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tasks/android-production/12-startup-anr.md

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+# 12. App Startup Time & ANR Prevention
+
+meta:
+  id: android-production-12
+  feature: android-production
+  priority: P2
+  depends_on: []
+  tags: [performance, startup, production]
+
+objective:
+- Optimize app startup time and prevent ANRs to ensure smooth user experience
+
+deliverables:
+- Startup time measurement and baseline
+- Lazy initialization of heavy components
+- ANR prevention measures
+- App Startup library integration
+
+steps:
+1. Measure current startup time:
+   - Use Android Studio Profiler
+   - Use Macrobenchmark library
+   - Measure cold start (first launch)
+   - Measure warm start (subsequent launches)
+   - Establish baseline metrics
+2. Optimize Application.onCreate:
+   - Minimize work in KordantApp.onCreate
+   - Use App Startup library for initialization ordering
+   - Defer non-critical initialization
+   - Initialize on background threads where possible
+3. Lazy load heavy components:
+   - Defer TRPCApiService initialization until needed
+   - Lazy load repository dependencies
+   - Defer analytics initialization
+   - Use Dagger/Hilt lazy injection
+4. Optimize theme and layout:
+   - Use simple splash theme (windowBackground only)
+   - Avoid complex layouts in first screen
+   - Preload critical resources
+5. Prevent ANRs:
+   - Move all IO operations to background threads
+   - Use coroutines with Dispatchers.IO
+   - Avoid blocking main thread in composables
+   - Profile with StrictMode in debug builds
+6. Add tests:
+   - Macrobenchmark tests for startup time
+   - ANR detection in CI
+   - Memory usage during startup
+
+tests:
+- Performance: Startup time <1.5s on Pixel 6
+- ANR: No ANRs during critical flows
+- Memory: No memory spikes during startup
+
+acceptance_criteria:
+- Cold startup time <1.5 seconds on Pixel 6
+- Warm startup time <1 second on Pixel 6
+- Splash screen visible for <500ms
+- No blocking operations on main thread during startup
+- Heavy components loaded lazily
+- ANR-free during all critical user flows
+- Macrobenchmark tests for startup time
+- Startup time tracked in CI
+- No StrictMode violations in debug builds
+
+validation:
+- Android Profiler → cold start <1.5s
+- Macrobenchmark → startup metrics within budget
+- StrictMode → no disk/network on main thread
+- Physical device test → feels instant
+- ANR traces → none from Kordant
+
+notes:
+- Android Vitals tracks startup time and ANRs automatically
+- ANR threshold is 5 seconds for input, 10 seconds for BroadcastReceiver
+- App Startup library helps manage initialization order
+- Test on low-end devices (Android 10, 2GB RAM)