Memory Optimization for Mobile Apps

Mobile devices have limited RAM. Memory leaks and excessive allocations cause crashes and poor performance.

Image Optimization: Use react-native-fast-image with caching. Resize images before displaying. Use WebP format when possible. Implement progressive loading for large images.

List Virtualization: Always use FlatList or FlashList for long lists. Set removeClippedSubviews={true} and optimize windowSize. Implement getItemLayout when item heights are known.

Memory Leaks: Avoid closures that capture large objects. Unsubscribe from listeners and timers. Use WeakMap for caches. Profile with Xcode Instruments or Android Profiler.

Large Datasets: Paginate API responses. Use cursor-based pagination. Implement infinite scroll with proper cleanup. Cache only what's needed.

Component Cleanup: Clean up in useEffect return functions. Cancel pending promises. Remove event listeners. Clear intervals and timeouts.

State Management: Avoid storing large objects in global state. Use selectors to compute derived data. Normalize nested data structures.

Monitor memory usage in production. Set up crash reporting to catch OOM errors.