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name: android-performance description: Optimize Android app startup, UI rendering, frame stability, and benchmark performance with Baseline Profiles, Macrobenchmark, and lazy initialization. Use when reducing startup time, diagnosing jank, or measuring rendering; defer Compose state API and test-only questions. metadata: triggers: files: - '/*Benchmark.kt' - '/*Initializer.kt' keywords: - BaselineProfile - JankStats - recomposition

Android Performance Standards

Priority: P1 (HIGH)

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

Canonical response anchors

• Additional task-grounded exact anchors: Baseline Profile