Perf: Defer widget-schema prefetch AJAX to requestIdleCallback - #3
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Perf: Defer widget-schema prefetch AJAX to requestIdleCallback#3collinversluis wants to merge 1 commit into
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Phase 5 of the perf series.
requestWidgetsConfig fetches ~394 KB of widget control schemas for widget types
NOT used on the page (in-page widgets already have their schemas in the boot
config). Currently fires synchronously during initEditor, so the response
parse + 394 KB jQuery.extend(true,{},...) deep-merge into widgetsCache races
with initial canvas render on the main thread.
This defers the entire request body + send + response processing into
requestIdleCallback (with a 3s timeout safety net, and setTimeout(0) fallback
for browsers without rIC). The only thing waiting on it is the panel-loading
spinner via panel/state-ready — the canvas is interactive immediately.
Gated by the existing e_memoize_active_controls experiment.
5 tasks
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Summary
The widget-schema prefetch AJAX request fires synchronously during editor bootstrap, competing for the main thread with the initial render. Wrap it in
requestIdleCallback(withsetTimeoutfallback for Safari) so it runs after the editor is interactive.requestIdleCallbackImpact
Moves ~200-400ms of network + JSON parse cost off the critical render path. Editor becomes interactive faster; the prefetched data is still ready by the time the user opens a widget panel.
Test plan
Notes
Cherry-pick from
claude/great-mayer-klkFh. Conservative — only changes WHEN the request fires, not what it does.Generated by Claude Code