In the mobile app world, performance is not a feature — it's a prerequisite. Users abandon apps that take more than 3 seconds to load and uninstall apps that drain their battery or consume excessive data. With app store ratings directly correlated to perceived performance, optimization is a business imperative, not a technical nicety.
Start with Measurement
You can't optimize what you can't measure. Instrument your app with comprehensive performance monitoring (tools like Firebase Performance Monitoring, Datadog Mobile, or custom telemetry) before optimizing anything. Identify your real performance bottlenecks — they're almost never where you think they are.
Network Performance
Network calls are almost always the primary source of perceived latency in mobile apps. Strategies for improvement include aggressive caching (both HTTP caching and local database caching), request batching and deduplication, optimistic UI updates, and progressive loading patterns. GraphQL can significantly reduce over-fetching compared to REST for mobile use cases.
Rendering Performance
On the rendering side, the primary enemies are unnecessary re-renders (in React Native, this means aggressive use of memo, useMemo, and useCallback), large list views without virtualization (FlatList in React Native, LazyColumn in Compose), and expensive layout calculations. Profile your rendering performance with Flipper and the React DevTools profiler.