React Native uses a bridge to connect JavaScript and native code. This bridge can slow down UI updates if many messages pass through it, causing frame drops below 60fps. The new architecture reduces this overhead by using a direct communication layer, improving smoothness and lowering CPU use. Memory use is also optimized, helping battery life on mobile devices.
To keep your app running at 60fps, minimize heavy work on the JavaScript side and avoid sending large data over the bridge. Use the new architecture with TurboModules and Fabric UI Manager to reduce bridge traffic. Also, batch updates and use native animations where possible to keep UI smooth.
The new architecture can slightly increase app size due to added native modules but improves startup time by initializing components more efficiently. Keep your JavaScript bundle small and lazy-load features to reduce initial load time and memory use.
Both platforms benefit from the new architecture, but implementation details differ. iOS uses Objective-C/Swift native modules, while Android uses Java/Kotlin. The bridge and new architecture components are optimized per platform. iOS apps require code signing and provisioning profiles, while Android apps need APK or AAB signing. Performance gains are similar but test on both platforms to catch platform-specific issues.
Ensure your app complies with Apple's Human Interface Guidelines and Google Play policies. Avoid excessive background processing that drains battery. Use proper permissions for native features. For iOS, ensure your app is signed correctly and supports required device architectures. For Android, use the latest SDK targets and sign your app bundle properly.
Your React Native app takes 5 seconds to load a screen. What's likely wrong?