Standards for Baseline Profiles, Startup Time, and UI Rendering. Use when optimizing app startup, jank, or UI rendering performance in Android. (triggers: **/*Benchmark.kt, **/*Initializer.kt, BaselineProfile, JankStats, recomposition)
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---
name: android-performance
description: "Standards for Baseline Profiles, Startup Time, and UI Rendering. Use when optimizing app startup, jank, or UI rendering performance in Android. (triggers: **/*Benchmark.kt, **/*Initializer.kt, BaselineProfile, JankStats, recomposition)"
---
# Android Performance Standards
## **Priority: P1**
## Implementation Guidelines
### Startup Time
- **Baseline Profiles**: Mandatory for all production apps to pre-compile critical paths (improves startup by 30-40%).
- **Lazy Initialization**: Defer heavy SDK init using `App Startup` or lazy Singletons. Avoid blocking `Application.onCreate`.
### UI Performance
- **Recomposition**: Use "Layout Inspector" to find unnecessary recompositions.
- **Images**: Use Coil/Glide with proper caching and resizing (`.crossfade()`).
- **Lists**: `LazyColumn` must use `key` and stableitem classes.
## 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
- [Baseline & Startup](references/implementation.md)
