diff --git a/.github/workflows/code_analysis.yaml b/.github/workflows/code_analysis.yaml
index 7a9374bc..abf35b6d 100644
--- a/.github/workflows/code_analysis.yaml
+++ b/.github/workflows/code_analysis.yaml
@@ -36,6 +36,10 @@ jobs:
                         name: 'Tests'
                         run: vendor/bin/phpunit
 
+                    -
+                        name: 'Bench'
+                        run: php bench/does_not_perform_assertion_lifecycle_bench.php
+
         name: ${{ matrix.actions.name }}
         runs-on: ubuntu-latest
         timeout-minutes: 10
diff --git a/bench/does_not_perform_assertion_lifecycle_bench.php b/bench/does_not_perform_assertion_lifecycle_bench.php
new file mode 100644
index 00000000..dbfa0808
--- /dev/null
+++ b/bench/does_not_perform_assertion_lifecycle_bench.php
@@ -0,0 +1,137 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Benchmark for AddDoesNotPerformAssertionToNonAssertingTestRector on test classes with deep parent chains.
+ *
+ * Each test class has parent lifecycle hooks (setUp(), tearDown()) and parent::test*() calls. Resolving these
+ * via AstResolver parses and decorates parent files on first use, so this bench measures one cold pass, as in a real run.
+ *
+ * Run on both branches to compare. CPU (user+sys) is the reliable metric; wall is noisy.
+ */
+
+use PhpParser\Node\Stmt\ClassMethod;
+use Rector\DependencyInjection\LazyContainerFactory;
+use Rector\PhpParser\Node\BetterNodeFinder;
+use Rector\PHPUnit\PHPUnit60\Rector\ClassMethod\AddDoesNotPerformAssertionToNonAssertingTestRector;
+use Rector\Testing\TestingParser\TestingParser;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+const CHAINS = 10;          // independent base class chains
+const DEPTH = 4;            // abstract parents per chain, between TestCase and the test class
+const TESTS_PER_CHAIN = 30; // test classes extending the deepest parent of each chain
+const TEST_METHODS = 5;     // non-asserting test methods per test class
+const FILLER_METHODS = 15;  // extra methods per parent class, to make parsing realistic
+const MAX_CPU_SECONDS = 1.0; // fails in CI above this
+
+$directory = sys_get_temp_dir() . '/rector_phpunit_bench_' . getmypid();
+@mkdir($directory);
+
+$writeClass = static function (string $className, string $body) use ($directory): string {
+    $filePath = $directory . '/' . $className . '.php';
+    file_put_contents($filePath, "<?php\n\nnamespace Bench;\n\n" . $body);
+    return $filePath;
+};
+
+// make generated classes visible to PHPStan reflection
+spl_autoload_register(static function (string $class) use ($directory): void {
+    if (! str_starts_with($class, 'Bench\\')) {
+        return;
+    }
+
+    $filePath = $directory . '/' . substr($class, 6) . '.php';
+    if (is_file($filePath)) {
+        require_once $filePath;
+    }
+});
+
+$testFilePaths = [];
+
+for ($chain = 0; $chain < CHAINS; ++$chain) {
+    $parentClassName = '\PHPUnit\Framework\TestCase';
+
+    for ($level = 0; $level < DEPTH; ++$level) {
+        $className = sprintf('AbstractChain%dLevel%d', $chain, $level);
+
+        $methods = "    protected function setUp(): void\n    {\n        parent::setUp();\n        \$this->prepare{$level}();\n    }\n\n";
+        $methods .= "    protected function tearDown(): void\n    {\n        \$this->cleanup = null;\n        parent::tearDown();\n    }\n\n";
+        $methods .= "    public function testInherited(): void\n    {\n        \$value = {$level};\n    }\n\n";
+        $methods .= "    private function prepare{$level}(): void\n    {\n        \$this->ready = true;\n    }\n\n";
+
+        for ($filler = 0; $filler < FILLER_METHODS; ++$filler) {
+            $methods .= "    protected function helper{$filler}(array \$items): array\n    {\n        return array_map(fn (\$item) => \$item * {$filler}, \$items);\n    }\n\n";
+        }
+
+        $writeClass(
+            $className,
+            "abstract class {$className} extends {$parentClassName}\n{\n    protected \$ready;\n    protected \$cleanup;\n\n{$methods}}\n"
+        );
+
+        $parentClassName = $className;
+    }
+
+    for ($test = 0; $test < TESTS_PER_CHAIN; ++$test) {
+        $className = sprintf('Chain%dTest%d', $chain, $test);
+
+        $methods = "    public function testInherited(): void\n    {\n        parent::testInherited();\n    }\n\n";
+        for ($testMethod = 0; $testMethod < TEST_METHODS; ++$testMethod) {
+            $methods .= "    public function testSomething{$testMethod}(): void\n    {\n        \$value = \$this->helper{$testMethod}([1, 2, 3]);\n    }\n\n";
+        }
+
+        $testFilePaths[] = $writeClass(
+            $className,
+            "final class {$className} extends {$parentClassName}\n{\n{$methods}}\n"
+        );
+    }
+}
+
+$rectorConfig = (new LazyContainerFactory())->create();
+$rectorConfig->boot();
+
+/** @var TestingParser $testingParser */
+$testingParser = $rectorConfig->make(TestingParser::class);
+
+/** @var BetterNodeFinder $betterNodeFinder */
+$betterNodeFinder = $rectorConfig->make(BetterNodeFinder::class);
+
+$rector = $rectorConfig->make(AddDoesNotPerformAssertionToNonAssertingTestRector::class);
+
+// parse test files up front, parent files are left for the rule to resolve
+$classMethods = [];
+foreach ($testFilePaths as $testFilePath) {
+    $stmts = $testingParser->parseFileToDecoratedNodes($testFilePath);
+    $classMethods = [...$classMethods, ...$betterNodeFinder->findInstanceOf($stmts, ClassMethod::class)];
+}
+
+$cpuSeconds = static function (): float {
+    $usage = getrusage();
+    return $usage['ru_utime.tv_sec'] + $usage['ru_utime.tv_usec'] / 1_000_000
+        + $usage['ru_stime.tv_sec'] + $usage['ru_stime.tv_usec'] / 1_000_000;
+};
+
+$wallStart = microtime(true);
+$cpuStart = $cpuSeconds();
+
+$changedCount = 0;
+foreach ($classMethods as $classMethod) {
+    if ($rector->refactor($classMethod) instanceof ClassMethod) {
+        ++$changedCount;
+    }
+}
+
+$cpu = $cpuSeconds() - $cpuStart;
+$wall = microtime(true) - $wallStart;
+
+array_map('unlink', glob($directory . '/*.php'));
+@rmdir($directory);
+
+printf('test classes: %d, test methods: %d, changed: %d%s', count($testFilePaths), count($classMethods), $changedCount, PHP_EOL);
+printf('CPU:  %.4f s  (%.3f ms/method)%s', $cpu, $cpu / count($classMethods) * 1000, PHP_EOL);
+printf('wall: %.4f s%s', $wall, PHP_EOL);
+
+if ($cpu > MAX_CPU_SECONDS) {
+    printf('CPU %.4f s is over the %.1f s limit%s', $cpu, MAX_CPU_SECONDS, PHP_EOL);
+    exit(1);
+}