swiftui-performance-audit

Audit SwiftUI code for performance anti-patterns and provide profiling guidance.

Updated Jan 18, 2026

Search Tags:#code review #performance #debugging #optimization #swiftui #instruments

Ready to run

npx skills add https://github.com/cemege/skills-playground --skill swiftui-performance-audit-cemege

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: swiftui-performance-audit
Source: https://github.com/cemege/skills-playground/tree/main/skills/swiftui-performance-audit
Command: npx skills add https://github.com/cemege/skills-playground --skill swiftui-performance-audit-cemege

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill addresses slow rendering, janky scrolling, high CPU/memory usage, and other performance issues in SwiftUI applications by providing code review and profiling guidance.

Core Features & Use Cases

Code Review: Analyzes SwiftUI code for common performance anti-patterns like view invalidation storms, unstable list identities, and heavy computations in body.
Profiling Guidance: Instructs users on how to use Instruments to capture performance traces when code review is insufficient.
Remediation: Offers concrete suggestions for fixing performance bottlenecks, such as optimizing state management, stabilizing list identities, and moving heavy work off the main thread.
Use Case: A developer notices their complex list view is sluggish. They use this Skill to get specific code suggestions for optimizing the list's rendering and data handling, or to learn how to profile it with Instruments.

Quick Start

Use the swiftui-performance-audit skill to review the provided SwiftUI code for performance issues.

Frequently Asked Questions about swiftui-performance-audit

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

FAQPage Schema

How do I fix slow rendering and janky scrolling in SwiftUI?▼

To fix slow rendering and janky scrolling in SwiftUI, audit your code for performance anti-patterns like view invalidation storms, unstable list identities, and heavy computations executed directly within the view body.

Why does my SwiftUI app have high CPU and memory usage?▼

High CPU and memory usage in SwiftUI apps is often caused by excessive view updates and layout thrash. Analyzing your state management and moving heavy work off the main thread can resolve these bottlenecks.

How do I profile SwiftUI performance issues with Instruments?▼

When code review is insufficient to identify SwiftUI performance issues, you can profile your app by using Instruments to capture runtime traces, revealing exact CPU usage, memory allocation, and rendering bottlenecks.

What is the best way to optimize a complex SwiftUI list view?▼

The best way to optimize a complex SwiftUI list view is to stabilize list identities and optimize state management to prevent unnecessary view invalidation, ensuring smooth data handling and rendering.

Can I use this SwiftUI audit for general code review?▼

This audit specifically targets SwiftUI runtime performance issues such as rendering delays, layout thrash, and excessive view updates, rather than providing general Swift code review for architecture or syntax.

What are common SwiftUI performance anti-patterns to avoid?▼

Common SwiftUI performance anti-patterns include view invalidation storms, unstable list identities, and performing heavy computations inside the body property, all of which cause significant rendering lag.