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react-native-performance-optimization

3. How do you handle performance optimization in your React Native development work?​

  • Use PureComponent and memoization: Utilize React.PureComponent, React.memo, and useMemo/useCallback to prevent unnecessary re-renders.
  • Optimize FlatList and SectionList: Use proper keyExtractor, set initialNumToRender, and implement getItemLayout for large lists.
  • Minimize unnecessary renders: Split large components, use context wisely, and avoid passing new props unless needed.
  • Image optimization: Use appropriate image sizes, caching libraries (e.g., react-native-fast-image), and lazy loading.
  • Reduce bridge traffic: Batch state updates, minimize frequent JS-to-native calls, and use native modules efficiently.
  • Enable Hermes engine: Improves JS performance and memory usage on Android.
  • Profile and monitor: Use tools like Flipper, React DevTools, and built-in performance monitors to identify bottlenecks.
  • Optimize animations: Prefer native-driven animations (useNativeDriver: true) with Animated API or libraries like react-native-reanimated.
  • Code splitting and lazy loading: Dynamically load heavy components/screens only when needed.

Regular profiling and iterative optimization are key to maintaining high performance in React Native apps.