React Native Performance Optimization: Rendering at 60 FPS and Memory Management

Guaranteeing fluid animations at 60 FPS and smooth transitions in mobile applications built with React Native requires a deep understanding of the interaction between the JavaScript thread and native threads.

### 1. New Architecture: Fabric and TurboModules The legacy architecture relied on a serialized, asynchronous JSON bridge. The new architecture uses JSI (JavaScript Interface), allowing JS code to synchronously invoke native methods written in C++, bypassing serializing overhead and bottlenecks.

### 2. Cell Recycling with Shopify FlashList The legacy FlatList computes layout dynamically and retains offscreen cells in memory. Implementing Shopify's FlashList recycles native views on the fly, delivering stable and frame-perfect rendering for high-density lists.

### 3. Prevention of Memory Leaks Ensure active cleanup of event listeners in useEffect and avoid retain cycles in closures. Using Xcode Profiler and Flipper is indispensable to monitor heap allocation and prevent unexpected Out-Of-Memory (OOM) app crashes.