skills/ HoangNguyen0403/agent-skills-standard

flutter-performance

Optimize Flutter widget rebuilds, memory usage, rendering, and scrolling performance. Use when diagnosing jank, reducing rebuilds, or improving list performance—not performance tests, monitoring setup, or API optimization.

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SKILL.md

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Performance

Priority: P1 (HIGH)

  • 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.
  • Keys: Provide ValueKey for list items and stable IDs for reconciliation.
  • Resource Cleanup: Dispose controllers/streams in dispose().
  • Pagination: Default to 20 items per page for network lists.
  • Build Purity: Keep build methods free of heavy work; move logic to BLoC/Application.
  • Image Resizing: Always set maxWidth/maxHeight when loading images.

Anti-Patterns

  • No Root setState(): Use BlocBuilder with buildWhen or context.select() for granular updates
  • No Heavy Business in build(): Move sorting/filtering/heavy logic to BLoC or compute()
  • No Non-const Leaf Nodes: Apply const to all static widgets to skip unnecessary reconciliation
  • No Large Column Lists: Use ListView.builder for efficient item recycling in large lists
BlocBuilder<UserBloc, UserState>(
  buildWhen: (p, c) => p.id != c.id,
  builder: (context, state) => Text(state.name),
)

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