| name | android-performance |
| description | Optimize Android app startup, UI rendering, and frame stability with Baseline Profiles and lazy initialization. Use when reducing startup time, diagnosing jank, or improving UI rendering performance. (triggers: **/*Benchmark.kt, **/*Initializer.kt, BaselineProfile, JankStats, recomposition) |
Android Performance Standards
Priority: P1
1. Accelerate Startup
- Generate Baseline Profiles for all production apps — pre-compiles critical paths (30-40%
startup improvement).
- Defer heavy SDK init using
App Startup or lazy Singletons. Never block Application.onCreate.
See baseline & startup for lazy initialization patterns.
2. Eliminate UI Jank
- Use Layout Inspector to find unnecessary recompositions.
- Load images with Coil/Glide using proper caching and resizing (
.crossfade()).
LazyColumn must use key and stable item classes.
See baseline & startup for LazyColumn optimization.
3. Avoid Layout Bottlenecks
- Replace nested weights with
ConstraintLayout (Views) or Row/Column with Modifier.weight (
Compose).
- Never hold Activity context in Singletons — use Application context to prevent memory leaks.
Anti-Patterns
- No Nested Weights: Use ConstraintLayout (Views) or Row/Column (Compose) instead.
- No Activity Context in Singletons: Use Application context to prevent memory leaks.
References
