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flutter-handling-concurrency

Offloads CPU-bound Dart computations to background isolates to prevent UI freezing.

1|Updated Apr 30, 2026
Search Tags:#concurrency#async#flutter#dart#isolate#background processing#ui performance
One-click install
npx skills add https://github.com/Wishtohear/bucket-water-oms --skill flutter-handling-concurrency-wishtohear
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: flutter-handling-concurrency
Source: https://github.com/Wishtohear/bucket-water-oms/tree/main/bucket-water-oms-admin-mobile/skills/flutter-handling-concurrency
Command: npx skills add https://github.com/Wishtohear/bucket-water-oms --skill flutter-handling-concurrency-wishtohear

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Heavy computations like parsing large JSON payloads block Flutter's Main Isolate, causing UI jank and frozen screens. This Skill guides you to choose the right concurrency model and implement background execution correctly. ## Core Features & Use Cases - Decision Matrix: Clear rules for choosing between async/await, Isolate.run(), and Isolate.spawn() based on whether tasks are I/O-bound or CPU-bound. - Short-Lived Isolates: Offload one-off heavy computations using Isolate.run() with Dart 2.19+. - Long-Lived Worker Isolates: Establish persistent bidirectional communication using ReceivePort and SendPort for continuous background processing. - Use Case: When your Flutter app freezes while decoding a massive JSON response from an API, use Isolate.run() to parse it in a worker isolate and keep the UI responsive. ## Quick Start Ask the AI to refactor a heavy JSON parsing function in your Flutter app to run in a background isolate using Isolate.run.

Frequently Asked Questions about flutter-handling-concurrency

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

FAQPage Schema
How do I run heavy computations in the background in Flutter?▼

Use Isolate.run() for one-off CPU-bound tasks in Dart 2.19+. Extract the computation into a standalone callback function, pass it to Isolate.run(), and await the result on the Main Isolate without blocking the UI.

When should I use async/await vs isolates in Dart?▼

Use async/await for I/O-bound tasks like network requests and file access, and for CPU tasks under 16ms. Use isolates only for CPU-bound work that takes significant time, since isolates have separate memory and communicate via message passing.

How do I create a long-lived worker isolate in Dart?▼

Spawn the isolate with Isolate.spawn(), passing the Main Isolate's SendPort. The worker creates its own ReceivePort and sends its SendPort back, enabling continuous bidirectional message passing between both isolates.

Why does my Flutter UI freeze when parsing large JSON?▼

JSON decoding runs on the Main Isolate by default, blocking UI rendering for large payloads. Move the decode call into Isolate.run() so parsing happens in a worker isolate while the Main Isolate continues handling frames.

How do I prevent memory leaks with Dart isolates?▼

Close all ReceivePort instances and kill spawned isolates when they are no longer needed. Implement a dispose method that calls close() on ports and kill() on the isolate reference.

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