android-performance

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

• Baseline & Startup