n=12}
_{Memory Allocs}	_{1,401,509 (± 0.01%)}	_{1,417,139 (± 0.02%)}	_{+15,630 (+ 1.12%)}	_1,416,670	_1,417,761	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.096s (± 3.98%)}	_{0.110s (± 4.09%)}	_{🔻+0.015s (+15.16%)}	_0.099s	_0.121s	_{p=0.000 n=12}
_{Bind Time}	_{0.043s (± 8.47%)}	_{0.039s (±10.15%)}	_~	_0.032s	_0.051s	_{p=0.102 n=12}
_{Check Time}	_{0.747s (± 0.83%)}	_{0.729s (± 0.88%)}	_{-0.017s (- 2.33%)}	_0.715s	_0.743s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.900s (± 0.64%)}	_{0.893s (± 0.77%)}	_~	_0.876s	_0.909s	_{p=0.181 n=12}
_{vscode - native}
_Errors	₃₉₆	₃₉₆	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_11,850,414	_11,850,414	_~	_~	_~	_{p=1.000 n=12}
_Types	_3,908,124	_3,908,124	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{5,600,881k (± 0.02%)}	_{5,216,068k (± 0.03%)}	_{🟩-384,813k (- 6.87%)}	_5,213,135k	_5,220,738k	_{p=0.000 n=12}
_{Memory Allocs}	_{57,029,448 (± 0.10%)}	_{57,054,527 (± 0.02%)}	_{+25,079 (+ 0.04%)}	_57,033,205	_57,086,847	_{p=0.000 n=12}
_{Config Time}	_{0.075s (± 0.43%)}	_{0.076s (± 0.86%)}	_~	_0.075s	_0.079s	_{p=0.150 n=12}
_{Parse Time}	_{1.754s (± 2.09%)}	_{1.903s (± 2.04%)}	_{🔻+0.149s (+ 8.49%)}	_1.774s	_2.010s	_{p=0.000 n=12}
_{Bind Time}	_{0.669s (±13.18%)}	_{0.549s (±13.23%)}	_{🟩-0.120s (-17.90%)}	_0.472s	_0.807s	_{p=0.010 n=12}
_{Check Time}	_{14.650s (± 0.74%)}	_{14.531s (± 0.84%)}	_~	_14.190s	_14.751s	_{p=0.514 n=12}
_{Emit Time}	_{5.671s (± 7.34%)}	_{5.544s (± 6.48%)}	_~	_4.461s	_6.013s	_{p=0.561 n=12}
_{Total Time}	_{22.911s (± 1.46%)}	_{22.686s (± 1.56%)}	_~	_21.652s	_23.230s	_{p=0.347 n=12}
_{webpack - native}
_Errors	₅₈₄	₅₈₄	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,297,360	_1,297,360	_~	_~	_~	_{p=1.000 n=12}
_Types	_593,542	_593,542	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{784,599k (± 0.03%)}	_{731,203k (± 0.03%)}	_{🟩-53,396k (- 6.81%)}	_730,793k	_731,773k	_{p=0.000 n=12}
_{Memory Allocs}	_{6,034,028 (± 0.06%)}	_{6,068,414 (± 0.04%)}	_{+34,386 (+ 0.57%)}	_6,063,913	_6,075,621	_{p=0.000 n=12}
_{Config Time}	_0.009s	_{0.009s (± 2.00%)}	_~	_0.009s	_0.010s	_{p=1.000 n=12}
_{Parse Time}	_{0.302s (± 3.50%)}	_{0.306s (± 2.98%)}	_~	_0.279s	_0.338s	_{p=0.560 n=12}
_{Bind Time}	_{0.074s (± 3.57%)}	_{0.075s (± 8.70%)}	_~	_0.064s	_0.095s	_{p=0.560 n=12}
_{Check Time}	_{2.133s (± 0.60%)}	_{2.055s (± 0.43%)}	_{🟩-0.077s (- 3.63%)}	_2.032s	_2.077s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{2.554s (± 0.65%)}	_{2.483s (± 0.57%)}	_{-0.070s (- 2.75%)}	_2.457s	_2.528s	_{p=0.000 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,062,854	_1,062,854	_~	_~	_~	_{p=1.000 n=12}
_Types	_390,845	_390,845	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{472,259k (± 0.02%)}	_{434,074k (± 0.03%)}	_{🟩-38,185k (- 8.09%)}	_433,757k	_434,462k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,223,835 (± 0.07%)}	_{4,245,930 (± 0.06%)}	_{+22,095 (+ 0.52%)}	_4,238,989	_4,253,061	_{p=0.000 n=12}
_{Config Time}	_{0.003s (± 6.23%)}	_{0.003s (± 8.64%)}	_~	_0.002s	_0.003s	_{p=1.000 n=12}
_{Parse Time}	_{0.133s (± 3.58%)}	_{0.148s (± 2.41%)}	_{🔻+0.014s (+10.75%)}	_0.138s	_0.156s	_{p=0.000 n=12}
_{Bind Time}	_{0.049s (±18.00%)}	_{0.039s (±11.68%)}	_~	_0.032s	_0.051s	_{p=0.074 n=12}
_{Check Time}	_{1.010s (± 0.74%)}	_{0.966s (± 0.87%)}	_{🟩-0.044s (- 4.36%)}	_0.946s	_0.989s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.202s (± 0.48%)}	_{1.164s (± 0.70%)}	_{🟩-0.038s (- 3.13%)}	_1.141s	_1.177s	_{p=0.000 n=12}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
mui-docs - native
strada-build-src - native
strada-compiler - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

Developer Information:

Download Benchmarks

Jake Bailey (jakebailey) · 2026-10-15T19:22:12Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-10-15T19:22:19Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this faster`	✅ Started	👀 Results

typescript-automation · 2026-10-15T19:55:31Z

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_115,276	_115,276	_~	_~	_~	_{p=1.000 n=12}
_Types	_79,613	_79,613	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{113,544k (± 0.07%)}	_{109,252k (± 0.04%)}	_{🟩-4,292k (- 3.78%)}	_109,128k	_109,360k	_{p=0.000 n=12}
_{Memory Allocs}	_{2,212,499 (± 0.01%)}	_{2,220,006 (± 0.01%)}	_{+7,508 (+ 0.34%)}	_2,219,689	_2,220,362	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.038s (± 4.50%)}	_{0.043s (± 2.88%)}	_{🔻+0.005s (+13.63%)}	_0.040s	_0.046s	_{p=0.000 n=12}
_{Bind Time}	_{0.014s (± 9.15%)}	_{0.012s (± 7.92%)}	_~	_0.011s	_0.015s	_{p=0.138 n=12}
_{Check Time}	_{0.469s (± 0.80%)}	_{0.452s (± 0.62%)}	_{🟩-0.016s (- 3.45%)}	_0.446s	_0.461s	_{p=0.000 n=12}
_{Emit Time}	_{0.269s (± 2.12%)}	_{0.269s (± 2.28%)}	_~	_0.254s	_0.285s	_{p=0.944 n=12}
_{Total Time}	_{0.796s (± 0.90%)}	_{0.784s (± 0.73%)}	_{-0.012s (- 1.54%)}	_0.769s	_0.799s	_{p=0.011 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{847,116 (± 0.08%)}	_{847,194 (± 0.08%)}	_~	_845,430	_848,650	_{p=0.887 n=12}
_Types	_{247,033 (± 0.00%)}	_{247,032 (± 0.00%)}	_~	_247,030	_247,034	_{p=0.390 n=12}
_{Memory Used}	_{596,464k (± 0.02%)}	_{560,313k (± 0.03%)}	_{🟩-36,151k (- 6.06%)}	_559,807k	_560,648k	_{p=0.000 n=12}
_{Memory Allocs}	_{13,143,148 (± 0.05%)}	_{13,173,236 (± 0.04%)}	_{+30,088 (+ 0.23%)}	_13,166,102	_13,191,128	_{p=0.000 n=12}
_{Config Time}	_{0.020s (± 1.40%)}	_{0.021s (± 6.20%)}	_~	_0.020s	_0.025s	_{p=0.443 n=12}
_{Parse Time}	_{0.286s (± 2.63%)}	_{0.310s (± 2.80%)}	_{🔻+0.024s (+ 8.36%)}	_0.288s	_0.326s	_{p=0.000 n=12}
_{Bind Time}	_{0.108s (±12.71%)}	_{0.095s (±13.89%)}	_~	_0.076s	_0.135s	_{p=0.190 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.907s (± 1.25%)}	_{1.928s (± 2.31%)}	_~	_1.782s	_2.037s	_{p=0.284 n=12}
_{Total Time}	_{2.344s (± 1.13%)}	_{2.374s (± 1.89%)}	_~	_2.211s	_2.471s	_{p=0.117 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,331,835	_4,331,835	_~	_~	_~	_{p=1.000 n=12}
_Types	_1,370,520	_1,370,520	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,625,369k (± 0.06%)}	_{2,272,617k (± 0.07%)}	_{🟩-352,751k (-13.44%)}	_2,268,756k	_2,277,064k	_{p=0.000 n=12}
_{Memory Allocs}	_{27,722,151 (± 0.14%)}	_{27,711,856 (± 0.13%)}	_~	_27,664,278	_27,886,220	_{p=0.551 n=12}
_{Config Time}	_{0.020s (± 1.59%)}	_{0.020s (± 0.90%)}	_~	_0.020s	_0.021s	_{p=0.155 n=12}
_{Parse Time}	_{0.593s (± 3.32%)}	_{0.604s (± 2.86%)}	_~	_0.551s	_0.655s	_{p=0.124 n=12}
_{Bind Time}	_{0.003s (± 8.64%)}	_{0.002s (±13.40%)}	_~	_0.002s	_0.003s	_{p=0.089 n=12}
_{Check Time}	_{8.655s (± 0.16%)}	_{7.611s (± 0.46%)}	_{🟩-1.043s (-12.06%)}	_7.572s	_7.740s	_{p=0.000 n=12}
_{Emit Time}	_{0.750s (± 8.09%)}	_{0.565s (± 3.04%)}	_{🟩-0.184s (-24.57%)}	_0.506s	_0.583s	_{p=0.000 n=12}
_{Total Time}	_{10.937s (± 0.67%)}	_{9.717s (± 0.28%)}	_{🟩-1.220s (-11.15%)}	_9.639s	_9.792s	_{p=0.000 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,388,669	_1,388,669	_~	_~	_~	_{p=1.000 n=12}
_Types	_441,862	_441,862	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,318,031k (± 0.91%)}	_{1,249,734k (± 0.54%)}	_{🟩-68,297k (- 5.18%)}	_1,234,336k	_1,275,228k	_{p=0.000 n=12}
_{Memory Allocs}	_{78,217,623 (± 0.06%)}	_{78,188,817 (± 0.17%)}	_~	_77,764,171	_78,445,656	_{p=0.755 n=12}
_{Config Time}	_{0.004s (± 9.20%)}	_{0.008s (±18.01%)}	_{🔻+0.004s (+90.20%)}	_0.005s	_0.012s	_{p=0.000 n=12}
_{Parse Time}	_{0.308s (± 2.05%)}	_{0.327s (± 1.92%)}	_{🔻+0.019s (+ 6.25%)}	_0.309s	_0.341s	_{p=0.001 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{2.000s (± 0.55%)}	_{1.934s (± 0.36%)}	_{🟩-0.066s (- 3.31%)}	_1.916s	_1.949s	_{p=0.000 n=12}
_{Emit Time}	_{0.342s (± 3.89%)}	_{0.342s (± 1.98%)}	_~	_0.328s	_0.361s	_{p=0.745 n=12}
_{Total Time}	_{23.672s (± 0.48%)}	_{23.174s (± 0.55%)}	_{-0.498s (- 2.10%)}	_22.829s	_23.533s	_{p=0.000 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_334,953	_334,953	_~	_~	_~	_{p=1.000 n=12}
_Types	_197,616	_197,616	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{247,527k (± 0.03%)}	_{235,858k (± 0.03%)}	_{🟩-11,669k (- 4.71%)}	_235,696k	_236,027k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,329,509 (± 0.01%)}	_{4,347,864 (± 0.01%)}	_{+18,355 (+ 0.42%)}	_4,346,840	_4,349,273	_{p=0.000 n=12}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.113s (± 5.39%)}	_{0.128s (± 3.31%)}	_{🔻+0.015s (+13.03%)}	_0.110s	_0.137s	_{p=0.001 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{0.962s (± 0.72%)}	_{0.950s (± 0.61%)}	_{-0.013s (- 1.30%)}	_0.935s	_0.969s	_{p=0.002 n=12}
_{Emit Time}	_{0.147s (± 7.01%)}	_{0.143s (± 4.22%)}	_~	_0.126s	_0.156s	_{p=0.854 n=12}
_{Total Time}	_{1.276s (± 1.00%)}	_{1.273s (± 0.82%)}	_~	_1.236s	_1.294s	_{p=1.000 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_303,834	_303,834	_~	_~	_~	_{p=1.000 n=12}
_Types	_181,663	_181,663	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{215,249k (± 0.02%)}	_{204,556k (± 0.02%)}	_{🟩-10,693k (- 4.97%)}	_204,493k	_204,649k	_{p=0.000 n=12}
_{Memory Allocs}	_{1,401,614 (± 0.01%)}	_{1,417,302 (± 0.01%)}	_{+15,688 (+ 1.12%)}	_1,416,588	_1,417,751	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.080s (± 4.55%)}	_{0.085s (± 3.45%)}	_{🔻+0.005s (+ 6.88%)}	_0.077s	_0.094s	_{p=0.023 n=12}
_{Bind Time}	_{0.034s (± 7.66%)}	_{0.030s (±10.12%)}	_~	_0.023s	_0.037s	_{p=0.066 n=12}
_{Check Time}	_{0.617s (± 0.86%)}	_{0.607s (± 1.27%)}	_{-0.011s (- 1.75%)}	_0.593s	_0.632s	_{p=0.016 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.743s (± 0.73%)}	_{0.734s (± 1.15%)}	_{-0.009s (- 1.22%)}	_0.721s	_0.764s	_{p=0.027 n=12}
_{vscode - native}
_Errors	₃₉₆	₃₉₆	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_11,858,782	_11,858,782	_~	_~	_~	_{p=1.000 n=12}
_Types	_3,913,076	_3,913,076	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{5,602,594k (± 0.02%)}	_{5,217,111k (± 0.02%)}	_{🟩-385,483k (- 6.88%)}	_5,214,586k	_5,220,496k	_{p=0.000 n=12}
_{Memory Allocs}	_{57,046,573 (± 0.00%)}	_{57,097,906 (± 0.02%)}	_{+51,333 (+ 0.09%)}	_57,077,234	_57,127,863	_{p=0.000 n=12}
_{Config Time}	_{0.075s (± 0.70%)}	_{0.075s (± 0.33%)}	_~	_0.075s	_0.076s	_{p=1.000 n=12}
_{Parse Time}	_{1.812s (± 2.12%)}	_{1.923s (± 2.43%)}	_{🔻+0.111s (+ 6.13%)}	_1.725s	_2.029s	_{p=0.001 n=12}
_{Bind Time}	_{0.573s (±10.43%)}	_{0.501s (±12.43%)}	_{🟩-0.072s (-12.56%)}	_0.452s	_0.814s	_{p=0.000 n=12}
_{Check Time}	_{14.773s (± 1.06%)}	_{14.516s (± 0.63%)}	_~	_14.125s	_14.686s	_{p=0.097 n=12}
_{Emit Time}	_{5.620s (± 6.22%)}	_{5.089s (± 6.75%)}	_{🟩-0.530s (- 9.44%)}	_4.394s	_6.185s	_{p=0.028 n=12}
_{Total Time}	_{22.940s (± 1.16%)}	_{22.183s (± 1.51%)}	_{🟩-0.757s (- 3.30%)}	_21.501s	_23.093s	_{p=0.002 n=12}
_{webpack - native}
_Errors	₅₈₄	₅₈₄	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,286,346	_1,286,346	_~	_~	_~	_{p=1.000 n=12}
_Types	_586,899	_586,899	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{775,946k (± 0.02%)}	_{724,486k (± 0.01%)}	_{🟩-51,460k (- 6.63%)}	_724,244k	_724,703k	_{p=0.000 n=12}
_{Memory Allocs}	_{5,993,657 (± 0.03%)}	_{6,030,764 (± 0.02%)}	_{+37,106 (+ 0.62%)}	_6,028,538	_6,035,314	_{p=0.000 n=12}
_{Config Time}	_0.009s	_0.009s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.309s (± 2.75%)}	_{0.311s (± 3.07%)}	_~	_0.292s	_0.343s	_{p=0.810 n=12}
_{Bind Time}	_{0.068s (± 1.94%)}	_{0.069s (± 3.98%)}	_~	_0.065s	_0.080s	_{p=0.897 n=12}
_{Check Time}	_{1.953s (± 0.29%)}	_{1.878s (± 0.40%)}	_{🟩-0.074s (- 3.82%)}	_1.854s	_1.895s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{2.373s (± 0.50%)}	_{2.302s (± 0.55%)}	_{-0.071s (- 2.98%)}	_2.280s	_2.343s	_{p=0.000 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,062,854	_1,062,854	_~	_~	_~	_{p=1.000 n=12}
_Types	_390,845	_390,845	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{472,425k (± 0.04%)}	_{434,137k (± 0.02%)}	_{🟩-38,288k (- 8.10%)}	_433,890k	_434,373k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,228,361 (± 0.09%)}	_{4,250,806 (± 0.07%)}	_{+22,444 (+ 0.53%)}	_4,241,973	_4,259,903	_{p=0.000 n=12}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.103s (± 2.19%)}	_{0.115s (± 2.65%)}	_{🔻+0.011s (+11.03%)}	_0.108s	_0.122s	_{p=0.000 n=12}
_{Bind Time}	_{0.039s (±15.90%)}	_{0.029s (±14.67%)}	_{🟩-0.010s (-25.91%)}	_0.025s	_0.047s	_{p=0.001 n=12}
_{Check Time}	_{0.827s (± 0.99%)}	_{0.806s (± 1.27%)}	_{-0.021s (- 2.51%)}	_0.786s	_0.842s	_{p=0.002 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.978s (± 1.16%)}	_{0.958s (± 1.18%)}	_{-0.020s (- 2.08%)}	_0.935s	_0.991s	_{p=0.014 n=12}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
mui-docs - native
strada-build-src - native
strada-compiler - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

Developer Information:

Download Benchmarks

Symbols should share canonical names so identity checks and symbol-table lookups do not repeatedly compare string contents. Preserve textual behavior for diagnostics, emitted output, and the JavaScript API.

Known names and intermediate name operations should stay interned; repeated interning and string round trips defeat the canonical representation in frequently used lookup paths.

Symbol names need their own constructor and representation boundary, without exposing generic string handles throughout the compiler. Give name serialization a lossless escaped spelling and distinguish unset names from valid empty names.

unique.Make registers a weak handle for every new string, which made binding substantially slower and added allocations. Canonical names do not need to be collected during a compilation, so a dedicated table can make interning cheap. Identifying names by a 32-bit ID also keeps them free of pointers, so the symbol tables, nodes, and caches that store them cost the garbage collector nothing to scan or write-barrier.

Binding, checking, and language features reinterned identifier text at every symbol-table lookup, so interning cost was paid many times per identifier and showed up as a large binding regression. Interning once when the identifier is created lets every later lookup use the stored name directly. The AST schema gains a SymbolName field type so the generated Go AST and encoder carry the interned name while the JavaScript API still sees a plain string.

Most identifiers in a file repeat a small set of names, and going to the shared intern table for each one makes parsing noticeably slower, especially when many files are parsed in parallel. A small per-parser cache resolves repeated names without touching shared state.

Interning every identifier at parse time hashes its text, but the scanner has just walked the same bytes. Hashing while scanning saves a second pass over each identifier in the parser's hottest path. │ sec/op │ sec/op vs base │ Parse/empty.ts-20 610.1n ± 2% 610.2n ± 1% ~ (p=0.767 n=12) Parse/checker.ts-20 46.61m ± 3% 45.68m ± 3% -1.99% (p=0.005 n=12) Parse/dom.generated.d.ts-20 16.71m ± 2% 16.53m ± 3% ~ (p=0.178 n=12) Parse/Herebyfile.mjs-20 786.8µ ± 2% 779.4µ ± 1% ~ (p=0.319 n=12) Parse/jsxComplexSignatureHasApplicabilityError.tsx-20 218.6µ ± 2% 213.3µ ± 2% -2.41% (p=0.012 n=12) geomean 606.0µ 598.2µ -1.29%

Jake Bailey (jakebailey) · 2026-10-27T18:47:03Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-10-27T18:47:10Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this faster`	✅ Started	👀 Results

typescript-automation · 2026-10-27T19:23:33Z

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

Provisional hosted-runner results: these VMs are not the dedicated benchmark machines. Results may be noisier and are not comparable to the historical series. For comparisons, both revisions of each scenario ran on the same VM.

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=12}
_Types	_79,607	_79,607	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{107,853k (± 0.09%)}	_{104,511k (± 0.05%)}	_{🟩-3,342k (- 3.10%)}	_104,426k	_104,667k	_{p=0.000 n=12}
_{Memory Allocs}	_{2,196,935 (± 0.01%)}	_{2,204,419 (± 0.01%)}	_{+7,485 (+ 0.34%)}	_2,204,056	_2,204,821	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.032s (± 2.62%)}	_{0.034s (± 3.26%)}	_{🔻+0.003s (+ 9.26%)}	_0.032s	_0.037s	_{p=0.000 n=12}
_{Bind Time}	_{0.011s (± 5.97%)}	_{0.011s (± 4.84%)}	_~	_0.010s	_0.013s	_{p=0.439 n=12}
_{Check Time}	_{0.335s (± 0.74%)}	_{0.330s (± 0.63%)}	_{-0.005s (- 1.49%)}	_0.326s	_0.336s	_{p=0.004 n=12}
_{Emit Time}	_{0.209s (± 1.41%)}	_{0.207s (± 1.83%)}	_~	_0.195s	_0.216s	_{p=0.898 n=12}
_{Total Time}	_{0.592s (± 0.69%)}	_{0.588s (± 0.78%)}	_~	_0.574s	_0.600s	_{p=0.138 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{586,506 (± 0.02%)}	_{586,509 (± 0.02%)}	_~	_586,332	_586,753	_{p=0.787 n=12}
_Types	_{241,692 (± 0.00%)}	_{241,692 (± 0.00%)}	_~	_241,690	_241,693	_{p=0.808 n=12}
_{Memory Used}	_{551,145k (± 0.02%)}	_{525,044k (± 0.03%)}	_{🟩-26,101k (- 4.74%)}	_524,749k	_525,483k	_{p=0.000 n=12}
_{Memory Allocs}	_{13,075,392 (± 0.08%)}	_{13,102,188 (± 0.01%)}	_{+26,795 (+ 0.20%)}	_13,097,921	_13,106,951	_{p=0.000 n=12}
_{Config Time}	_{0.017s (± 1.91%)}	_{0.017s (± 2.83%)}	_~	_0.016s	_0.018s	_{p=0.433 n=12}
_{Parse Time}	_{0.187s (± 2.53%)}	_{0.198s (± 2.79%)}	_{🔻+0.011s (+ 5.69%)}	_0.187s	_0.216s	_{p=0.006 n=12}
_{Bind Time}	_{0.058s (±12.49%)}	_{0.058s (±12.14%)}	_~	_0.049s	_0.081s	_{p=0.252 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.184s (± 1.08%)}	_{1.131s (± 1.98%)}	_{🟩-0.053s (- 4.47%)}	_1.087s	_1.211s	_{p=0.001 n=12}
_{Total Time}	_{1.459s (± 0.70%)}	_{1.419s (± 1.28%)}	_{-0.040s (- 2.73%)}	_1.382s	_1.485s	_{p=0.001 n=12}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_685,943	_685,943	_~	_~	_~	_{p=1.000 n=12}
_Types	_939,490	_939,490	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{532,496k (± 0.01%)}	_{505,231k (± 0.02%)}	_{🟩-27,265k (- 5.12%)}	_504,992k	_505,490k	_{p=0.000 n=12}
_{Memory Allocs}	_{12,771,085 (± 0.01%)}	_{12,790,959 (± 0.01%)}	_{+19,874 (+ 0.16%)}	_12,787,982	_12,796,340	_{p=0.000 n=12}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.058s (± 4.65%)}	_{0.062s (± 4.80%)}	_~	_0.056s	_0.071s	_{p=0.100 n=12}
_{Bind Time}	_{0.019s (±11.13%)}	_{0.018s (± 6.73%)}	_~	_0.016s	_0.022s	_{p=0.204 n=12}
_{Check Time}	_{1.370s (± 0.48%)}	_{1.361s (± 0.67%)}	_{-0.010s (- 0.70%)}	_1.342s	_1.399s	_{p=0.031 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.490s (± 0.69%)}	_{1.480s (± 0.55%)}	_~	_1.463s	_1.510s	_{p=0.155 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_3,784,027	_3,784,027	_~	_~	_~	_{p=1.000 n=12}
_Types	_1,355,982	_1,355,982	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,198,656k (± 0.09%)}	_{1,964,084k (± 0.06%)}	_{🟩-234,572k (-10.67%)}	_1,960,757k	_1,967,363k	_{p=0.000 n=12}
_{Memory Allocs}	_{26,481,438 (± 0.07%)}	_{26,470,668 (± 0.07%)}	_~	_26,439,521	_26,527,980	_{p=0.347 n=12}
_{Config Time}	_{0.014s (± 2.00%)}	_{0.014s (± 1.29%)}	_~	_0.014s	_0.015s	_{p=0.590 n=12}
_{Parse Time}	_{0.509s (± 4.14%)}	_{0.509s (± 3.45%)}	_~	_0.448s	_0.556s	_{p=1.000 n=12}
_{Bind Time}	_{0.001s (±23.23%)}	_{0.001s (±23.23%)}	_~	_0.001s	_0.002s	_{p=1.000 n=12}
_{Check Time}	_{4.942s (± 1.14%)}	_{4.224s (± 0.30%)}	_{🟩-0.718s (-14.53%)}	_4.181s	_4.264s	_{p=0.000 n=12}
_{Emit Time}	_{0.380s (± 5.23%)}	_{0.411s (± 5.04%)}	_~	_0.382s	_0.468s	_{p=0.192 n=12}
_{Total Time}	_{6.660s (± 0.78%)}	_{5.951s (± 0.57%)}	_{🟩-0.709s (-10.65%)}	_5.869s	_6.026s	_{p=0.000 n=12}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,793,249	_4,793,249	_~	_~	_~	_{p=1.000 n=12}
_Types	_2,607,051	_2,607,051	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{3,204,868k (± 0.05%)}	_{2,994,605k (± 0.04%)}	_{🟩-210,263k (- 6.56%)}	_2,992,379k	_2,997,793k	_{p=0.000 n=12}
_{Memory Allocs}	_{75,280,520 (± 0.07%)}	_{75,192,112 (± 0.13%)}	_~	_75,038,578	_75,567,371	_{p=0.068 n=12}
_{Config Time}	_{0.044s (± 0.64%)}	_{0.044s (± 0.73%)}	_~	_0.044s	_0.045s	_{p=0.667 n=12}
_{Parse Time}	_{0.705s (± 2.74%)}	_{0.770s (± 3.66%)}	_{🔻+0.065s (+ 9.24%)}	_0.712s	_0.860s	_{p=0.000 n=12}
_{Bind Time}	_{0.208s (±12.61%)}	_{0.216s (±13.94%)}	_~	_0.162s	_0.283s	_{p=0.832 n=12}
_{Check Time}	_{9.296s (± 0.58%)}	_{8.992s (± 0.79%)}	_{🟩-0.304s (- 3.27%)}	_8.877s	_9.276s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{10.312s (± 0.53%)}	_{10.086s (± 0.81%)}	_{-0.226s (- 2.19%)}	_9.889s	_10.305s	_{p=0.000 n=12}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,883,075	_1,883,075	_~	_~	_~	_{p=1.000 n=12}
_Types	_1,158,171	_1,158,171	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,056,372k (± 0.02%)}	_{998,181k (± 0.02%)}	_{🟩-58,191k (- 5.51%)}	_997,726k	_998,957k	_{p=0.000 n=12}
_{Memory Allocs}	_{13,547,818 (± 0.09%)}	_{13,580,518 (± 0.15%)}	_{+32,701 (+ 0.24%)}	_13,539,027	_13,634,392	_{p=0.005 n=12}
_{Config Time}	_{0.015s (± 3.34%)}	_{0.015s (± 1.93%)}	_~	_0.014s	_0.015s	_{p=1.000 n=12}
_{Parse Time}	_{0.242s (± 1.99%)}	_{0.262s (± 3.70%)}	_{🔻+0.020s (+ 8.08%)}	_0.239s	_0.286s	_{p=0.001 n=12}
_{Bind Time}	_{0.061s (±14.16%)}	_{0.055s (±12.13%)}	_~	_0.046s	_0.079s	_{p=0.212 n=12}
_{Check Time}	_{2.174s (± 0.39%)}	_{2.117s (± 0.53%)}	_{-0.056s (- 2.60%)}	_2.093s	_2.145s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{2.514s (± 0.60%)}	_{2.468s (± 0.57%)}	_{-0.046s (- 1.81%)}	_2.428s	_2.503s	_{p=0.000 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,184,976	_1,184,976	_~	_~	_~	_{p=1.000 n=12}
_Types	_438,967	_438,967	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,258,898k (± 0.21%)}	_{1,189,716k (± 0.12%)}	_{🟩-69,181k (- 5.50%)}	_1,184,788k	_1,191,926k	_{p=0.000 n=12}
_{Memory Allocs}	_{76,965,702 (± 0.18%)}	_{76,877,694 (± 0.01%)}	_~	_76,856,248	_76,922,588	_{p=0.478 n=12}
_{Config Time}	_{0.004s (± 9.48%)}	_{0.008s (±14.56%)}	_{🔻+0.004s (+97.92%)}	_0.005s	_0.011s	_{p=0.000 n=12}
_{Parse Time}	_{0.182s (± 1.90%)}	_{0.201s (± 2.59%)}	_{🔻+0.019s (+10.60%)}	_0.188s	_0.220s	_{p=0.000 n=12}
_{Bind Time}	_0.000s	_{0.000s (±217.90%)}	_~	_0.000s	_0.001s	_{p=1.000 n=12}
_{Check Time}	_{1.179s (± 0.45%)}	_{1.154s (± 0.28%)}	_{-0.025s (- 2.12%)}	_1.144s	_1.166s	_{p=0.000 n=12}
_{Emit Time}	_{0.213s (± 2.88%)}	_{0.200s (± 0.86%)}	_{🟩-0.013s (- 5.99%)}	_0.196s	_0.205s	_{p=0.000 n=12}
_{Total Time}	_{13.923s (± 0.58%)}	_{13.823s (± 0.55%)}	_~	_13.572s	_13.987s	_{p=0.081 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_263,513	_263,513	_~	_~	_~	_{p=1.000 n=12}
_Types	_196,118	_196,118	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{236,110k (± 0.03%)}	_{226,677k (± 0.02%)}	_{🟩-9,434k (- 4.00%)}	_226,538k	_226,812k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,287,553 (± 0.01%)}	_{4,305,632 (± 0.01%)}	_{+18,080 (+ 0.42%)}	_4,304,328	_4,307,081	_{p=0.000 n=12}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.073s (± 3.98%)}	_{0.086s (± 4.60%)}	_{🔻+0.013s (+17.27%)}	_0.076s	_0.096s	_{p=0.000 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{0.634s (± 0.80%)}	_{0.618s (± 0.66%)}	_{-0.015s (- 2.43%)}	_0.610s	_0.629s	_{p=0.000 n=12}
_{Emit Time}	_{0.101s (± 2.27%)}	_{0.097s (± 3.18%)}	_~	_0.089s	_0.107s	_{p=0.086 n=12}
_{Total Time}	_{0.847s (± 0.89%)}	_{0.839s (± 0.71%)}	_~	_0.828s	_0.857s	_{p=0.070 n=12}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,350,705	_4,350,705	_~	_~	_~	_{p=1.000 n=12}
_Types	_3,040,691	_3,040,691	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,609,766k (± 0.03%)}	_{2,493,633k (± 0.03%)}	_{🟩-116,133k (- 4.45%)}	_2,492,512k	_2,495,860k	_{p=0.000 n=12}
_{Memory Allocs}	_{37,327,195 (± 0.07%)}	_{37,294,324 (± 0.04%)}	_{-32,871 (- 0.09%)}	_37,265,752	_37,325,736	_{p=0.039 n=12}
_{Config Time}	_{0.006s (± 3.97%)}	_{0.006s (± 4.55%)}	_~	_0.006s	_0.007s	_{p=1.000 n=12}
_{Parse Time}	_{0.454s (± 1.83%)}	_{0.463s (± 2.41%)}	_~	_0.433s	_0.497s	_{p=0.193 n=12}
_{Bind Time}	_{0.159s (± 9.68%)}	_{0.160s (±10.00%)}	_~	_0.130s	_0.197s	_{p=0.810 n=12}
_{Check Time}	_{13.214s (± 0.56%)}	_{13.286s (± 0.42%)}	_~	_13.181s	_13.460s	_{p=0.060 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{13.850s (± 0.53%)}	_{13.933s (± 0.40%)}	_{+0.082s (+ 0.59%)}	_13.836s	_14.072s	_{p=0.035 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_231,617	_231,617	_~	_~	_~	_{p=1.000 n=12}
_Types	_181,196	_181,196	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{203,349k (± 0.01%)}	_{195,183k (± 0.01%)}	_{🟩-8,166k (- 4.02%)}	_195,111k	_195,290k	_{p=0.000 n=12}
_{Memory Allocs}	_{1,358,076 (± 0.01%)}	_{1,374,003 (± 0.02%)}	_{+15,928 (+ 1.17%)}	_1,373,445	_1,374,652	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.065s (± 3.80%)}	_{0.069s (± 4.10%)}	_{🔻+0.004s (+ 6.41%)}	_0.061s	_0.076s	_{p=0.034 n=12}
_{Bind Time}	_{0.028s (± 5.21%)}	_{0.027s (± 6.34%)}	_~	_0.023s	_0.032s	_{p=0.081 n=12}
_{Check Time}	_{0.456s (± 0.93%)}	_{0.447s (± 1.00%)}	_{-0.009s (- 1.97%)}	_0.440s	_0.465s	_{p=0.001 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.560s (± 1.11%)}	_{0.552s (± 0.51%)}	_{-0.008s (- 1.40%)}	_0.548s	_0.560s	_{p=0.018 n=12}
_{vscode - native}
_Errors	₁₀	₁₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_7,287,110	_7,287,110	_~	_~	_~	_{p=1.000 n=12}
_Types	_4,289,787	_4,289,787	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{5,410,835k (± 0.03%)}	_{5,127,908k (± 0.02%)}	_{🟩-282,927k (- 5.23%)}	_5,126,030k	_5,131,041k	_{p=0.000 n=12}
_{Memory Allocs}	_{62,639,518 (± 0.01%)}	_{62,670,880 (± 0.02%)}	_{+31,362 (+ 0.05%)}	_62,652,098	_62,717,843	_{p=0.000 n=12}
_{Config Time}	_{0.068s (± 0.60%)}	_{0.068s (± 0.83%)}	_~	_0.067s	_0.070s	_{p=0.479 n=12}
_{Parse Time}	_{1.277s (± 1.76%)}	_{1.376s (± 2.78%)}	_{🔻+0.099s (+ 7.73%)}	_1.319s	_1.528s	_{p=0.000 n=12}
_{Bind Time}	_{0.426s (±10.46%)}	_{0.394s (± 7.97%)}	_{🟩-0.032s (- 7.42%)}	_0.353s	_0.529s	_{p=0.003 n=12}
_{Check Time}	_{11.432s (± 0.40%)}	_{11.406s (± 0.65%)}	_~	_11.239s	_11.703s	_{p=0.443 n=12}
_{Emit Time}	_{3.903s (± 4.72%)}	_{3.923s (± 4.87%)}	_~	_3.555s	_4.378s	_{p=0.920 n=12}
_{Total Time}	_{17.177s (± 1.11%)}	_{17.239s (± 1.12%)}	_~	_16.869s	_17.756s	_{p=0.641 n=12}
_{webpack - native}
_Errors	₆₁₉	₆₁₉	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_916,787	_916,787	_~	_~	_~	_{p=1.000 n=12}
_Types	_636,816	_636,816	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{742,328k (± 0.02%)}	_{707,441k (± 0.02%)}	_{🟩-34,888k (- 4.70%)}	_707,176k	_707,909k	_{p=0.000 n=12}
_{Memory Allocs}	_{6,528,238 (± 0.01%)}	_{6,561,273 (± 0.01%)}	_{+33,035 (+ 0.51%)}	_6,559,269	_6,562,743	_{p=0.000 n=12}
_{Config Time}	_{0.007s (± 3.42%)}	_0.007s	_~	_~	_~	_{p=0.478 n=12}
_{Parse Time}	_{0.201s (± 3.80%)}	_{0.219s (± 3.75%)}	_{🔻+0.018s (+ 9.01%)}	_0.201s	_0.242s	_{p=0.004 n=12}
_{Bind Time}	_{0.067s (±13.37%)}	_{0.069s (±12.88%)}	_~	_0.051s	_0.090s	_{p=1.000 n=12}
_{Check Time}	_{1.525s (± 0.58%)}	_{1.498s (± 0.43%)}	_{-0.027s (- 1.80%)}	_1.479s	_1.512s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.842s (± 0.58%)}	_{1.829s (± 0.73%)}	_~	_1.793s	_1.862s	_{p=0.193 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_640,494	_640,494	_~	_~	_~	_{p=1.000 n=12}
_Types	_387,992	_387,992	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{386,584k (± 0.02%)}	_{364,286k (± 0.04%)}	_{🟩-22,298k (- 5.77%)}	_364,037k	_364,922k	_{p=0.000 n=12}
_{Memory Allocs}	_{3,991,311 (± 0.08%)}	_{4,017,504 (± 0.07%)}	_{+26,194 (+ 0.66%)}	_4,008,393	_4,023,916	_{p=0.000 n=12}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.089s (± 2.93%)}	_{0.096s (± 3.25%)}	_{🔻+0.006s (+ 7.20%)}	_0.087s	_0.106s	_{p=0.003 n=12}
_{Bind Time}	_{0.027s (± 9.71%)}	_{0.026s (±11.77%)}	_~	_0.021s	_0.034s	_{p=0.232 n=12}
_{Check Time}	_{0.617s (± 0.67%)}	_{0.605s (± 0.78%)}	_{-0.012s (- 2.02%)}	_0.593s	_0.620s	_{p=0.001 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.743s (± 0.72%)}	_{0.735s (± 0.70%)}	_~	_0.719s	_0.751s	_{p=0.053 n=12}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
arktype - native
mui-docs - native
sentry - native
social-app - native
strada-build-src - native
strada-compiler - native
t3code-server - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

Developer Information:

Download Benchmarks

Jake Bailey (jakebailey) · 2026-10-27T20:33:58Z

Hmm, will have to see if that perf slowdown is still real (I thought it was fixed) and if it can be improved.

Interned IDs stay 32 bits, but every struct and map slot that holds a SymbolName aligns its neighbors to 8 bytes, so the 32-bit name was padded to 8 bytes anyway: Identifier.Text, symbolData.name, symbol table map slots, and the checker types that hold names all had a 4-byte hole after it. Widening the field costs nothing, and the spare bits leave room to encode names that never need to enter the table. tsc --extendedDiagnostics memory, median of 3 runs: 32-bit 64-bit self-build-src 224,394K 224,449K +0.02% xstate 268,337K 268,372K +0.01% mui-docs 1,761,690K 1,761,642K -0.00% vscode 2,829,089K 2,826,766K -0.08%

# Conflicts: # tsc/internal/api/session_symbolresponse_test.go # tsc/internal/ast/symbol.go # tsc/internal/ast/symbol_test.go # tsc/internal/binder/binder.go # tsc/internal/checker/checker.go # tsc/internal/checker/inference.go # tsc/internal/checker/nodebuilderimpl.go # tsc/internal/checker/services.go # tsc/internal/checker/symbolaccessibility.go # tsc/internal/checker/types_test.go # tsc/internal/checker/utilities.go # tsc/internal/ls/autoimport/extract.go # tsc/internal/printer/namegenerator.go # tsc/internal/transformers/declarations/transform.go

Jake Bailey (jakebailey) · 2026-10-28T14:10:39Z

TypeScript Bot (@typescript-bot) perf test this faster

testing 64 bit before another refactor

typescript-automation · 2026-10-28T14:10:45Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this faster`	✅ Started	👀 Results

typescript-automation · 2026-10-28T14:49:51Z

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=20}
_Types	_79,607	_79,607	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{104,144k (± 0.02%)}	_{102,395k (± 0.03%)}	_{-1,748k (- 1.68%)}	_102,271k	_102,511k	_{p=0.000 n=20}
_{Memory Allocs}	_{2,200,690 (± 0.01%)}	_{2,208,334 (± 0.00%)}	_{+7,645 (+ 0.35%)}	_2,208,028	_2,208,761	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.022s (± 2.82%)}	_{0.023s (± 1.87%)}	_{🔻+0.002s (+ 8.08%)}	_0.022s	_0.025s	_{p=0.000 n=20}
_{Bind Time}	_{0.009s (± 5.03%)}	_{0.008s (± 3.79%)}	_~	_0.007s	_0.009s	_{p=0.714 n=20}
_{Check Time}	_{0.225s (± 0.62%)}	_{0.216s (± 0.59%)}	_{🟩-0.009s (- 4.02%)}	_0.211s	_0.222s	_{p=0.000 n=20}
_{Emit Time}	_{0.153s (± 1.10%)}	_{0.153s (± 1.32%)}	_~	_0.147s	_0.160s	_{p=0.762 n=20}
_{Total Time}	_{0.412s (± 0.49%)}	_{0.404s (± 0.62%)}	_{-0.008s (- 1.89%)}	_0.395s	_0.412s	_{p=0.000 n=20}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_{586,572 (± 0.02%)}	_{586,533 (± 0.01%)}	_~	_586,255	_586,864	_{p=0.583 n=20}
_Types	_{241,692 (± 0.00%)}	_{241,693 (± 0.00%)}	_~	_241,690	_241,703	_{p=0.654 n=20}
_{Memory Used}	_{518,054k (± 0.02%)}	_{504,861k (± 0.01%)}	_{-13,193k (- 2.55%)}	_504,664k	_505,143k	_{p=0.000 n=20}
_{Memory Allocs}	_{13,119,563 (± 0.04%)}	_{13,149,687 (± 0.03%)}	_{+30,124 (+ 0.23%)}	_13,140,438	_13,171,224	_{p=0.000 n=20}
_{Config Time}	_{0.009s (± 7.96%)}	_{0.009s (± 2.18%)}	_~	_0.008s	_0.009s	_{p=0.301 n=20}
_{Parse Time}	_{0.137s (± 3.69%)}	_{0.144s (± 2.92%)}	_{🔻+0.007s (+ 5.30%)}	_0.122s	_0.165s	_{p=0.007 n=20}
_{Bind Time}	_{0.041s (± 2.57%)}	_{0.042s (± 9.52%)}	_{+0.001s (+ 2.59%)}	_0.036s	_0.064s	_{p=0.010 n=20}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=20}
_{Emit Time}	_{0.928s (± 1.01%)}	_{0.923s (± 1.27%)}	_~	_0.884s	_0.995s	_{p=0.448 n=20}
_{Total Time}	_{1.125s (± 1.05%)}	_{1.127s (± 1.02%)}	_~	_1.093s	_1.195s	_{p=0.984 n=20}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_685,943	_685,943	_~	_~	_~	_{p=1.000 n=20}
_Types	_939,490	_939,490	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{497,262k (± 0.01%)}	_{484,539k (± 0.01%)}	_{-12,724k (- 2.56%)}	_484,337k	_484,773k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,805,329 (± 0.01%)}	_{12,824,632 (± 0.01%)}	_{+19,303 (+ 0.15%)}	_12,820,569	_12,832,068	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.041s (± 2.84%)}	_{0.046s (± 4.06%)}	_{🔻+0.005s (+13.15%)}	_0.039s	_0.053s	_{p=0.000 n=20}
_{Bind Time}	_{0.013s (± 7.82%)}	_{0.012s (± 7.40%)}	_~	_0.011s	_0.019s	_{p=0.117 n=20}
_{Check Time}	_{0.998s (± 0.59%)}	_{0.991s (± 0.65%)}	_~	_0.963s	_1.009s	_{p=0.250 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.083s (± 0.48%)}	_{1.080s (± 0.53%)}	_~	_1.057s	_1.099s	_{p=0.551 n=20}
_{class-transformer - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_45,376	_45,376	_~	_~	_~	_{p=1.000 n=20}
_Types	_7,573	_7,573	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{27,841k (± 0.02%)}	_{27,370k (± 0.02%)}	_{-471k (- 1.69%)}	_27,350k	_27,387k	_{p=0.000 n=20}
_{Memory Allocs}	_{323,287 (± 0.02%)}	_{327,420 (± 0.05%)}	_{+4,133 (+ 1.28%)}	_326,934	_328,122	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.010s (± 4.91%)}	_{0.011s (± 4.92%)}	_~	_0.009s	_0.013s	_{p=0.175 n=20}
_{Bind Time}	_{0.003s (±12.84%)}	_{0.003s (±18.60%)}	_~	_0.002s	_0.006s	_{p=0.477 n=20}
_{Check Time}	_{0.009s (± 4.74%)}	_{0.008s (± 5.14%)}	_{🟩-0.001s (- 8.52%)}	_0.007s	_0.009s	_{p=0.009 n=20}
_{Emit Time}	_{0.010s (± 2.84%)}	_{0.010s (± 4.26%)}	_~	_0.008s	_0.011s	_{p=0.681 n=20}
_{Total Time}	_{0.033s (± 2.62%)}	_{0.033s (± 2.52%)}	_~	_0.030s	_0.038s	_{p=0.928 n=20}
_{effect - native}
_Errors	₁₂	₁₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,235,117	_1,235,117	_~	_~	_~	_{p=1.000 n=20}
_Types	_894,115	_894,115	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{940,460k (± 0.02%)}	_{919,792k (± 0.02%)}	_{-20,668k (- 2.20%)}	_919,068k	_920,638k	_{p=0.000 n=20}
_{Memory Allocs}	_{15,752,187 (± 0.02%)}	_{15,775,671 (± 0.02%)}	_{+23,484 (+ 0.15%)}	_15,759,019	_15,796,417	_{p=0.000 n=20}
_{Config Time}	_{0.002s (±16.30%)}	_{0.002s (± 9.93%)}	_~	_0.002s	_0.004s	_{p=0.744 n=20}
_{Parse Time}	_{0.161s (± 3.21%)}	_{0.171s (± 1.75%)}	_{🔻+0.010s (+ 5.96%)}	_0.159s	_0.187s	_{p=0.000 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{1.026s (± 1.49%)}	_{1.011s (± 1.06%)}	_~	_0.979s	_1.068s	_{p=0.080 n=20}
_{Emit Time}	_{0.559s (± 2.57%)}	_{0.549s (± 2.46%)}	_~	_0.516s	_0.637s	_{p=0.239 n=20}
_{Total Time}	_{1.855s (± 1.19%)}	_{1.832s (± 0.94%)}	_~	_1.776s	_1.907s	_{p=0.126 n=20}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_3,784,027	_3,784,027	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,355,982	_1,355,982	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,835,839k (± 0.08%)}	_{1,775,681k (± 0.08%)}	_{🟩-60,158k (- 3.28%)}	_1,770,772k	_1,781,474k	_{p=0.000 n=20}
_{Memory Allocs}	_{26,727,848 (± 0.06%)}	_{26,720,318 (± 0.05%)}	_~	_26,662,491	_26,764,219	_{p=0.512 n=20}
_{Config Time}	_0.008s	_0.008s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.280s (± 2.54%)}	_{0.303s (± 2.83%)}	_{🔻+0.023s (+ 8.03%)}	_0.266s	_0.339s	_{p=0.000 n=20}
_{Bind Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{3.226s (± 0.51%)}	_{2.918s (± 0.44%)}	_{🟩-0.308s (- 9.55%)}	_2.871s	_2.989s	_{p=0.000 n=20}
_{Emit Time}	_{0.243s (± 0.86%)}	_{0.246s (± 4.11%)}	_~	_0.233s	_0.335s	_{p=0.515 n=20}
_{Total Time}	_{4.232s (± 0.43%)}	_{3.949s (± 0.47%)}	_{🟩-0.283s (- 6.69%)}	_3.902s	_4.051s	_{p=0.000 n=20}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,793,249	_4,793,249	_~	_~	_~	_{p=1.000 n=20}
_Types	_2,607,051	_2,607,051	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,881,172k (± 0.03%)}	_{2,815,552k (± 0.05%)}	_{-65,619k (- 2.28%)}	_2,811,760k	_2,822,749k	_{p=0.000 n=20}
_{Memory Allocs}	_{75,916,021 (± 0.14%)}	_{75,866,961 (± 0.09%)}	_~	_75,603,703	_76,140,165	_{p=0.565 n=20}
_{Config Time}	_{0.027s (± 0.86%)}	_{0.027s (± 1.03%)}	_~	_0.026s	_0.028s	_{p=1.000 n=20}
_{Parse Time}	_{0.504s (± 6.22%)}	_{0.544s (± 4.93%)}	_{🔻+0.040s (+ 7.95%)}	_0.485s	_0.717s	_{p=0.004 n=20}
_{Bind Time}	_{0.165s (±10.11%)}	_{0.143s (± 6.43%)}	_~	_0.132s	_0.223s	_{p=0.111 n=20}
_{Check Time}	_{7.142s (± 0.45%)}	_{6.857s (± 0.67%)}	_{🟩-0.285s (- 3.98%)}	_6.750s	_7.069s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.893s (± 0.67%)}	_{7.622s (± 0.79%)}	_{🟩-0.270s (- 3.42%)}	_7.475s	_7.995s	_{p=0.000 n=20}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,883,075	_1,883,075	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,158,171	_1,158,171	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{972,400k (± 0.02%)}	_{951,400k (± 0.02%)}	_{-21,000k (- 2.16%)}	_950,935k	_952,161k	_{p=0.000 n=20}
_{Memory Allocs}	_{13,701,051 (± 0.09%)}	_{13,732,721 (± 0.21%)}	_~	_13,675,119	_13,916,353	_{p=0.076 n=20}
_{Config Time}	_{0.009s (±13.14%)}	_{0.008s (± 2.64%)}	_~	_0.008s	_0.009s	_{p=0.716 n=20}
_{Parse Time}	_{0.192s (± 4.03%)}	_{0.206s (± 2.84%)}	_{🔻+0.014s (+ 7.42%)}	_0.174s	_0.225s	_{p=0.002 n=20}
_{Bind Time}	_{0.047s (± 9.61%)}	_{0.045s (± 8.26%)}	_~	_0.036s	_0.069s	_{p=0.439 n=20}
_{Check Time}	_{1.831s (± 1.07%)}	_{1.779s (± 1.09%)}	_{-0.053s (- 2.88%)}	_1.714s	_1.851s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{2.100s (± 1.05%)}	_{2.056s (± 0.97%)}	_{-0.044s (- 2.11%)}	_1.987s	_2.132s	_{p=0.004 n=20}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,184,976	_1,184,976	_~	_~	_~	_{p=1.000 n=20}
_Types	_438,967	_438,967	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,177,906k (± 0.49%)}	_{1,150,454k (± 0.23%)}	_{-27,452k (- 2.33%)}	_1,139,001k	_1,158,287k	_{p=0.000 n=20}
_{Memory Allocs}	_{77,568,085 (± 0.11%)}	_{77,385,952 (± 0.06%)}	_{-182,133 (- 0.23%)}	_77,156,996	_77,579,635	_{p=0.000 n=20}
_{Config Time}	_{0.002s (±15.95%)}	_{0.004s (±12.34%)}	_{🔻+0.002s (+153.33%)}	_0.002s	_0.005s	_{p=0.000 n=20}
_{Parse Time}	_{0.146s (± 1.99%)}	_{0.159s (± 1.78%)}	_{🔻+0.013s (+ 9.04%)}	_0.147s	_0.171s	_{p=0.000 n=20}
_{Bind Time}	_0.000s	_{0.000s (±208.60%)}	_~	_0.000s	_0.002s	_{p=1.000 n=20}
_{Check Time}	_{0.881s (± 0.92%)}	_{0.829s (± 0.41%)}	_{🟩-0.051s (- 5.84%)}	_0.816s	_0.844s	_{p=0.000 n=20}
_{Emit Time}	_{0.181s (± 1.86%)}	_{0.171s (± 1.50%)}	_{🟩-0.010s (- 5.38%)}	_0.163s	_0.180s	_{p=0.000 n=20}
_{Total Time}	_{10.653s (± 0.90%)}	_{10.377s (± 0.39%)}	_{-0.276s (- 2.59%)}	_10.238s	_10.577s	_{p=0.000 n=20}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_263,513	_263,513	_~	_~	_~	_{p=1.000 n=20}
_Types	_196,118	_196,118	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{224,602k (± 0.01%)}	_{219,941k (± 0.02%)}	_{-4,662k (- 2.08%)}	_219,754k	_220,048k	_{p=0.000 n=20}
_{Memory Allocs}	_{4,304,349 (± 0.00%)}	_{4,322,463 (± 0.01%)}	_{+18,114 (+ 0.42%)}	_4,321,080	_4,323,378	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.052s (± 4.21%)}	_{0.058s (± 2.28%)}	_{🔻+0.006s (+11.92%)}	_0.053s	_0.063s	_{p=0.000 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.402s (± 0.74%)}	_{0.390s (± 0.80%)}	_{🟩-0.013s (- 3.19%)}	_0.378s	_0.404s	_{p=0.000 n=20}
_{Emit Time}	_{0.078s (± 2.07%)}	_{0.078s (± 2.29%)}	_~	_0.070s	_0.086s	_{p=0.835 n=20}
_{Total Time}	_{0.562s (± 0.57%)}	_{0.554s (± 0.67%)}	_{-0.009s (- 1.51%)}	_0.540s	_0.576s	_{p=0.000 n=20}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,350,705	_4,350,705	_~	_~	_~	_{p=1.000 n=20}
_Types	_3,040,691	_3,040,691	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,434,028k (± 0.03%)}	_{2,387,427k (± 0.03%)}	_{-46,601k (- 1.91%)}	_2,385,935k	_2,391,313k	_{p=0.000 n=20}
_{Memory Allocs}	_{37,882,259 (± 0.05%)}	_{37,860,566 (± 0.04%)}	_~	_37,820,036	_37,933,920	_{p=0.114 n=20}
_{Config Time}	_0.003s	_0.003s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.265s (± 2.13%)}	_{0.280s (± 1.30%)}	_{🔻+0.015s (+ 5.62%)}	_0.265s	_0.297s	_{p=0.000 n=20}
_{Bind Time}	_{0.089s (± 9.05%)}	_{0.084s (± 8.15%)}	_{🟩-0.004s (- 4.68%)}	_0.075s	_0.125s	_{p=0.027 n=20}
_{Check Time}	_{7.758s (± 0.51%)}	_{7.756s (± 0.67%)}	_~	_7.550s	_7.974s	_{p=0.846 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{8.126s (± 0.51%)}	_{8.135s (± 0.63%)}	_~	_7.917s	_8.344s	_{p=0.723 n=20}
_{tanstack-router - native}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_571,760	_571,760	_~	_~	_~	_{p=1.000 n=20}
_Types	_397,693	_397,693	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{331,435k (± 0.01%)}	_{323,532k (± 0.02%)}	_{-7,903k (- 2.38%)}	_323,355k	_323,708k	_{p=0.000 n=20}
_{Memory Allocs}	_{5,092,314 (± 0.05%)}	_{5,109,913 (± 0.11%)}	_{+17,599 (+ 0.35%)}	_5,102,335	_5,153,729	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.039s (± 3.15%)}	_{0.045s (± 2.83%)}	_{🔻+0.005s (+13.74%)}	_0.039s	_0.049s	_{p=0.000 n=20}
_{Bind Time}	_{0.012s (± 7.10%)}	_{0.012s (±10.76%)}	_~	_0.010s	_0.019s	_{p=0.374 n=20}
_{Check Time}	_{0.569s (± 0.59%)}	_{0.560s (± 0.73%)}	_{-0.008s (- 1.47%)}	_0.547s	_0.578s	_{p=0.001 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.647s (± 0.39%)}	_{0.641s (± 0.62%)}	_{-0.007s (- 1.07%)}	_0.623s	_0.655s	_{p=0.007 n=20}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_231,617	_231,617	_~	_~	_~	_{p=1.000 n=20}
_Types	_181,196	_181,196	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{193,528k (± 0.01%)}	_{189,431k (± 0.01%)}	_{-4,097k (- 2.12%)}	_189,323k	_189,510k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,373,287 (± 0.01%)}	_{1,388,782 (± 0.01%)}	_{+15,495 (+ 1.13%)}	_1,388,123	_1,389,346	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.046s (± 7.22%)}	_{0.049s (± 2.57%)}	_{🔻+0.003s (+ 6.43%)}	_0.044s	_0.054s	_{p=0.000 n=20}
_{Bind Time}	_{0.021s (± 7.56%)}	_{0.021s (± 3.83%)}	_~	_0.018s	_0.025s	_{p=0.352 n=20}
_{Check Time}	_{0.316s (± 2.08%)}	_{0.304s (± 1.94%)}	_{🟩-0.012s (- 3.76%)}	_0.291s	_0.346s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.391s (± 2.46%)}	_{0.381s (± 1.56%)}	_{-0.010s (- 2.55%)}	_0.364s	_0.419s	_{p=0.038 n=20}
_{vscode - native}
_Errors	₁₀	₁₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_7,346,337	_7,346,337	_~	_~	_~	_{p=1.000 n=20}
_Types	_4,341,889	_4,341,889	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{5,118,724k (± 0.01%)}	_{4,964,384k (± 0.02%)}	_{🟩-154,340k (- 3.02%)}	_4,961,895k	_4,968,016k	_{p=0.000 n=20}
_{Memory Allocs}	_{64,521,744 (± 0.02%)}	_{64,566,132 (± 0.01%)}	_{+44,388 (+ 0.07%)}	_64,539,382	_64,603,425	_{p=0.000 n=20}
_{Config Time}	_{0.036s (± 1.02%)}	_{0.036s (± 0.92%)}	_~	_0.035s	_0.038s	_{p=0.150 n=20}
_{Parse Time}	_{0.921s (± 1.54%)}	_{0.973s (± 3.16%)}	_{🔻+0.051s (+ 5.57%)}	_0.871s	_1.125s	_{p=0.010 n=20}
_{Bind Time}	_{0.303s (± 3.58%)}	_{0.357s (± 9.65%)}	_~	_0.281s	_0.482s	_{p=0.344 n=20}
_{Check Time}	_{8.064s (± 0.32%)}	_{7.882s (± 0.53%)}	_{-0.182s (- 2.26%)}	_7.747s	_8.000s	_{p=0.000 n=20}
_{Emit Time}	_{3.012s (± 3.41%)}	_{3.197s (± 5.34%)}	_~	_2.662s	_3.621s	_{p=0.262 n=20}
_{Total Time}	_{12.395s (± 0.77%)}	_{12.511s (± 1.13%)}	_~	_12.014s	_12.882s	_{p=0.516 n=20}
_{webpack - native}
_Errors	₆₁₉	₆₁₉	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_917,690	_917,690	_~	_~	_~	_{p=1.000 n=20}
_Types	_633,379	_633,379	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{690,232k (± 0.01%)}	_{674,769k (± 0.01%)}	_{-15,462k (- 2.24%)}	_674,354k	_675,081k	_{p=0.000 n=20}
_{Memory Allocs}	_{6,594,837 (± 0.02%)}	_{6,638,458 (± 0.11%)}	_{+43,621 (+ 0.66%)}	_6,625,930	_6,694,777	_{p=0.000 n=20}
_{Config Time}	_0.004s	_0.004s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.148s (± 4.26%)}	_{0.156s (± 3.43%)}	_~	_0.134s	_0.180s	_{p=0.233 n=20}
_{Bind Time}	_{0.049s (±10.95%)}	_{0.043s (± 6.19%)}	_~	_0.037s	_0.056s	_{p=0.111 n=20}
_{Check Time}	_{1.197s (± 0.49%)}	_{1.184s (± 0.58%)}	_{-0.013s (- 1.12%)}	_1.165s	_1.218s	_{p=0.002 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.424s (± 0.57%)}	_{1.410s (± 0.65%)}	_{-0.013s (- 0.94%)}	_1.378s	_1.460s	_{p=0.017 n=20}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_640,494	_640,494	_~	_~	_~	_{p=1.000 n=20}
_Types	_387,992	_387,992	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{350,965k (± 0.02%)}	_{342,771k (± 0.02%)}	_{-8,194k (- 2.33%)}	_342,555k	_343,073k	_{p=0.000 n=20}
_{Memory Allocs}	_{4,065,496 (± 0.08%)}	_{4,091,845 (± 0.08%)}	_{+26,349 (+ 0.65%)}	_4,076,657	_4,109,620	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.061s (± 2.36%)}	_{0.066s (± 2.91%)}	_{🔻+0.005s (+ 7.84%)}	_0.060s	_0.076s	_{p=0.000 n=20}
_{Bind Time}	_{0.022s (± 8.38%)}	_{0.019s (± 9.06%)}	_{🟩-0.003s (-15.06%)}	_0.017s	_0.033s	_{p=0.000 n=20}
_{Check Time}	_{0.434s (± 0.69%)}	_{0.417s (± 0.89%)}	_{🟩-0.017s (- 3.83%)}	_0.406s	_0.433s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.524s (± 0.81%)}	_{0.508s (± 0.83%)}	_{-0.016s (- 3.00%)}	_0.494s	_0.526s	_{p=0.000 n=20}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
arktype - native
class-transformer - native
effect - native
mui-docs - native
sentry - native
social-app - native
strada-build-src - native
strada-compiler - native
t3code-server - native
tanstack-router - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₂₀
_Baseline	_baseline	₂₀

Developer Information:

Download Benchmarks

Jake Bailey (jakebailey) · 2026-10-28T16:30:33Z

So, this makes it look like 64 bit is worse, but it's actually not; the delta just got smaller because the symbol table layout change did most of the work that this PR did to reduce the memory requirements of tables.

If changed back to 32, nothing changes.

The checker and binder synthesize names with unbounded numeric parts: private names, unique ES symbols, module patterns, and the "(auto@N)"/"(generated@N)" names. Interning each of these grows the table without bound in a long-lived process, since interned names are never freed. The spare bits of the 64-bit SymbolName can hold them directly instead: a 3-bit kind, a 35-bit number, and the 26-bit ID of the interned base text. These names are never interned, and two names are equal exactly when their texts are equal, because MakeSymbolName parses derived-shaped text back into its derived form. Interned text that starts with the internal "\xFE" prefix is tagged with its own kind, and records the byte after the prefix. This makes IsInternal, IsPrivateName, IsLateBoundName and IsReservedMemberName bit tests rather than lookups of the text. The fixed names are now iota constants generated from a single list (npx hereby generate:symbolnames), so they are compile-time constants and are seeded into the table in order. The zero value is the empty name, so an unset SymbolName needs no special handling, and String is the only way to get the text.

Jake Bailey (jakebailey) · 2026-10-28T16:34:51Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-10-28T16:34:57Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this faster`	✅ Started	❌ Results

typescript-automation · 2026-10-28T17:33:44Z

Jake Bailey (@jakebailey), the perf run you requested failed. You can check the log here.

Jake Bailey (jakebailey) · 2026-10-28T18:04:29Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-10-28T18:04:35Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this faster`	✅ Started	👀 Results

Jake Bailey (jakebailey) · 2026-10-28T18:15:36Z

+//
+//	bits 61-63: kind (0 for plain interned names)
+//	bits 26-60: number
+//	bits  0-25: interned ID of the base text (always an interned name)


I need to think harder about this; basically this means names are only 26 bits which is even worse than 32! Need to decide on a tradeoff

typescript-automation · 2026-10-28T18:59:42Z

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=20}
_Types	_79,607	_79,607	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{104,176k (± 0.02%)}	_{102,389k (± 0.03%)}	_{-1,787k (- 1.72%)}	_102,267k	_102,512k	_{p=0.000 n=20}
_{Memory Allocs}	_{2,200,777 (± 0.00%)}	_{2,161,811 (± 0.01%)}	_{-38,966 (- 1.77%)}	_2,161,404	_2,162,295	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.023s (± 2.56%)}	_{0.025s (± 2.49%)}	_{🔻+0.002s (+ 9.33%)}	_0.022s	_0.027s	_{p=0.000 n=20}
_{Bind Time}	_{0.009s (± 3.80%)}	_{0.009s (± 4.84%)}	_{🟩-0.001s (- 6.56%)}	_0.007s	_0.010s	_{p=0.044 n=20}
_{Check Time}	_{0.236s (± 0.66%)}	_{0.230s (± 0.64%)}	_{-0.006s (- 2.62%)}	_0.225s	_0.236s	_{p=0.000 n=20}
_{Emit Time}	_{0.162s (± 0.96%)}	_{0.159s (± 0.99%)}	_{-0.004s (- 2.25%)}	_0.154s	_0.165s	_{p=0.002 n=20}
_{Total Time}	_{0.434s (± 0.50%)}	_{0.425s (± 0.37%)}	_{-0.009s (- 2.00%)}	_0.418s	_0.431s	_{p=0.000 n=20}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_{586,580 (± 0.01%)}	_{586,522 (± 0.02%)}	_~	_585,890	_586,823	_{p=0.351 n=20}
_Types	_{241,692 (± 0.00%)}	_{241,694 (± 0.00%)}	_~	_241,690	_241,708	_{p=0.204 n=20}
_{Memory Used}	_{517,979k (± 0.01%)}	_{504,780k (± 0.02%)}	_{-13,199k (- 2.55%)}	_504,455k	_505,172k	_{p=0.000 n=20}
_{Memory Allocs}	_{13,114,775 (± 0.02%)}	_{13,151,243 (± 0.06%)}	_{+36,468 (+ 0.28%)}	_13,137,217	_13,214,179	_{p=0.000 n=20}
_{Config Time}	_{0.009s (± 1.87%)}	_{0.009s (± 1.58%)}	_~	_0.009s	_0.010s	_{p=1.000 n=20}
_{Parse Time}	_{0.138s (± 4.22%)}	_{0.155s (± 3.35%)}	_{🔻+0.017s (+12.65%)}	_0.140s	_0.180s	_{p=0.000 n=20}
_{Bind Time}	_{0.043s (± 6.50%)}	_{0.041s (± 8.80%)}	_{🟩-0.002s (- 3.86%)}	_0.035s	_0.065s	_{p=0.005 n=20}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=20}
_{Emit Time}	_{0.945s (± 0.97%)}	_{0.925s (± 1.07%)}	_{-0.020s (- 2.10%)}	_0.890s	_0.979s	_{p=0.003 n=20}
_{Total Time}	_{1.146s (± 0.99%)}	_{1.140s (± 0.74%)}	_~	_1.109s	_1.181s	_{p=0.402 n=20}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_685,943	_685,943	_~	_~	_~	_{p=1.000 n=20}
_Types	_939,490	_939,490	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{497,318k (± 0.01%)}	_{484,541k (± 0.01%)}	_{-12,777k (- 2.57%)}	_484,367k	_484,822k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,805,015 (± 0.02%)}	_{12,825,356 (± 0.01%)}	_{+20,342 (+ 0.16%)}	_12,820,163	_12,831,892	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.044s (± 4.16%)}	_{0.050s (± 5.46%)}	_{🔻+0.006s (+13.12%)}	_0.044s	_0.065s	_{p=0.001 n=20}
_{Bind Time}	_{0.014s (± 6.33%)}	_{0.015s (±20.20%)}	_~	_0.012s	_0.038s	_{p=0.799 n=20}
_{Check Time}	_{1.056s (± 1.06%)}	_{1.065s (± 1.55%)}	_~	_1.009s	_1.127s	_{p=0.410 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.145s (± 1.10%)}	_{1.163s (± 1.45%)}	_~	_1.108s	_1.245s	_{p=0.113 n=20}
_{class-transformer - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_45,376	_45,376	_~	_~	_~	_{p=1.000 n=20}
_Types	_7,573	_7,573	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{27,834k (± 0.02%)}	_{27,371k (± 0.03%)}	_{-463k (- 1.66%)}	_27,344k	_27,399k	_{p=0.000 n=20}
_{Memory Allocs}	_{323,462 (± 0.04%)}	_{325,937 (± 0.04%)}	_{+2,475 (+ 0.77%)}	_325,383	_326,592	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.011s (± 3.52%)}	_{0.012s (± 2.69%)}	_{🔻+0.001s (+ 6.39%)}	_0.011s	_0.013s	_{p=0.011 n=20}
_{Bind Time}	_{0.004s (± 9.52%)}	_{0.003s (±10.28%)}	_~	_0.002s	_0.005s	_{p=0.120 n=20}
_{Check Time}	_{0.009s (± 5.58%)}	_{0.009s (± 6.78%)}	_~	_0.007s	_0.010s	_{p=0.170 n=20}
_{Emit Time}	_{0.011s (± 4.68%)}	_{0.011s (± 3.92%)}	_~	_0.009s	_0.012s	_{p=0.243 n=20}
_{Total Time}	_{0.035s (± 1.59%)}	_{0.035s (± 1.61%)}	_~	_0.032s	_0.037s	_{p=0.887 n=20}
_{effect - native}
_Errors	₁₂	₁₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,235,117	_1,235,117	_~	_~	_~	_{p=1.000 n=20}
_Types	_894,115	_894,115	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{940,520k (± 0.02%)}	_{919,836k (± 0.02%)}	_{-20,684k (- 2.20%)}	_919,309k	_920,677k	_{p=0.000 n=20}
_{Memory Allocs}	_{15,753,229 (± 0.01%)}	_{15,784,723 (± 0.06%)}	_{+31,495 (+ 0.20%)}	_15,766,518	_15,834,443	_{p=0.000 n=20}
_{Config Time}	_{0.002s (± 5.09%)}	_{0.002s (± 5.09%)}	_~	_0.002s	_0.003s	_{p=1.000 n=20}
_{Parse Time}	_{0.169s (± 2.37%)}	_{0.182s (± 4.48%)}	_{🔻+0.013s (+ 7.91%)}	_0.165s	_0.242s	_{p=0.002 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{1.037s (± 0.79%)}	_{1.022s (± 1.18%)}	_{-0.014s (- 1.39%)}	_0.988s	_1.082s	_{p=0.018 n=20}
_{Emit Time}	_{0.566s (± 1.72%)}	_{0.568s (± 2.35%)}	_~	_0.513s	_0.642s	_{p=0.784 n=20}
_{Total Time}	_{1.876s (± 0.66%)}	_{1.875s (± 1.15%)}	_~	_1.810s	_1.997s	_{p=0.490 n=20}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_3,784,027	_3,784,027	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,355,982	_1,355,982	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,835,478k (± 0.08%)}	_{1,776,190k (± 0.06%)}	_{🟩-59,288k (- 3.23%)}	_1,771,831k	_1,781,450k	_{p=0.000 n=20}
_{Memory Allocs}	_{26,743,513 (± 0.08%)}	_{26,719,682 (± 0.06%)}	_~	_26,671,042	_26,793,807	_{p=0.096 n=20}
_{Config Time}	_{0.009s (± 1.93%)}	_{0.009s (± 2.82%)}	_{🟩-0.000s (- 3.95%)}	_0.008s	_0.009s	_{p=0.041 n=20}
_{Parse Time}	_{0.303s (± 2.65%)}	_{0.316s (± 2.33%)}	_{+0.012s (+ 3.99%)}	_0.283s	_0.342s	_{p=0.032 n=20}
_{Bind Time}	_{0.001s (±27.21%)}	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{3.391s (± 0.88%)}	_{3.028s (± 1.50%)}	_{🟩-0.363s (-10.70%)}	_2.874s	_3.158s	_{p=0.000 n=20}
_{Emit Time}	_{0.261s (± 1.37%)}	_{0.257s (± 1.71%)}	_{-0.005s (- 1.82%)}	_0.239s	_0.278s	_{p=0.035 n=20}
_{Total Time}	_{4.471s (± 0.99%)}	_{4.108s (± 1.31%)}	_{🟩-0.363s (- 8.12%)}	_3.908s	_4.259s	_{p=0.000 n=20}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,793,249	_4,793,249	_~	_~	_~	_{p=1.000 n=20}
_Types	_2,607,051	_2,607,051	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,881,749k (± 0.05%)}	_{2,816,128k (± 0.03%)}	_{-65,621k (- 2.28%)}	_2,812,334k	_2,820,848k	_{p=0.000 n=20}
_{Memory Allocs}	_{75,932,577 (± 0.07%)}	_{75,837,494 (± 0.06%)}	_{-95,084 (- 0.13%)}	_75,683,430	_76,086,028	_{p=0.009 n=20}
_{Config Time}	_{0.025s (± 0.69%)}	_{0.025s (± 2.05%)}	_~	_0.024s	_0.027s	_{p=0.621 n=20}
_{Parse Time}	_{0.477s (± 4.83%)}	_{0.540s (± 4.29%)}	_{🔻+0.063s (+13.22%)}	_0.495s	_0.666s	_{p=0.000 n=20}
_{Bind Time}	_{0.163s (± 9.68%)}	_{0.139s (± 4.83%)}	_{🟩-0.024s (-14.64%)}	_0.128s	_0.192s	_{p=0.004 n=20}
_{Check Time}	_{6.847s (± 0.42%)}	_{6.686s (± 1.29%)}	_{-0.162s (- 2.36%)}	_6.534s	_7.054s	_{p=0.005 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.566s (± 0.42%)}	_{7.438s (± 1.30%)}	_{-0.128s (- 1.69%)}	_7.234s	_7.831s	_{p=0.007 n=20}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,883,075	_1,883,075	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,158,171	_1,158,171	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{972,364k (± 0.01%)}	_{951,555k (± 0.02%)}	_{-20,809k (- 2.14%)}	_950,758k	_952,244k	_{p=0.000 n=20}
_{Memory Allocs}	_{13,717,697 (± 0.14%)}	_{13,716,028 (± 0.09%)}	_~	_13,673,053	_13,774,106	_{p=0.758 n=20}
_{Config Time}	_0.008s	_{0.008s (± 1.31%)}	_~	_0.007s	_0.008s	_{p=1.000 n=20}
_{Parse Time}	_{0.168s (± 4.59%)}	_{0.173s (± 2.78%)}	_{+0.006s (+ 3.52%)}	_0.161s	_0.202s	_{p=0.045 n=20}
_{Bind Time}	_{0.046s (±10.42%)}	_{0.042s (± 9.30%)}	_{🟩-0.004s (- 8.43%)}	_0.036s	_0.065s	_{p=0.024 n=20}
_{Check Time}	_{1.629s (± 1.00%)}	_{1.561s (± 1.18%)}	_{🟩-0.068s (- 4.15%)}	_1.520s	_1.679s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.869s (± 1.06%)}	_{1.802s (± 1.18%)}	_{🟩-0.068s (- 3.62%)}	_1.756s	_1.945s	_{p=0.000 n=20}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,184,976	_1,184,976	_~	_~	_~	_{p=1.000 n=20}
_Types	_438,967	_438,967	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,169,536k (± 0.31%)}	_{1,150,249k (± 0.24%)}	_{-19,287k (- 1.65%)}	_1,135,475k	_1,158,334k	_{p=0.000 n=20}
_{Memory Allocs}	_{77,398,635 (± 0.14%)}	_{77,349,594 (± 0.05%)}	_~	_77,156,504	_77,445,730	_{p=0.086 n=20}
_{Config Time}	_{0.002s (±14.47%)}	_{0.004s (±13.53%)}	_{🔻+0.002s (+102.56%)}	_0.002s	_0.006s	_{p=0.000 n=20}
_{Parse Time}	_{0.145s (± 1.02%)}	_{0.152s (± 1.05%)}	_{🔻+0.007s (+ 5.01%)}	_0.144s	_0.156s	_{p=0.000 n=20}
_{Bind Time}	_0.000s	_{0.000s (±208.60%)}	_~	_0.000s	_0.003s	_{p=1.000 n=20}
_{Check Time}	_{0.848s (± 0.50%)}	_{0.801s (± 0.35%)}	_{🟩-0.046s (- 5.48%)}	_0.792s	_0.812s	_{p=0.000 n=20}
_{Emit Time}	_{0.184s (± 1.97%)}	_{0.175s (± 1.26%)}	_{🟩-0.009s (- 4.67%)}	_0.165s	_0.182s	_{p=0.000 n=20}
_{Total Time}	_{10.325s (± 0.50%)}	_{10.062s (± 0.40%)}	_{-0.263s (- 2.55%)}	_9.912s	_10.245s	_{p=0.000 n=20}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_263,513	_263,513	_~	_~	_~	_{p=1.000 n=20}
_Types	_196,118	_196,118	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{224,610k (± 0.03%)}	_{219,895k (± 0.02%)}	_{-4,715k (- 2.10%)}	_219,700k	_220,022k	_{p=0.000 n=20}
_{Memory Allocs}	_{4,304,125 (± 0.00%)}	_{4,322,156 (± 0.01%)}	_{+18,032 (+ 0.42%)}	_4,320,571	_4,322,967	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.052s (± 1.98%)}	_{0.061s (± 2.37%)}	_{🔻+0.009s (+17.39%)}	_0.055s	_0.066s	_{p=0.000 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.419s (± 0.66%)}	_{0.410s (± 0.52%)}	_{-0.009s (- 2.04%)}	_0.402s	_0.418s	_{p=0.000 n=20}
_{Emit Time}	_{0.080s (± 2.29%)}	_{0.079s (± 2.42%)}	_~	_0.073s	_0.088s	_{p=0.206 n=20}
_{Total Time}	_{0.580s (± 0.60%)}	_{0.579s (± 0.56%)}	_~	_0.568s	_0.591s	_{p=0.569 n=20}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,350,705	_4,350,705	_~	_~	_~	_{p=1.000 n=20}
_Types	_3,040,691	_3,040,691	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,433,697k (± 0.03%)}	_{2,387,302k (± 0.03%)}	_{-46,394k (- 1.91%)}	_2,384,892k	_2,391,907k	_{p=0.000 n=20}
_{Memory Allocs}	_{37,884,968 (± 0.06%)}	_{37,858,107 (± 0.04%)}	_~	_37,809,996	_37,940,795	_{p=0.068 n=20}
_{Config Time}	_0.003s	_0.003s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.261s (± 1.77%)}	_{0.270s (± 2.09%)}	_{+0.009s (+ 3.33%)}	_0.253s	_0.295s	_{p=0.020 n=20}
_{Bind Time}	_{0.081s (± 3.78%)}	_{0.082s (± 8.16%)}	_{+0.001s (+ 1.30%)}	_0.071s	_0.119s	_{p=0.020 n=20}
_{Check Time}	_{7.597s (± 0.50%)}	_{7.587s (± 0.47%)}	_~	_7.486s	_7.723s	_{p=0.683 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.952s (± 0.50%)}	_{7.952s (± 0.46%)}	_~	_7.852s	_8.098s	_{p=0.984 n=20}
_{tanstack-router - native}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_571,760	_571,760	_~	_~	_~	_{p=1.000 n=20}
_Types	_397,693	_397,693	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{331,407k (± 0.01%)}	_{323,497k (± 0.01%)}	_{-7,910k (- 2.39%)}	_323,378k	_323,686k	_{p=0.000 n=20}
_{Memory Allocs}	_{5,092,300 (± 0.05%)}	_{5,118,243 (± 0.25%)}	_{+25,943 (+ 0.51%)}	_5,095,660	_5,205,729	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.044s (± 3.94%)}	_{0.050s (± 6.34%)}	_{🔻+0.006s (+12.78%)}	_0.039s	_0.071s	_{p=0.002 n=20}
_{Bind Time}	_{0.015s (±10.89%)}	_{0.014s (± 9.62%)}	_~	_0.011s	_0.022s	_{p=0.324 n=20}
_{Check Time}	_{0.625s (± 1.36%)}	_{0.619s (± 1.46%)}	_~	_0.589s	_0.660s	_{p=0.245 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.713s (± 1.20%)}	_{0.710s (± 1.57%)}	_~	_0.675s	_0.756s	_{p=0.664 n=20}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_231,617	_231,617	_~	_~	_~	_{p=1.000 n=20}
_Types	_181,196	_181,196	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{193,560k (± 0.02%)}	_{189,460k (± 0.01%)}	_{-4,100k (- 2.12%)}	_189,354k	_189,536k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,373,157 (± 0.01%)}	_{1,388,755 (± 0.01%)}	_{+15,598 (+ 1.14%)}	_1,388,135	_1,389,947	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.043s (± 2.75%)}	_{0.048s (± 2.05%)}	_{🔻+0.005s (+12.62%)}	_0.045s	_0.051s	_{p=0.000 n=20}
_{Bind Time}	_{0.021s (± 5.18%)}	_{0.020s (± 3.78%)}	_~	_0.017s	_0.023s	_{p=0.424 n=20}
_{Check Time}	_{0.304s (± 1.12%)}	_{0.301s (± 0.72%)}	_~	_0.290s	_0.310s	_{p=0.233 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.374s (± 0.76%)}	_{0.375s (± 0.66%)}	_~	_0.363s	_0.385s	_{p=0.783 n=20}
_{vscode - native}
_Errors	₁₀	₁₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_7,383,152	_7,383,152	_~	_~	_~	_{p=1.000 n=20}
_Types	_4,366,356	_4,366,356	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{5,133,189k (± 0.02%)}	_{4,977,603k (± 0.02%)}	_{🟩-155,586k (- 3.03%)}	_4,972,253k	_4,980,922k	_{p=0.000 n=20}
_{Memory Allocs}	_{64,775,613 (± 0.01%)}	_{64,784,592 (± 0.01%)}	_~	_64,747,833	_64,810,861	_{p=0.072 n=20}
_{Config Time}	_{0.037s (± 1.76%)}	_{0.036s (± 1.88%)}	_~	_0.034s	_0.039s	_{p=0.409 n=20}
_{Parse Time}	_{0.972s (± 3.04%)}	_{1.058s (± 4.31%)}	_{🔻+0.086s (+ 8.86%)}	_0.876s	_1.259s	_{p=0.005 n=20}
_{Bind Time}	_{0.373s (±10.82%)}	_{0.349s (± 7.99%)}	_~	_0.286s	_0.483s	_{p=0.163 n=20}
_{Check Time}	_{8.040s (± 2.19%)}	_{7.821s (± 2.51%)}	_~	_7.120s	_8.619s	_{p=0.091 n=20}
_{Emit Time}	_{3.226s (± 6.83%)}	_{3.409s (± 5.41%)}	_~	_2.876s	_4.223s	_{p=0.091 n=20}
_{Total Time}	_{12.711s (± 2.61%)}	_{12.742s (± 2.14%)}	_~	_11.623s	_13.958s	_{p=0.499 n=20}
_{webpack - native}
_Errors	₆₁₉	₆₁₉	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_924,267	_924,267	_~	_~	_~	_{p=1.000 n=20}
_Types	_646,050	_646,050	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{695,208k (± 0.02%)}	_{679,738k (± 0.01%)}	_{-15,470k (- 2.23%)}	_679,414k	_680,138k	_{p=0.000 n=20}
_{Memory Allocs}	_{6,681,717 (± 0.03%)}	_{6,721,798 (± 0.06%)}	_{+40,081 (+ 0.60%)}	_6,710,001	_6,742,899	_{p=0.000 n=20}
_{Config Time}	_0.004s	_0.004s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.146s (± 3.24%)}	_{0.155s (± 3.96%)}	_{🔻+0.009s (+ 6.11%)}	_0.129s	_0.184s	_{p=0.025 n=20}
_{Bind Time}	_{0.048s (± 8.71%)}	_{0.046s (± 8.77%)}	_~	_0.039s	_0.075s	_{p=0.277 n=20}
_{Check Time}	_{1.369s (± 0.81%)}	_{1.374s (± 1.29%)}	_~	_1.306s	_1.472s	_{p=0.482 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.592s (± 0.94%)}	_{1.605s (± 1.21%)}	_~	_1.539s	_1.694s	_{p=0.358 n=20}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_640,494	_640,494	_~	_~	_~	_{p=1.000 n=20}
_Types	_387,992	_387,992	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{350,910k (± 0.02%)}	_{342,793k (± 0.02%)}	_{-8,117k (- 2.31%)}	_342,547k	_343,138k	_{p=0.000 n=20}
_{Memory Allocs}	_{4,065,606 (± 0.07%)}	_{4,093,530 (± 0.10%)}	_{+27,924 (+ 0.69%)}	_4,083,716	_4,121,847	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.059s (± 2.60%)}	_{0.066s (± 2.93%)}	_{🔻+0.007s (+11.41%)}	_0.060s	_0.072s	_{p=0.000 n=20}
_{Bind Time}	_{0.021s (±10.19%)}	_{0.019s (±10.21%)}	_~	_0.016s	_0.030s	_{p=0.208 n=20}
_{Check Time}	_{0.419s (± 0.76%)}	_{0.412s (± 0.96%)}	_{-0.007s (- 1.66%)}	_0.398s	_0.427s	_{p=0.023 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.505s (± 0.82%)}	_{0.504s (± 1.05%)}	_~	_0.486s	_0.531s	_{p=0.909 n=20}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
arktype - native
class-transformer - native
effect - native
mui-docs - native
sentry - native
social-app - native
strada-build-src - native
strada-compiler - native
t3code-server - native
tanstack-router - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₂₀
_Baseline	_baseline	₂₀

Developer Information:

Download Benchmarks

The fixed name list lived in a standalone Go program run via go:generate, separate from the rest of our generated AST code. The Go generators that remain need to be Go for other reasons; this one did not, so move the list into tools/scripts/tsc/symbolNames.ts and emit symbolnames_generated.go from generate-go-ast.ts alongside the other AST outputs.

Lookups only read the slot tables and chunk pointers, while inserts write the shard locks, counts, and next ID. The shard stride wasn't a multiple of 64 and Go only guarantees 8-byte alignment, so neighbouring shards shared lines, and nextID shared a line with the first chunk pointers. Inserts on one core kept evicting lines that lookups on every other core needed. Group the read-mostly fields together, ahead of padded shards.

Each interned name held a heap string in a chunk of string headers, so a cache hit loaded the chunk header and then the string data, and every new name was a small GC-visible allocation. Store names as length- prefixed records in pointer-free chunks instead and use the record's offset as its ID; text is then one dependent load and the GC never scans it. Each shard bump-allocates from its own chunk, claimed with an atomic counter, so inserts on different shards don't contend. Records too large for a shared chunk get a dedicated run of chunks. Fixed names are inserted first, so their IDs are offsets the AST generator can compute; initialization panics if they disagree. The InternalSymbolName enum now reads its members from the same list.

With arena offsets as IDs, the 26-bit base ID field capped the table at 512MB of name text. Give the base ID the full low 32 bits, the most the hash slots can hold, and shrink derived-name numbers to 29 bits; larger numbers already fall back to interning the full text. A flat array of chunk pointers for 32GB of arena would be 16MB, so find chunks through a two-level directory whose small top level stays in cache.

Jake Bailey (jakebailey) · 2026-10-28T21:40:17Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-10-28T21:40:23Z

Hey Jake Bailey (@jakebailey), this PR is in an unmergable state, so is missing a merge commit to run against; please resolve conflicts and try again.

# Conflicts: # Herebyfile.mjs

Jake Bailey (jakebailey) · 2026-10-28T21:47:39Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-10-28T21:47:45Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this faster`	✅ Started	👀 Results

typescript-automation · 2026-10-28T22:35:25Z

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=20}
_Types	_79,607	_79,607	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{104,191k (± 0.03%)}	_{102,881k (± 0.03%)}	_{-1,310k (- 1.26%)}	_102,764k	_102,990k	_{p=0.000 n=20}
_{Memory Allocs}	_{2,200,855 (± 0.01%)}	_{2,150,558 (± 0.00%)}	_{-50,297 (- 2.29%)}	_2,150,311	_2,150,977	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.026s (± 2.44%)}	_{0.028s (± 3.62%)}	_{🔻+0.002s (+ 8.67%)}	_0.025s	_0.032s	_{p=0.001 n=20}
_{Bind Time}	_{0.011s (± 8.17%)}	_{0.010s (± 5.90%)}	_~	_0.009s	_0.013s	_{p=0.876 n=20}
_{Check Time}	_{0.258s (± 1.08%)}	_{0.250s (± 1.30%)}	_{🟩-0.008s (- 3.27%)}	_0.235s	_0.267s	_{p=0.000 n=20}
_{Emit Time}	_{0.183s (± 1.28%)}	_{0.182s (± 2.59%)}	_~	_0.166s	_0.209s	_{p=0.336 n=20}
_{Total Time}	_{0.481s (± 1.04%)}	_{0.474s (± 1.39%)}	_~	_0.443s	_0.496s	_{p=0.163 n=20}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_{586,560 (± 0.02%)}	_{586,563 (± 0.01%)}	_~	_586,083	_586,832	_{p=0.570 n=20}
_Types	_{241,688 (± 0.00%)}	_{241,689 (± 0.00%)}	_~	_241,685	_241,700	_{p=0.401 n=20}
_{Memory Used}	_{517,920k (± 0.02%)}	_{504,428k (± 0.02%)}	_{-13,492k (- 2.61%)}	_504,059k	_504,710k	_{p=0.000 n=20}
_{Memory Allocs}	_{13,118,282 (± 0.04%)}	_{13,093,196 (± 0.08%)}	_{-25,086 (- 0.19%)}	_13,081,174	_13,164,792	_{p=0.000 n=20}
_{Config Time}	_0.009s	_0.009s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.135s (± 3.71%)}	_{0.139s (± 1.95%)}	_{+0.004s (+ 3.04%)}	_0.131s	_0.154s	_{p=0.020 n=20}
_{Bind Time}	_{0.042s (± 7.04%)}	_{0.043s (±10.51%)}	_~	_0.035s	_0.061s	_{p=0.062 n=20}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=20}
_{Emit Time}	_{0.922s (± 0.99%)}	_{0.905s (± 1.25%)}	_{-0.018s (- 1.91%)}	_0.862s	_0.954s	_{p=0.015 n=20}
_{Total Time}	_{1.119s (± 0.69%)}	_{1.105s (± 0.72%)}	_{-0.014s (- 1.26%)}	_1.072s	_1.142s	_{p=0.008 n=20}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_685,920	_685,920	_~	_~	_~	_{p=1.000 n=20}
_Types	_939,467	_939,467	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{497,227k (± 0.01%)}	_{484,224k (± 0.01%)}	_{-13,003k (- 2.62%)}	_484,050k	_484,474k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,805,361 (± 0.02%)}	_{12,791,851 (± 0.01%)}	_{-13,509 (- 0.11%)}	_12,787,579	_12,798,921	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.046s (± 3.17%)}	_{0.049s (± 4.76%)}	_{🔻+0.003s (+ 6.59%)}	_0.041s	_0.060s	_{p=0.028 n=20}
_{Bind Time}	_{0.015s (± 8.13%)}	_{0.014s (± 6.17%)}	_{🟩-0.001s (- 9.67%)}	_0.012s	_0.019s	_{p=0.003 n=20}
_{Check Time}	_{1.123s (± 1.13%)}	_{1.125s (± 1.25%)}	_~	_1.065s	_1.180s	_{p=0.984 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.218s (± 1.03%)}	_{1.219s (± 1.21%)}	_~	_1.157s	_1.279s	_{p=0.784 n=20}
_{class-transformer - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_45,376	_45,376	_~	_~	_~	_{p=1.000 n=20}
_Types	_7,573	_7,573	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{27,838k (± 0.02%)}	_{28,079k (± 0.02%)}	_{+242k (+ 0.87%)}	_28,059k	_28,096k	_{p=0.000 n=20}
_{Memory Allocs}	_{323,512 (± 0.04%)}	_{320,457 (± 0.05%)}	_{-3,055 (- 0.94%)}	_319,737	_321,046	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.012s (± 4.76%)}	_{0.013s (± 3.69%)}	_{🔻+0.001s (+ 5.31%)}	_0.011s	_0.014s	_{p=0.031 n=20}
_{Bind Time}	_{0.004s (±11.66%)}	_{0.003s (±10.28%)}	_~	_0.002s	_0.005s	_{p=0.384 n=20}
_{Check Time}	_{0.009s (±15.85%)}	_{0.009s (± 5.77%)}	_~	_0.007s	_0.010s	_{p=0.726 n=20}
_{Emit Time}	_{0.011s (± 5.24%)}	_{0.009s (± 5.67%)}	_{🟩-0.001s (-13.02%)}	_0.008s	_0.011s	_{p=0.001 n=20}
_{Total Time}	_{0.036s (± 6.38%)}	_{0.035s (± 1.92%)}	_~	_0.033s	_0.038s	_{p=0.450 n=20}
_{effect - native}
_Errors	₁₂	₁₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,235,115	_1,235,115	_~	_~	_~	_{p=1.000 n=20}
_Types	_894,113	_894,113	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{940,447k (± 0.02%)}	_{919,634k (± 0.02%)}	_{-20,813k (- 2.21%)}	_919,023k	_920,483k	_{p=0.000 n=20}
_{Memory Allocs}	_{15,753,909 (± 0.02%)}	_{15,719,091 (± 0.05%)}	_{-34,818 (- 0.22%)}	_15,704,012	_15,780,428	_{p=0.000 n=20}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.159s (± 1.17%)}	_{0.165s (± 2.48%)}	_{+0.006s (+ 3.58%)}	_0.152s	_0.183s	_{p=0.046 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.995s (± 0.82%)}	_{0.990s (± 1.57%)}	_~	_0.953s	_1.103s	_{p=0.143 n=20}
_{Emit Time}	_{0.543s (± 1.88%)}	_{0.527s (± 1.51%)}	_{🟩-0.017s (- 3.05%)}	_0.494s	_0.562s	_{p=0.018 n=20}
_{Total Time}	_{1.798s (± 0.63%)}	_{1.780s (± 0.99%)}	_{-0.019s (- 1.05%)}	_1.715s	_1.894s	_{p=0.036 n=20}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_3,784,019	_3,784,019	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,355,974	_1,355,974	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,836,416k (± 0.06%)}	_{1,773,889k (± 0.07%)}	_{🟩-62,527k (- 3.40%)}	_1,769,379k	_1,777,742k	_{p=0.000 n=20}
_{Memory Allocs}	_{26,745,456 (± 0.06%)}	_{26,625,849 (± 0.04%)}	_{-119,607 (- 0.45%)}	_26,596,750	_26,672,370	_{p=0.000 n=20}
_{Config Time}	_{0.008s (± 2.33%)}	_{0.008s (± 2.33%)}	_~	_0.008s	_0.009s	_{p=1.000 n=20}
_{Parse Time}	_{0.301s (± 3.13%)}	_{0.292s (± 2.20%)}	_~	_0.255s	_0.319s	_{p=0.189 n=20}
_{Bind Time}	_{0.001s (±18.96%)}	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{3.241s (± 0.49%)}	_{2.954s (± 0.38%)}	_{🟩-0.287s (- 8.86%)}	_2.899s	_2.988s	_{p=0.000 n=20}
_{Emit Time}	_{0.246s (± 1.10%)}	_{0.243s (± 0.81%)}	_~	_0.235s	_0.251s	_{p=0.108 n=20}
_{Total Time}	_{4.289s (± 0.41%)}	_{3.986s (± 0.31%)}	_{🟩-0.303s (- 7.07%)}	_3.932s	_4.036s	_{p=0.000 n=20}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,793,245	_4,793,245	_~	_~	_~	_{p=1.000 n=20}
_Types	_2,607,047	_2,607,047	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,881,120k (± 0.05%)}	_{2,813,344k (± 0.03%)}	_{-67,776k (- 2.35%)}	_2,810,188k	_2,816,796k	_{p=0.000 n=20}
_{Memory Allocs}	_{75,986,627 (± 0.08%)}	_{75,784,592 (± 0.08%)}	_{-202,035 (- 0.27%)}	_75,544,477	_76,162,400	_{p=0.000 n=20}
_{Config Time}	_{0.027s (± 0.78%)}	_{0.027s (± 0.90%)}	_~	_0.026s	_0.027s	_{p=0.055 n=20}
_{Parse Time}	_{0.481s (± 3.79%)}	_{0.506s (± 4.74%)}	_~	_0.468s	_0.658s	_{p=0.132 n=20}
_{Bind Time}	_{0.163s (± 9.33%)}	_{0.153s (± 8.42%)}	_~	_0.128s	_0.218s	_{p=0.261 n=20}
_{Check Time}	_{7.150s (± 0.42%)}	_{6.822s (± 0.43%)}	_{🟩-0.328s (- 4.59%)}	_6.743s	_6.994s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.876s (± 0.36%)}	_{7.563s (± 0.45%)}	_{🟩-0.313s (- 3.97%)}	_7.472s	_7.765s	_{p=0.000 n=20}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,883,074	_1,883,074	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,158,170	_1,158,170	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{972,580k (± 0.02%)}	_{951,263k (± 0.01%)}	_{-21,318k (- 2.19%)}	_950,797k	_951,805k	_{p=0.000 n=20}
_{Memory Allocs}	_{13,712,885 (± 0.13%)}	_{13,655,938 (± 0.14%)}	_{-56,948 (- 0.42%)}	_13,609,069	_13,765,060	_{p=0.000 n=20}
_{Config Time}	_0.008s	_0.008s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.162s (± 2.00%)}	_{0.170s (± 2.99%)}	_{🔻+0.007s (+ 4.43%)}	_0.157s	_0.201s	_{p=0.002 n=20}
_{Bind Time}	_{0.038s (± 3.21%)}	_{0.037s (± 3.97%)}	_~	_0.033s	_0.047s	_{p=0.137 n=20}
_{Check Time}	_{1.535s (± 0.42%)}	_{1.491s (± 0.49%)}	_{-0.045s (- 2.91%)}	_1.466s	_1.523s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.761s (± 0.46%)}	_{1.722s (± 0.53%)}	_{-0.039s (- 2.24%)}	_1.689s	_1.765s	_{p=0.000 n=20}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,184,972	_1,184,972	_~	_~	_~	_{p=1.000 n=20}
_Types	_438,963	_438,963	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,173,324k (± 0.22%)}	_{1,154,814k (± 0.46%)}	_{-18,510k (- 1.58%)}	_1,130,584k	_1,186,897k	_{p=0.000 n=20}
_{Memory Allocs}	_{77,563,196 (± 0.09%)}	_{77,001,209 (± 0.11%)}	_{-561,987 (- 0.72%)}	_76,668,128	_77,455,748	_{p=0.000 n=20}
_{Config Time}	_{0.002s (±13.56%)}	_{0.004s (±10.70%)}	_{🔻+0.002s (+122.22%)}	_0.002s	_0.005s	_{p=0.000 n=20}
_{Parse Time}	_{0.148s (± 1.61%)}	_{0.158s (± 1.82%)}	_{🔻+0.010s (+ 6.54%)}	_0.146s	_0.171s	_{p=0.000 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.838s (± 0.39%)}	_{0.797s (± 0.81%)}	_{🟩-0.042s (- 4.99%)}	_0.781s	_0.839s	_{p=0.000 n=20}
_{Emit Time}	_{0.180s (± 1.43%)}	_{0.172s (± 2.36%)}	_{🟩-0.007s (- 4.12%)}	_0.157s	_0.188s	_{p=0.006 n=20}
_{Total Time}	_{10.206s (± 0.48%)}	_{9.994s (± 0.90%)}	_{-0.212s (- 2.08%)}	_9.800s	_10.589s	_{p=0.000 n=20}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_263,511	_263,511	_~	_~	_~	_{p=1.000 n=20}
_Types	_196,116	_196,116	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{224,537k (± 0.02%)}	_{219,766k (± 0.02%)}	_{-4,771k (- 2.12%)}	_219,566k	_219,943k	_{p=0.000 n=20}
_{Memory Allocs}	_{4,304,322 (± 0.01%)}	_{4,294,596 (± 0.01%)}	_{-9,726 (- 0.23%)}	_4,293,598	_4,295,788	_{p=0.000 n=20}
_{Config Time}	_0.000s	_{0.000s (±208.60%)}	_~	_0.000s	_0.001s	_{p=1.000 n=20}
_{Parse Time}	_{0.060s (± 3.52%)}	_{0.075s (± 6.14%)}	_{🔻+0.014s (+24.00%)}	_0.065s	_0.111s	_{p=0.000 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.492s (± 2.62%)}	_{0.481s (± 3.05%)}	_~	_0.411s	_0.527s	_{p=0.080 n=20}
_{Emit Time}	_{0.092s (± 6.10%)}	_{0.091s (± 5.46%)}	_~	_0.078s	_0.126s	_{p=0.424 n=20}
_{Total Time}	_{0.679s (± 2.70%)}	_{0.682s (± 2.96%)}	_~	_0.590s	_0.767s	_{p=0.794 n=20}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,350,661	_4,350,661	_~	_~	_~	_{p=1.000 n=20}
_Types	_3,040,647	_3,040,647	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,433,744k (± 0.03%)}	_{2,386,427k (± 0.02%)}	_{-47,317k (- 1.94%)}	_2,385,152k	_2,388,121k	_{p=0.000 n=20}
_{Memory Allocs}	_{37,875,839 (± 0.04%)}	_{37,776,449 (± 0.04%)}	_{-99,390 (- 0.26%)}	_37,734,810	_37,847,430	_{p=0.000 n=20}
_{Config Time}	_0.003s	_0.003s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.261s (± 1.66%)}	_{0.265s (± 2.96%)}	_~	_0.242s	_0.304s	_{p=0.457 n=20}
_{Bind Time}	_{0.082s (± 6.20%)}	_{0.087s (± 9.31%)}	_~	_0.072s	_0.128s	_{p=0.732 n=20}
_{Check Time}	_{7.575s (± 0.58%)}	_{7.583s (± 0.45%)}	_~	_7.468s	_7.750s	_{p=0.499 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.932s (± 0.56%)}	_{7.949s (± 0.42%)}	_~	_7.836s	_8.106s	_{p=0.298 n=20}
_{tanstack-router - native}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_571,756	_571,756	_~	_~	_~	_{p=1.000 n=20}
_Types	_397,689	_397,689	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{331,416k (± 0.02%)}	_{323,515k (± 0.02%)}	_{-7,901k (- 2.38%)}	_323,213k	_323,740k	_{p=0.000 n=20}
_{Memory Allocs}	_{5,095,177 (± 0.10%)}	_{5,089,963 (± 0.13%)}	_{-5,214 (- 0.10%)}	_5,078,393	_5,133,309	_{p=0.006 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.046s (± 4.63%)}	_{0.050s (± 3.34%)}	_{🔻+0.003s (+ 6.90%)}	_0.043s	_0.055s	_{p=0.017 n=20}
_{Bind Time}	_{0.016s (±10.69%)}	_{0.015s (±11.33%)}	_~	_0.012s	_0.024s	_{p=0.200 n=20}
_{Check Time}	_{0.670s (± 1.95%)}	_{0.639s (± 1.40%)}	_{🟩-0.031s (- 4.61%)}	_0.614s	_0.695s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.757s (± 1.67%)}	_{0.729s (± 1.23%)}	_{🟩-0.027s (- 3.62%)}	_0.704s	_0.784s	_{p=0.000 n=20}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_231,616	_231,616	_~	_~	_~	_{p=1.000 n=20}
_Types	_181,195	_181,195	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{193,564k (± 0.01%)}	_{189,412k (± 0.01%)}	_{-4,153k (- 2.15%)}	_189,301k	_189,558k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,373,295 (± 0.01%)}	_{1,365,151 (± 0.01%)}	_{-8,144 (- 0.59%)}	_1,364,373	_1,365,761	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.047s (± 2.54%)}	_{0.050s (± 2.73%)}	_{🔻+0.003s (+ 6.09%)}	_0.043s	_0.056s	_{p=0.001 n=20}
_{Bind Time}	_{0.021s (± 5.82%)}	_{0.021s (± 4.86%)}	_~	_0.017s	_0.026s	_{p=0.855 n=20}
_{Check Time}	_{0.306s (± 0.99%)}	_{0.296s (± 0.85%)}	_{🟩-0.010s (- 3.19%)}	_0.287s	_0.303s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.380s (± 0.71%)}	_{0.373s (± 0.73%)}	_{-0.007s (- 1.88%)}	_0.362s	_0.386s	_{p=0.001 n=20}
_{vscode - native}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_7,387,991	_7,387,991	_~	_~	_~	_{p=1.000 n=20}
_Types	_4,346,718	_4,346,718	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{5,141,646k (± 0.03%)}	_{4,982,151k (± 0.02%)}	_{🟩-159,496k (- 3.10%)}	_4,979,930k	_4,986,569k	_{p=0.000 n=20}
_{Memory Allocs}	_{64,902,608 (± 0.07%)}	_{64,583,289 (± 0.01%)}	_{-319,319 (- 0.49%)}	_64,566,566	_64,620,985	_{p=0.000 n=20}
_{Config Time}	_{0.034s (± 0.88%)}	_{0.034s (± 2.96%)}	_{-0.000s (- 0.15%)}	_0.033s	_0.043s	_{p=0.034 n=20}
_{Parse Time}	_{0.987s (± 1.53%)}	_{1.053s (± 2.11%)}	_{🔻+0.066s (+ 6.71%)}	_0.955s	_1.165s	_{p=0.000 n=20}
_{Bind Time}	_{0.345s (± 6.83%)}	_{0.349s (± 9.26%)}	_~	_0.299s	_0.543s	_{p=0.279 n=20}
_{Check Time}	_{8.287s (± 0.46%)}	_{8.152s (± 0.62%)}	_{-0.135s (- 1.63%)}	_7.935s	_8.387s	_{p=0.000 n=20}
_{Emit Time}	_{3.043s (± 5.23%)}	_{3.147s (± 5.75%)}	_~	_2.796s	_3.833s	_{p=0.199 n=20}
_{Total Time}	_{12.759s (± 1.09%)}	_{12.800s (± 1.31%)}	_~	_12.468s	_13.496s	_{p=0.703 n=20}
_{webpack - native}
_Errors	₆₁₉	₆₁₉	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_917,280	_917,280	_~	_~	_~	_{p=1.000 n=20}
_Types	_632,992	_632,992	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{690,395k (± 0.02%)}	_{674,689k (± 0.01%)}	_{-15,706k (- 2.27%)}	_674,386k	_675,068k	_{p=0.000 n=20}
_{Memory Allocs}	_{6,605,075 (± 0.04%)}	_{6,574,586 (± 0.03%)}	_{-30,490 (- 0.46%)}	_6,569,142	_6,584,862	_{p=0.000 n=20}
_{Config Time}	_0.004s	_0.004s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.148s (± 3.22%)}	_{0.149s (± 2.87%)}	_~	_0.133s	_0.164s	_{p=0.804 n=20}
_{Bind Time}	_{0.049s (±10.46%)}	_{0.046s (± 9.34%)}	_~	_0.038s	_0.067s	_{p=0.187 n=20}
_{Check Time}	_{1.190s (± 0.49%)}	_{1.179s (± 0.33%)}	_{-0.011s (- 0.89%)}	_1.166s	_1.195s	_{p=0.005 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.416s (± 0.51%)}	_{1.401s (± 0.50%)}	_{-0.014s (- 1.02%)}	_1.368s	_1.419s	_{p=0.008 n=20}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_640,490	_640,490	_~	_~	_~	_{p=1.000 n=20}
_Types	_387,988	_387,988	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{350,944k (± 0.02%)}	_{342,880k (± 0.02%)}	_{-8,064k (- 2.30%)}	_342,658k	_343,239k	_{p=0.000 n=20}
_{Memory Allocs}	_{4,067,278 (± 0.07%)}	_{4,056,152 (± 0.12%)}	_{-11,126 (- 0.27%)}	_4,044,517	_4,086,056	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.062s (± 2.91%)}	_{0.066s (± 2.50%)}	_{🔻+0.004s (+ 6.93%)}	_0.060s	_0.075s	_{p=0.002 n=20}
_{Bind Time}	_{0.021s (±10.06%)}	_{0.020s (±11.40%)}	_~	_0.015s	_0.030s	_{p=0.164 n=20}
_{Check Time}	_{0.417s (± 0.75%)}	_{0.404s (± 0.54%)}	_{🟩-0.014s (- 3.26%)}	_0.395s	_0.414s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.507s (± 0.75%)}	_{0.496s (± 0.80%)}	_{-0.011s (- 2.13%)}	_0.481s	_0.510s	_{p=0.000 n=20}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
arktype - native
class-transformer - native
effect - native
mui-docs - native
sentry - native
social-app - native
strada-build-src - native
strada-compiler - native
t3code-server - native
tanstack-router - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₂₀
_Baseline	_baseline	₂₀

Developer Information:

Download Benchmarks

Jake Bailey (jakebailey) · 2026-10-28T22:38:54Z

So, to get the parse time down from the interning cost requires nasty stuff, but, it does seem like it works.

This still leaks and it's still 32-bit's worth of user provided names (which has nice benefits for the hashing stuff over using more bits), but that is something like 2 billion names?

The read-mostly and written halves of the table were kept apart by padding inside one struct, which relied on the table starting on a cache line. With the two-level directory the table is small enough to get a size-class allocation, and since it holds pointers the runtime puts an 8-byte header before it, so the shards were 8 bytes off. Move the shards and chunk counter into a separate pointer-free allocation, which has no header and a size class that's a multiple of 64 bytes.

Jake Bailey (jakebailey) · 2026-10-28T22:51:51Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-10-28T22:51:57Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this faster`	✅ Started	👀 Results

typescript-automation · 2026-10-28T23:45:58Z

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=20}
_Types	_79,607	_79,607	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{104,148k (± 0.03%)}	_{102,867k (± 0.03%)}	_{-1,281k (- 1.23%)}	_102,753k	_102,986k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,263,816 (± 0.01%)}	_{1,213,605 (± 0.01%)}	_{🟩-50,212 (- 3.97%)}	_1,213,132	_1,214,036	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.023s (± 2.35%)}	_{0.025s (± 2.16%)}	_{🔻+0.002s (+ 9.52%)}	_0.022s	_0.027s	_{p=0.000 n=20}
_{Bind Time}	_{0.009s (± 4.74%)}	_{0.009s (± 5.10%)}	_~	_0.007s	_0.010s	_{p=0.629 n=20}
_{Check Time}	_{0.212s (± 0.69%)}	_{0.204s (± 0.63%)}	_{🟩-0.008s (- 3.85%)}	_0.198s	_0.207s	_{p=0.000 n=20}
_{Emit Time}	_{0.138s (± 1.09%)}	_{0.136s (± 0.88%)}	_{-0.002s (- 1.70%)}	_0.132s	_0.144s	_{p=0.002 n=20}
_{Total Time}	_{0.386s (± 0.53%)}	_{0.377s (± 0.37%)}	_{-0.009s (- 2.24%)}	_0.372s	_0.384s	_{p=0.000 n=20}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_{586,577 (± 0.02%)}	_{586,502 (± 0.01%)}	_~	_586,190	_586,847	_{p=0.163 n=20}
_Types	_{241,688 (± 0.00%)}	_{241,687 (± 0.00%)}	_~	_241,685	_241,691	_{p=0.358 n=20}
_{Memory Used}	_{517,965k (± 0.02%)}	_{504,414k (± 0.01%)}	_{-13,551k (- 2.62%)}	_504,082k	_504,726k	_{p=0.000 n=20}
_{Memory Allocs}	_{7,797,683 (± 0.11%)}	_{7,763,526 (± 0.04%)}	_{-34,157 (- 0.44%)}	_7,757,915	_7,782,210	_{p=0.000 n=20}
_{Config Time}	_{0.008s (± 2.82%)}	_{0.008s (± 2.73%)}	_~	_0.008s	_0.009s	_{p=0.748 n=20}
_{Parse Time}	_{0.129s (± 5.11%)}	_{0.140s (± 3.58%)}	_{🔻+0.011s (+ 8.52%)}	_0.126s	_0.169s	_{p=0.001 n=20}
_{Bind Time}	_{0.048s (±11.44%)}	_{0.046s (±15.99%)}	_{🟩-0.002s (- 3.98%)}	_0.038s	_0.104s	_{p=0.009 n=20}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=20}
_{Emit Time}	_{0.868s (± 1.21%)}	_{0.860s (± 2.60%)}	_{-0.007s (- 0.85%)}	_0.829s	_1.050s	_{p=0.041 n=20}
_{Total Time}	_{1.063s (± 1.42%)}	_{1.065s (± 2.60%)}	_~	_1.019s	_1.269s	_{p=0.394 n=20}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_685,920	_685,920	_~	_~	_~	_{p=1.000 n=20}
_Types	_939,467	_939,467	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{497,333k (± 0.01%)}	_{484,290k (± 0.01%)}	_{-13,043k (- 2.62%)}	_484,006k	_484,447k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,110,409 (± 0.02%)}	_{12,095,728 (± 0.01%)}	_{-14,681 (- 0.12%)}	_12,091,333	_12,104,605	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.046s (± 3.31%)}	_{0.048s (± 4.42%)}	_~	_0.040s	_0.056s	_{p=0.146 n=20}
_{Bind Time}	_{0.015s (±10.55%)}	_{0.015s (±11.05%)}	_~	_0.012s	_0.021s	_{p=0.448 n=20}
_{Check Time}	_{1.057s (± 1.87%)}	_{1.057s (± 1.77%)}	_~	_1.007s	_1.160s	_{p=0.973 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.151s (± 1.80%)}	_{1.151s (± 1.70%)}	_~	_1.101s	_1.261s	_{p=0.909 n=20}
_{class-transformer - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_45,376	_45,376	_~	_~	_~	_{p=1.000 n=20}
_Types	_7,573	_7,573	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{27,835k (± 0.02%)}	_{28,075k (± 0.02%)}	_{+239k (+ 0.86%)}	_28,055k	_28,091k	_{p=0.000 n=20}
_{Memory Allocs}	_{248,543 (± 0.05%)}	_{245,598 (± 0.07%)}	_{-2,946 (- 1.19%)}	_245,033	_246,435	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.011s (± 2.66%)}	_{0.012s (± 3.60%)}	_{🔻+0.001s (+ 6.48%)}	_0.010s	_0.013s	_{p=0.006 n=20}
_{Bind Time}	_{0.003s (± 9.34%)}	_{0.003s (±10.50%)}	_~	_0.002s	_0.005s	_{p=0.192 n=20}
_{Check Time}	_{0.008s (± 4.40%)}	_{0.008s (± 6.05%)}	_~	_0.006s	_0.010s	_{p=0.551 n=20}
_{Emit Time}	_{0.008s (± 5.79%)}	_{0.008s (± 7.26%)}	_~	_0.007s	_0.012s	_{p=0.477 n=20}
_{Total Time}	_{0.031s (± 1.55%)}	_{0.032s (± 2.18%)}	_~	_0.028s	_0.034s	_{p=0.272 n=20}
_{effect - native}
_Errors	₁₂	₁₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,235,115	_1,235,115	_~	_~	_~	_{p=1.000 n=20}
_Types	_894,113	_894,113	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{940,750k (± 0.02%)}	_{919,503k (± 0.02%)}	_{-21,247k (- 2.26%)}	_918,815k	_920,787k	_{p=0.000 n=20}
_{Memory Allocs}	_{12,671,840 (± 0.02%)}	_{12,628,843 (± 0.04%)}	_{-42,997 (- 0.34%)}	_12,617,234	_12,655,526	_{p=0.000 n=20}
_{Config Time}	_{0.002s (± 5.09%)}	_{0.002s (± 5.09%)}	_~	_0.002s	_0.003s	_{p=1.000 n=20}
_{Parse Time}	_{0.153s (± 1.84%)}	_{0.163s (± 2.39%)}	_{🔻+0.010s (+ 6.35%)}	_0.151s	_0.182s	_{p=0.000 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.964s (± 1.27%)}	_{0.948s (± 1.16%)}	_{-0.016s (- 1.64%)}	_0.918s	_1.012s	_{p=0.047 n=20}
_{Emit Time}	_{0.523s (± 2.12%)}	_{0.521s (± 2.58%)}	_~	_0.470s	_0.571s	_{p=0.962 n=20}
_{Total Time}	_{1.738s (± 0.75%)}	_{1.732s (± 1.23%)}	_~	_1.678s	_1.839s	_{p=0.304 n=20}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_3,784,019	_3,784,019	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,355,974	_1,355,974	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,834,863k (± 0.06%)}	_{1,774,543k (± 0.08%)}	_{🟩-60,320k (- 3.29%)}	_1,770,115k	_1,780,850k	_{p=0.000 n=20}
_{Memory Allocs}	_{26,001,325 (± 0.14%)}	_{25,882,052 (± 0.11%)}	_{-119,273 (- 0.46%)}	_25,800,191	_26,058,956	_{p=0.000 n=20}
_{Config Time}	_{0.009s (± 1.87%)}	_{0.009s (± 1.68%)}	_~	_0.008s	_0.010s	_{p=0.369 n=20}
_{Parse Time}	_{0.323s (± 1.83%)}	_{0.338s (± 2.02%)}	_{🔻+0.014s (+ 4.41%)}	_0.313s	_0.371s	_{p=0.002 n=20}
_{Bind Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{3.350s (± 0.93%)}	_{3.041s (± 1.38%)}	_{🟩-0.309s (- 9.22%)}	_2.900s	_3.211s	_{p=0.000 n=20}
_{Emit Time}	_{0.255s (± 1.86%)}	_{0.269s (± 6.05%)}	_{🔻+0.014s (+ 5.46%)}	_0.245s	_0.375s	_{p=0.016 n=20}
_{Total Time}	_{4.528s (± 0.66%)}	_{4.237s (± 0.96%)}	_{🟩-0.291s (- 6.43%)}	_4.085s	_4.418s	_{p=0.000 n=20}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,793,245	_4,793,245	_~	_~	_~	_{p=1.000 n=20}
_Types	_2,607,047	_2,607,047	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,880,504k (± 0.04%)}	_{2,813,125k (± 0.04%)}	_{-67,379k (- 2.34%)}	_2,810,050k	_2,818,560k	_{p=0.000 n=20}
_{Memory Allocs}	_{75,226,997 (± 0.18%)}	_{75,446,027 (± 0.35%)}	_~	_74,762,584	_76,755,278	_{p=0.398 n=20}
_{Config Time}	_{0.030s (±11.58%)}	_{0.027s (± 1.24%)}	_~	_0.026s	_0.028s	_{p=0.184 n=20}
_{Parse Time}	_{0.566s (± 5.69%)}	_{0.606s (± 2.98%)}	_{🔻+0.041s (+ 7.19%)}	_0.546s	_0.669s	_{p=0.001 n=20}
_{Bind Time}	_{0.194s (±12.16%)}	_{0.170s (± 8.63%)}	_~	_0.144s	_0.261s	_{p=0.140 n=20}
_{Check Time}	_{7.870s (± 0.63%)}	_{7.585s (± 0.69%)}	_{🟩-0.285s (- 3.62%)}	_7.409s	_7.852s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{8.718s (± 0.61%)}	_{8.446s (± 0.61%)}	_{🟩-0.272s (- 3.12%)}	_8.291s	_8.669s	_{p=0.000 n=20}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,883,074	_1,883,074	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,158,170	_1,158,170	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{972,509k (± 0.02%)}	_{951,182k (± 0.02%)}	_{-21,328k (- 2.19%)}	_950,133k	_952,048k	_{p=0.000 n=20}
_{Memory Allocs}	_{13,585,292 (± 0.31%)}	_{13,519,703 (± 0.26%)}	_{-65,589 (- 0.48%)}	_13,463,785	_13,801,480	_{p=0.000 n=20}
_{Config Time}	_0.008s	_0.008s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.161s (± 3.48%)}	_{0.170s (± 1.69%)}	_{🔻+0.009s (+ 5.48%)}	_0.156s	_0.180s	_{p=0.000 n=20}
_{Bind Time}	_{0.045s (± 8.45%)}	_{0.040s (± 3.19%)}	_{🟩-0.004s (-10.01%)}	_0.038s	_0.048s	_{p=0.006 n=20}
_{Check Time}	_{1.501s (± 0.46%)}	_{1.459s (± 0.52%)}	_{-0.042s (- 2.80%)}	_1.422s	_1.498s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.732s (± 0.47%)}	_{1.693s (± 0.42%)}	_{-0.039s (- 2.28%)}	_1.668s	_1.735s	_{p=0.000 n=20}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,184,972	_1,184,972	_~	_~	_~	_{p=1.000 n=20}
_Types	_438,963	_438,963	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,165,237k (± 0.32%)}	_{1,142,128k (± 0.21%)}	_{-23,109k (- 1.98%)}	_1,132,515k	_1,152,694k	_{p=0.000 n=20}
_{Memory Allocs}	_{47,680,759 (± 0.11%)}	_{47,306,097 (± 0.04%)}	_{-374,663 (- 0.79%)}	_47,244,863	_47,398,883	_{p=0.000 n=20}
_{Config Time}	_{0.002s (±12.21%)}	_{0.004s (±14.48%)}	_{🔻+0.002s (+92.31%)}	_0.002s	_0.007s	_{p=0.000 n=20}
_{Parse Time}	_{0.140s (± 1.99%)}	_{0.153s (± 1.97%)}	_{🔻+0.013s (+ 9.40%)}	_0.144s	_0.174s	_{p=0.000 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.826s (± 1.70%)}	_{0.777s (± 1.36%)}	_{🟩-0.049s (- 5.90%)}	_0.755s	_0.829s	_{p=0.000 n=20}
_{Emit Time}	_{0.142s (± 1.45%)}	_{0.138s (± 4.78%)}	_{-0.003s (- 2.33%)}	_0.131s	_0.197s	_{p=0.000 n=20}
_{Total Time}	_{9.550s (± 1.49%)}	_{9.341s (± 1.66%)}	_{-0.209s (- 2.19%)}	_9.098s	_10.503s	_{p=0.000 n=20}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_263,511	_263,511	_~	_~	_~	_{p=1.000 n=20}
_Types	_196,116	_196,116	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{224,629k (± 0.02%)}	_{219,729k (± 0.02%)}	_{-4,900k (- 2.18%)}	_219,576k	_219,861k	_{p=0.000 n=20}
_{Memory Allocs}	_{2,401,421 (± 0.01%)}	_{2,391,910 (± 0.01%)}	_{-9,511 (- 0.40%)}	_2,390,387	_2,392,957	_{p=0.000 n=20}
_{Config Time}	_{0.000s (±208.60%)}	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.051s (± 3.12%)}	_{0.058s (± 6.83%)}	_{🔻+0.008s (+15.25%)}	_0.050s	_0.090s	_{p=0.000 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.404s (± 3.10%)}	_{0.388s (± 1.10%)}	_{🟩-0.016s (- 3.94%)}	_0.372s	_0.403s	_{p=0.009 n=20}
_{Emit Time}	_{0.053s (± 5.69%)}	_{0.052s (± 5.06%)}	_~	_0.042s	_0.060s	_{p=0.835 n=20}
_{Total Time}	_{0.540s (± 3.41%)}	_{0.527s (± 1.30%)}	_~	_0.506s	_0.564s	_{p=0.330 n=20}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,350,661	_4,350,661	_~	_~	_~	_{p=1.000 n=20}
_Types	_3,040,647	_3,040,647	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,433,448k (± 0.02%)}	_{2,386,920k (± 0.03%)}	_{-46,528k (- 1.91%)}	_2,384,492k	_2,390,078k	_{p=0.000 n=20}
_{Memory Allocs}	_{37,402,928 (± 0.10%)}	_{37,253,455 (± 0.07%)}	_{-149,473 (- 0.40%)}	_37,189,261	_37,397,622	_{p=0.000 n=20}
_{Config Time}	_{0.003s (± 6.00%)}	_0.003s	_~	_~	_~	_{p=0.231 n=20}
_{Parse Time}	_{0.255s (± 2.22%)}	_{0.257s (± 2.23%)}	_~	_0.233s	_0.276s	_{p=0.533 n=20}
_{Bind Time}	_{0.090s (±10.38%)}	_{0.093s (±10.77%)}	_~	_0.075s	_0.142s	_{p=0.643 n=20}
_{Check Time}	_{7.417s (± 1.74%)}	_{7.362s (± 1.80%)}	_{-0.056s (- 0.75%)}	_7.100s	_7.794s	_{p=0.047 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.778s (± 1.67%)}	_{7.725s (± 1.79%)}	_~	_7.446s	_8.198s	_{p=0.064 n=20}
_{tanstack-router - native}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_571,756	_571,756	_~	_~	_~	_{p=1.000 n=20}
_Types	_397,689	_397,689	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{331,451k (± 0.01%)}	_{323,514k (± 0.01%)}	_{-7,937k (- 2.39%)}	_323,323k	_323,699k	_{p=0.000 n=20}
_{Memory Allocs}	_{4,396,795 (± 0.17%)}	_{4,391,821 (± 0.27%)}	_~	_4,366,431	_4,461,664	_{p=0.081 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.044s (± 4.38%)}	_{0.046s (± 4.62%)}	_~	_0.039s	_0.057s	_{p=0.212 n=20}
_{Bind Time}	_{0.015s (±10.88%)}	_{0.013s (±10.56%)}	_~	_0.010s	_0.019s	_{p=0.096 n=20}
_{Check Time}	_{0.597s (± 1.57%)}	_{0.586s (± 2.46%)}	_{-0.011s (- 1.89%)}	_0.550s	_0.703s	_{p=0.003 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.677s (± 1.44%)}	_{0.664s (± 2.25%)}	_{-0.013s (- 1.92%)}	_0.624s	_0.783s	_{p=0.007 n=20}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_231,616	_231,616	_~	_~	_~	_{p=1.000 n=20}
_Types	_181,195	_181,195	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{193,520k (± 0.01%)}	_{189,366k (± 0.01%)}	_{-4,153k (- 2.15%)}	_189,281k	_189,453k	_{p=0.000 n=20}
_{Memory Allocs}	_{1,318,147 (± 0.02%)}	_{1,310,123 (± 0.02%)}	_{-8,024 (- 0.61%)}	_1,309,359	_1,311,322	_{p=0.000 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.045s (± 3.88%)}	_{0.049s (± 2.33%)}	_{🔻+0.004s (+ 8.47%)}	_0.045s	_0.053s	_{p=0.001 n=20}
_{Bind Time}	_{0.022s (± 4.83%)}	_{0.021s (± 4.14%)}	_~	_0.018s	_0.026s	_{p=0.338 n=20}
_{Check Time}	_{0.315s (± 1.35%)}	_{0.306s (± 0.90%)}	_{-0.009s (- 2.92%)}	_0.293s	_0.317s	_{p=0.001 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.388s (± 1.12%)}	_{0.382s (± 0.75%)}	_{-0.007s (- 1.70%)}	_0.370s	_0.396s	_{p=0.020 n=20}
_{vscode - native}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_7,399,203	_7,399,203	_~	_~	_~	_{p=1.000 n=20}
_Types	_4,359,460	_4,359,460	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{5,150,046k (± 0.01%)}	_{4,990,982k (± 0.02%)}	_{🟩-159,064k (- 3.09%)}	_4,988,571k	_4,995,317k	_{p=0.000 n=20}
_{Memory Allocs}	_{56,424,020 (± 0.03%)}	_{56,148,340 (± 0.03%)}	_{-275,679 (- 0.49%)}	_56,115,998	_56,217,654	_{p=0.000 n=20}
_{Config Time}	_{0.035s (± 0.93%)}	_{0.035s (± 1.42%)}	_~	_0.033s	_0.036s	_{p=0.301 n=20}
_{Parse Time}	_{0.919s (± 2.02%)}	_{0.979s (± 3.33%)}	_{🔻+0.061s (+ 6.59%)}	_0.860s	_1.108s	_{p=0.005 n=20}
_{Bind Time}	_{0.330s (± 6.05%)}	_{0.375s (±12.14%)}	_~	_0.291s	_0.658s	_{p=0.095 n=20}
_{Check Time}	_{7.843s (± 1.30%)}	_{7.704s (± 1.24%)}	_~	_7.221s	_8.049s	_{p=0.062 n=20}
_{Emit Time}	_{2.891s (± 5.60%)}	_{3.098s (± 7.42%)}	_~	_2.575s	_3.790s	_{p=0.753 n=20}
_{Total Time}	_{12.076s (± 1.42%)}	_{12.254s (± 2.31%)}	_~	_11.354s	_13.209s	_{p=0.441 n=20}
_{webpack - native}
_Errors	₆₁₉	₆₁₉	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_925,723	_925,723	_~	_~	_~	_{p=1.000 n=20}
_Types	_643,578	_643,578	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{697,659k (± 0.02%)}	_{681,804k (± 0.02%)}	_{-15,855k (- 2.27%)}	_681,381k	_682,298k	_{p=0.000 n=20}
_{Memory Allocs}	_{6,552,828 (± 0.05%)}	_{6,523,897 (± 0.06%)}	_{-28,931 (- 0.44%)}	_6,515,330	_6,552,924	_{p=0.000 n=20}
_{Config Time}	_0.004s	_0.004s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.141s (± 2.96%)}	_{0.152s (± 2.66%)}	_{🔻+0.011s (+ 7.89%)}	_0.136s	_0.168s	_{p=0.001 n=20}
_{Bind Time}	_{0.044s (± 7.90%)}	_{0.046s (±10.04%)}	_~	_0.037s	_0.071s	_{p=0.652 n=20}
_{Check Time}	_{1.196s (± 0.45%)}	_{1.178s (± 0.57%)}	_{-0.018s (- 1.46%)}	_1.156s	_1.209s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.408s (± 0.57%)}	_{1.405s (± 0.71%)}	_~	_1.373s	_1.451s	_{p=0.498 n=20}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_640,490	_640,490	_~	_~	_~	_{p=1.000 n=20}
_Types	_387,988	_387,988	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{350,924k (± 0.02%)}	_{342,789k (± 0.02%)}	_{-8,136k (- 2.32%)}	_342,572k	_343,224k	_{p=0.000 n=20}
_{Memory Allocs}	_{3,991,135 (± 0.07%)}	_{3,978,908 (± 0.17%)}	_{-12,227 (- 0.31%)}	_3,964,109	_4,026,562	_{p=0.000 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.060s (± 2.43%)}	_{0.063s (± 3.32%)}	_{🔻+0.003s (+ 5.25%)}	_0.056s	_0.074s	_{p=0.022 n=20}
_{Bind Time}	_{0.022s (±10.86%)}	_{0.021s (±12.71%)}	_~	_0.016s	_0.031s	_{p=0.163 n=20}
_{Check Time}	_{0.422s (± 0.94%)}	_{0.412s (± 0.80%)}	_{-0.010s (- 2.31%)}	_0.402s	_0.430s	_{p=0.000 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.510s (± 0.97%)}	_{0.501s (± 0.78%)}	_{-0.009s (- 1.70%)}	_0.490s	_0.527s	_{p=0.002 n=20}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
arktype - native
class-transformer - native
effect - native
mui-docs - native
sentry - native
social-app - native
strada-build-src - native
strada-compiler - native
t3code-server - native
tanstack-router - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₂₀
_Baseline	_baseline	₂₀

Developer Information:

Download Benchmarks

typescript-automation Bot assigned Jake Bailey (jakebailey) Oct 8, 2026

typescript-automation Bot added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Oct 8, 2026

Jake Bailey (jakebailey) force-pushed the intern-symbol-names branch from 23581b2 to 7428ff5 Compare October 15, 2026 16:55

Jake Bailey (jakebailey) added 7 commits October 26, 2026 15:07

Intern symbol names with unique handles

45e3b50

Symbols should share canonical names so identity checks and symbol-table lookups do not repeatedly compare string contents. Preserve textual behavior for diagnostics, emitted output, and the JavaScript API.

Hoist fixed symbol names and preserve handle boundaries

544fa3d

Known names and intermediate name operations should stay interned; repeated interning and string round trips defeat the canonical representation in frequently used lookup paths.

Jake Bailey (jakebailey) force-pushed the intern-symbol-names branch from c5c9ae2 to 395d87b Compare October 26, 2026 22:09

Jake Bailey (jakebailey) changed the title ~~Switch to type SymbolName unique.Handle[string]~~ Intern symbol names as 32-bit IDs Oct 26, 2026

Jake Bailey (jakebailey) added the Domain: Performance Reports of unusually slow behavior label Oct 27, 2026

Jake Bailey (jakebailey) changed the title ~~Intern symbol names as 32-bit IDs~~ Intern symbol names as pointer-free IDs Oct 28, 2026

Jake Bailey (jakebailey) commented Oct 28, 2026

View reviewed changes

Jake Bailey (jakebailey) added 4 commits October 28, 2026 12:41

Merge remote-tracking branch 'upstream/main' into intern-symbol-names

fdc0479

# Conflicts: # Herebyfile.mjs

Conversation

Jake Bailey (jakebailey) commented Oct 8, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

Jake Bailey (jakebailey) commented Oct 8, 2026

Uh oh!

typescript-automation Bot commented Oct 8, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

typescript-automation Bot commented Oct 8, 2026

tsc

lsp

startup

Uh oh!

Jake Bailey (jakebailey) commented Oct 15, 2026

Uh oh!

typescript-automation Bot commented Oct 15, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

typescript-automation Bot commented Oct 15, 2026

tsc

Uh oh!

Jake Bailey (jakebailey) commented Oct 15, 2026

Uh oh!

typescript-automation Bot commented Oct 15, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

typescript-automation Bot commented Oct 15, 2026

tsc

Uh oh!

Jake Bailey (jakebailey) commented Oct 27, 2026

Uh oh!

typescript-automation Bot commented Oct 27, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

typescript-automation Bot commented Oct 27, 2026

tsc

Uh oh!

Jake Bailey (jakebailey) commented Oct 27, 2026

Uh oh!

Jake Bailey (jakebailey) commented Oct 28, 2026

Uh oh!

typescript-automation Bot commented Oct 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

typescript-automation Bot commented Oct 28, 2026

tsc

Uh oh!

Jake Bailey (jakebailey) commented Oct 28, 2026

Uh oh!

Jake Bailey (jakebailey) commented Oct 28, 2026

Uh oh!

typescript-automation Bot commented Oct 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

typescript-automation Bot commented Oct 28, 2026

Uh oh!

Jake Bailey (jakebailey) commented Oct 28, 2026

Uh oh!

typescript-automation Bot commented Oct 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

Jake Bailey (jakebailey) Oct 28, 2026

Choose a reason for hiding this comment

Uh oh!

typescript-automation Bot commented Oct 28, 2026

tsc

Uh oh!

Jake Bailey (jakebailey) commented Oct 28, 2026

Uh oh!

typescript-automation Bot commented Oct 28, 2026

Uh oh!

Jake Bailey (jakebailey) commented Oct 28, 2026

Uh oh!

typescript-automation Bot commented Oct 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

typescript-automation Bot commented Oct 28, 2026

tsc

Uh oh!

Jake Bailey (jakebailey) commented Oct 8, 2026 •

edited

Loading

typescript-automation Bot commented Oct 8, 2026 •

edited

Loading

typescript-automation Bot commented Oct 15, 2026 •

edited

Loading

typescript-automation Bot commented Oct 15, 2026 •

edited

Loading

typescript-automation Bot commented Oct 27, 2026 •

edited

Loading

typescript-automation Bot commented Oct 28, 2026 •

edited

Loading

typescript-automation Bot commented Oct 28, 2026 •

edited

Loading

typescript-automation Bot commented Oct 28, 2026 •

edited

Loading

typescript-automation Bot commented Oct 28, 2026 •

edited

Loading

typescript-automation Bot commented Oct 28, 2026 •

edited

Loading