flutter-performance

name	flutter-performance
description	Optimization standards for rebuilds and memory. Use when this capability is needed.
metadata	{"author":"fierzone"}

Performance

Priority: P1 (OPERATIONAL)

Performance optimization techniques for smooth 60fps Flutter applications.

• 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.

🚫 Anti-Patterns

• Large Rebuilds: **No SetState at Root**: Use granular builders (BlocBuilder, Consumer).
• Logic in Build: **No Heavy Work in body**: Perform parsing/sorting in the Business Layer.
• Missing Const: **No Dynamic Leaf Widgets**: Use const where possible.

BlocBuilder<UserBloc, UserState>(
  buildWhen: (p, c) => p.id != c.id,
  builder: (context, state) => Text(state.name),
)

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Source: fierzone/agent-skills-standard — distributed by TomeVault.