Native App Performance

Use when profiling native macOS or iOS apps with Instruments/xctrace. Covers correct binary selection, CLI arguments, exports, and common gotchas.

Profile and optimize application performance. Use when diagnosing slow code, measuring CPU/memory usage, generating flame graphs, benchmarking functions, load testing APIs, finding memory leaks, or optimizing database queries.

Audit and improve SwiftUI runtime performance from code review and architecture. Use for requests to diagnose slow rendering, janky scrolling, high CPU/memory usage, excessive view updates, or layout thrash in SwiftUI apps, and to provide guidance for user-run Instruments profiling when code review alone is insufficient.

Analyze code performance to identify bottlenecks, detect redundant computations and blocking operations, and provide optimization recommendations.

OpenHarmony React Native performance static checks and optimization. Based on ohos_react_native performance doc. Use when writing or reviewing React Native for OpenHarmony code, bundle-harmony, lifecycle, or TurboModule. Applies to RNAbility, Hermes bytecode, React render optimization.

Building native mobile UIs with Expo Router and React Native. Covers routing, navigation, styling, native controls, animations, and platform conventions following Apple Human Interface Guidelines.