Flutter Dart Performance

Core mandate

Apply this skill by default for all Dart or Flutter development. Do not merely produce compiling code; produce code with correct boundaries between Dart work and Flutter rendering.

Use this mental model:

flutter renders and coordinates interaction.
dart performs work, models data, protects shared state, and owns non-ui logic.

Before writing or reviewing code, classify each type as one of: value model, state model, service, repository, parser/mapper, isolate worker, cache, controller/notifier/bloc, widget, or persistence model. The classification should guide annotations, state ownership, async boundaries, and rebuild scope.

Non-negotiable rules