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MimicHunterZ
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flutter-performance

Analyze Flutter UI and Raster thread jank using Flutter DevTools and integration tests.

56|4|Updated Oct 29, 2025
Search Tags:#performance#optimization#profiling#devtools#flutter#jank
One-click install
npx skills add https://github.com/MimicHunterZ/PocketMind --skill flutter-performance-mimichunterz
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: flutter-performance
Source: https://github.com/MimicHunterZ/PocketMind/tree/main/.claude/skills/flutter-performance
Command: npx skills add https://github.com/MimicHunterZ/PocketMind --skill flutter-performance-mimichunterz

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill helps developers identify and fix performance bottlenecks in their Flutter applications, ensuring a smooth and responsive user experience.

Core Features & Use Cases

  • Jank Detection: Pinpoints performance issues on the UI and Raster threads.
  • Optimization Strategies: Provides specific code refactoring advice for common performance problems.
  • Baseline Measurement: Guides the creation of integration tests to establish performance metrics.
  • Use Case: A developer notices their Flutter app stutters when scrolling a long list. They use this Skill to profile the app, identify that the UI thread is overloaded due to expensive build methods, and refactor their widgets to use const constructors and localize setState.

Quick Start

Run the flutter drive command with the provided driver and target to capture scrolling performance metrics.

Frequently Asked Questions about flutter-performance

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I fix Flutter app jank and achieve a 16ms frame budget?▼

To fix Flutter jank and achieve a 16ms frame budget, profile the app in `--profile` mode using Flutter DevTools to pinpoint UI and Raster thread bottlenecks, then apply rendering and state management optimizations.

Why does my Flutter app stutter when scrolling a long list?▼

Flutter scrolling stutters when the UI thread is overloaded by expensive build methods. You can resolve this by refactoring widgets to use `const` constructors and localizing `setState` to prevent unnecessary rebuilds.

How do I establish a performance baseline for my Flutter application?▼

Establish a Flutter performance baseline by creating integration tests with specific driver and target implementations. Run the `flutter drive` command to capture scrolling metrics and measure your app's rendering performance.

Does Flutter performance profiling require a specific build mode?▼

Yes, Flutter performance profiling requires running the application in `--profile` mode. This mode preserves performance characteristics while enabling DevTools to accurately detect UI and Raster thread jank.

What is the best way to profile Flutter rendering and layout performance?▼

The best way to profile Flutter rendering and layout performance is using Flutter DevTools. It analyzes UI and Raster threads to identify bottlenecks, guiding specific code refactoring advice for rendering and state management.

When should I localize setState to optimize Flutter performance?▼

Localize `setState` when optimizing Flutter performance to prevent expensive widget rebuilds. Pushing state changes down to smaller widgets reduces the UI thread load, helping maintain the 16ms frame budget during interactions.

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