swiftui-performance-audit

Diagnoses SwiftUI runtime performance issues and provides code-level remediation.

2|Updated Mar 29, 2026

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

Ready to run

npx skills add https://github.com/NagyVikt/codex-plugins --skill swiftui-performance-audit-nagyvikt

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: swiftui-performance-audit
Source: https://github.com/NagyVikt/codex-plugins/tree/main/plugins/build-ios-apps/skills/swiftui-performance-audit
Command: npx skills add https://github.com/NagyVikt/codex-plugins --skill swiftui-performance-audit-nagyvikt

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This skill addresses performance bottlenecks in SwiftUI applications, such as slow rendering, janky scrolling, high CPU usage, and excessive view updates, by providing a structured diagnostic and remediation framework.

Core Features & Use Cases

Code-First Review: Identifies common performance anti-patterns like broad observation fan-out, unstable identity in lists, and expensive computations within view bodies.
Profiling Guidance: Provides a systematic approach to capturing and interpreting runtime evidence using Apple's Instruments, including the SwiftUI and Time Profiler templates.
Remediation Patterns: Offers actionable refactoring strategies to improve frame rates and reduce memory pressure in complex view hierarchies.

Quick Start

Use the swiftui-performance-audit skill to analyze the provided view code for performance bottlenecks and suggest specific code-level improvements.

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 excessive view updates and rendering hitches in SwiftUI?▼

To fix excessive view updates in SwiftUI, you must identify broad observation fan-out and expensive computations within view bodies. Auditing your code resolves these invalidation storms and stabilizes view identity for smoother rendering.

Why does my SwiftUI app have main-thread hangs and high CPU usage?▼

SwiftUI main-thread hangs occur when heavy computations block the rendering pipeline. Diagnosing these runtime performance issues provides remediation patterns to offload expensive work from the main thread.

What is the best way to profile SwiftUI scrolling performance using Instruments?▼

The best way to profile SwiftUI scrolling performance is using Apple's Instruments with the SwiftUI and Time Profiler templates. Systematic guidance for capturing runtime evidence helps interpret the profiling data.

Can I use this SwiftUI performance audit for macOS application development?▼

Yes, you can use this SwiftUI performance audit for macOS application development. It applies to both iOS and macOS workflows, addressing code-level optimization requirements for complex view hierarchies.

How do I stop SwiftUI list rendering anti-patterns and unstable identity?▼

To stop SwiftUI list rendering anti-patterns, you need to stabilize view identity and refactor broad observation fan-out. Identifying these performance bottlenecks offers actionable refactoring strategies to improve frame rates.