# Mobile Performance

> App startup, memory management, battery efficiency, network optimization, and profiling tools

- Skill: `gabrielmoreira/mobile-performance` (Agent Skill)
- Install (CLI): `npx skillmds@latest add gabrielmoreira/mobile-performance`
- Raw SKILL.md: https://api.skillmd.com/api/skills/gabrielmoreira/mobile-performance/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: gabrielmoreira (https://skillmd.com/u/gabrielmoreira)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/gabrielmoreira/mobile-performance

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# Mobile Performance

Profile, diagnose, and optimize mobile app performance.

## Key Metrics

| Metric | Target | Tool |
|--------|--------|------|
| Cold Start | <1.5s | Xcode Organizer, Play Console |
| Warm Start | <0.5s | Systrace, os_signpost |
| Frames | 60fps (16ms) | Profile GPU, Perfetto |
| APK/IPA Size | <50MB | size-report, analyzer |
| Memory | <150MB | Xcode Memory Debugger, Memory Profiler |
| Network Latency | <200ms p95 | Proxyman, Charles |

## Startup Optimization

### iOS
- Reduce dynamic framework loading (prefer static libraries)
- Lazy-load non-critical services
- Profile with `Instruments - App Launch`
- Use `dispatch_once` for singletons

### Android
- Apply `App Startup` library for content providers
- Profile with `Android Studio - Startup Profiler`
- Use baseline profiles (Android 12+)
- Defer heavy init to background threads

## Memory Management
- Watch for retain cycles (weak/unowned references)
- Image caching: use NSCache/LruCache with size limits
- Monitor for OOMs in production with crash reporting
- Release view controllers when off-screen

## Network Optimization
- HTTP/2 multiplexing for concurrent requests
- Response caching with ETags
- Prefetch data predictively
- Compress with Brotli or gzip
- Use Protocol Buffers over JSON for large payloads