android-performance

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