perf: speed up Python stack capture#3147
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dgozman
approved these changes
Jul 23, 2026
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2.0–2.6× faster Playwright calls under pytest; 1.2–1.7× faster standalone.
This replaces
inspect.stack(0)with directf_backtraversal. It still captures the full stack, but avoids eagerly constructingFrameInfoobjects and inspecting source context on every API call.Paired
page.evaluate("1")benchmarks on Python 3.12:The difference is larger under pytest because its runner stack is deeper.
Re #2836.