react-native-best-practices

Fix React Native FPS drops by profiling first to establish a baseline, then applying Reanimated UI-thread animation patterns and reducing render overhead with concurrent features and atomic state. Validate improvements by re-measuring with the same profiling tools.

The best way to reduce React Native bundle size is to analyze JS bundle contents, avoid barrel exports, and enable tree shaking or code-splitting. This shrinks the app bundle and improves slow time-to-interactive (TTI) startup performance on Hermes and native environments.

Diagnose React Native memory leaks by using profiling-first workflows with DevTools, Instruments, and Profiler to identify increasing memory usage. This safely isolates both JS and native leaks in Hermes, Expo, and native iOS/Android environments before applying fixes.

Yes, this optimization workflow applies to Expo apps, as it explicitly targets Hermes and Expo environments alongside native iOS and Android. It diagnoses rendering, animation, bundle, and memory issues across these platforms using measurement-driven guardrails.

You must profile your React Native app before optimizing because the workflow requires establishing a baseline measurement for FPS drops, TTI, or memory. This profiling-first approach ensures you validate that a single change actually resolves the suspected performance issue.