React Native Performance Tips

Building performant React Native apps requires attention to detail. Here are proven techniques for optimization.

Avoid Unnecessary Re-renders

Use React.memo and useCallback to prevent unnecessary re-renders:

const MemoizedComponent = React.memo(({ data }) => {

  return {/* render data */};
});

Optimize Lists

FlatList is your friend for long lists. Always provide keyExtractor and optimize with:

removeClippedSubviews

maxToRenderPerBatch

windowSize

Image Optimization

Use appropriate image sizes

Implement caching with libraries like react-native-fast-image

Use WebP format when possible

JavaScript Thread Optimization

Heavy computations should be moved off the JS thread:

Use InteractionManager for deferred tasks

Consider native modules for intensive operations

Conclusion

Performance optimization is an ongoing process. Profile your app regularly and address bottlenecks as they appear.