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android-performance

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Optimize Android app startup, UI rendering, and frame stability with Baseline Profiles and lazy initialization. Use when reducing startup time, diagnosing jank, or improving rendering performance.

Design

What this skill does

# 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](references/implementation.md) 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](references/implementation.md) 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](references/implementation.md)

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