[0.85] Backport performance debugging improvements#56637

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motiz88 wants to merge 14 commits intofacebook:0.85-stablefrom

motiz88:pick-perf-debugging-0.85

Commits on Apr 28, 2026

Move base64Encode into react/utils (#55873)

huntie
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motiz88
committed
Move screenshot Base64 encoding to trace serialization (#55803)

huntie
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motiz88
committed
Add tracing helper functions for RNDT traces in C++ and Kotlin (#55935)

rubennorte
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motiz88
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Introduce fuseboxFrameRecordingEnabled flag, gate existing code (#55941)

huntie
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motiz88
committed
Implement Performance frames and screenshots on iOS (#56015)

huntie
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motiz88
committed
Add pixel diffing to RCTFrameTimingsObserver (#56043)

huntie
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motiz88
committed
Add dynamic sampling to frame screenshots (#56048)

huntie
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motiz88
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Switch trace event chunks from event count to size based (#56080)

huntie
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motiz88
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Increase trace screenshot scale factor to 1x (#56079)

huntie
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motiz88
committed
Add Page.captureScreenshot CDP support (#56307)

huntie
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motiz88
committed
Fix data race on PerformanceObserver entry buffer (#56352)

huntie
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motiz88
committed
Add dynamic sampling to frame screenshots (#56135)

huntie
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motiz88
committed
Increase trace screenshot scale factor to 1x (#56136)

huntie
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motiz88
committed
Add missing debugger define for React-RuntimeApple (#56397)

huntie
authored and
motiz88
committed