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tasks/ios-production/12-launch-time.md

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+# 12. App Launch Time Optimization
+
+meta:
+  id: ios-production-12
+  feature: ios-production
+  priority: P2
+  depends_on: []
+  tags: [performance, launch, production]
+
+objective:
+- Optimize app launch time to under 2 seconds for cold starts and under 1 second for warm starts
+
+deliverables:
+- Launch time measurement and baseline
+- Optimized app initialization
+- Lazy loading of heavy components
+- Reduced binary size
+
+steps:
+1. Measure current launch time:
+   - Use Xcode Metrics Organizer
+   - Use os_signpost for custom timing
+   - Measure cold start (first launch after reboot)
+   - Measure warm start (subsequent launches)
+   - Establish baseline metrics
+2. Optimize app delegate:
+   - Minimize work in application(_:didFinishLaunchingWithOptions)
+   - Defer non-critical initialization
+   - Move heavy setup to background threads
+   - Avoid blocking main thread
+3. Lazy load heavy components:
+   - Defer VoicePrint model loading until needed
+   - Defer document scanner initialization
+   - Lazy load WebView components
+   - Load dashboard data after UI appears
+4. Optimize storyboards/XIBs:
+   - Remove unused storyboards
+   - Minimize view controller initialization
+   - Use code-based UI where faster
+5. Reduce binary size:
+   - Strip debug symbols from release builds
+   - Remove unused resources and assets
+   - Compress images in asset catalog
+   - Enable dead code stripping
+6. Optimize framework loading:
+   - Link frameworks statically where possible
+   - Reduce dynamic framework count
+   - Prelink common frameworks
+7. Add launch screen optimization:
+   - Simple, static launch screen
+   - Match first screen of app
+   - No animations or complex layouts
+
+tests:
+- Performance: Measure launch time on iPhone 12
+- Stress: Launch app 100 times, average time <2s
+- Memory: No memory spikes during launch
+
+acceptance_criteria:
+- Cold launch time <2 seconds on iPhone 12
+- Warm launch time <1 second on iPhone 12
+- Launch screen visible for <500ms
+- No blocking operations on main thread during launch
+- Binary size <100MB (App Store limit is much higher)
+- Heavy components loaded lazily after launch
+- Launch time measured and tracked in CI
+- No crashes during launch under memory pressure
+
+validation:
+- Xcode Metrics → cold start <2s, warm <1s
+- Instruments Time Profiler → no long blocking calls on main thread
+- Physical device test → feels instant
+- App Store Connect → binary size acceptable
+
+notes:
+- Launch time is critical for App Store review and user retention
+- iOS may terminate apps with launch times >20 seconds
+- Use pre-warmed launches for more accurate measurement
+- Test on oldest supported device (iPhone SE 2nd gen or similar)