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