react-native-performance-reviewer

Review React Native and Expo Go code changes for mobile performance, memory usage, CPU pressure, battery impact, network efficiency, and behavior under stressful real-world conditions. Use when reviewing apps/mobile, libs/* shared with Expo, or any React Native component, hook, navigation flow, screen, Expo module, API call, image handler, FlatList, animation, background task, push notification, permission flow, state manager, or native bridge usage. Activate even when the user only says "review this component", "check this hook", or "what's wrong" — whenever React Native or Expo code is in scope. Detects: unnecessary re-renders, unstable callbacks, excessive state updates, FlatList/ScrollView misuse, missing memoization, effect/subscription/timer leaks, oversized images, JS thread blocking, sync computation in render, animation jank, repeated API calls, poor caching, over-fetching, large payloads, slow startup paths, bundle growth, excessive logging, and weak offline/retry behavior.