Unblocking The Main Thread: Solving ANRs and Frozen Frames
summary
Shows concrete fixes and measurements: uses Firebase Performance, R8, LeakCanary and a custom jenat trace to find slow spots, shares results like reduced thread count from 180 to 130 by sharing thread pools, and finds okhttp/encrypted‑prefs initialization that took 300ms costing 900ms across features, then moves that work off the main thread or lazy‑inits it. Presents baseline profiles and A/B tests, reports time‑to‑interactive falling from ~12s with measurable gains after each change.
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chapters (18)
- 0:00Main thread performance issues
- 3:15Slow rendering and frozen frames
- 6:04ANRs impact on UX
- 8:12Measuring performance in production
- 10:35No single optimization solution
- 11:20Offload work with coroutines
- 13:26Thread pools to reduce memory
- 15:11Startup time with R8 and ProGuard
- 17:20Detecting memory leaks
- 20:26Preventing DI memory leaks
- 21:49Lazy initialization for startup
- 24:16Optimize resources with WebP and Vector Drawables
- 25:40Compose optimizations and recomposition
- 29:12Baseline profiles for faster startup
- 31:36Validating optimizations in production
- 32:39Profiling hidden bottlenecks
- 34:03Android performance retrospective
- 38:39Closing remarks
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