Optimization standards for rebuilds and memory.
Scanned 9/8/2026
Install to Claude Code
Skills Directorynpx -y skills add ngxtm/devkit --skill performance --agent claude-codeInstalls into .claude/skills of the current project.
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---
name: Flutter Performance
description: Optimization standards for rebuilds and memory.
metadata:
labels: [performance]
triggers:
files: ['lib/presentation/**', 'pubspec.yaml']
keywords: [const, buildWhen, ListView.builder, Isolate, RepaintBoundary]
---
# Performance (P1)
- **Rebuilds**: Use `const` widgets and `buildWhen` / `select` for granular updates.
- **Lists**: Always use `ListView.builder` for item recycling.
- **Heavy Tasks**: Use `compute()` or `Isolates` for parsing/logic.
- **Repaints**: Use `RepaintBoundary` for complex animations. Use `debugRepaintRainbowEnabled` to debug.
- **Images**: Use `CachedNetworkImage` + `memCacheWidth`. `precachePicture` for SVGs.
```dart
BlocBuilder<UserBloc, UserState>(
buildWhen: (p, c) => p.id != c.id,
builder: (context, state) => Text(state.name),
)
```
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