Debugging RN Android Performance
summary
Systrace walkthrough that finds why the UI thread sits below 60 fps even when idle, showing long frames (red Fs) over 16 ms and letting a selection reveal top CPU tasks and thread names. It identifies Lottie animation as an expensive render cost, spots fresco image work and a chrome_in_pogre entry tied to ads in WebView, and reports that optimizing those removes the red frames and restores 60 FPS.
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