swiftui-performance-audit

Audit SwiftUI view bodies and state dependencies to diagnose performance issues.

3.9k|203|Updated Dec 30, 2025
One-click install
npx skills add https://github.com/Dimillian/Skills --skill swiftui-performance-audit-dimillian
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: swiftui-performance-audit
Source: https://github.com/Dimillian/Skills/tree/main/swiftui-performance-audit
Command: npx skills add https://github.com/Dimillian/Skills --skill swiftui-performance-audit-dimillian

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

SwiftUI apps can suffer from slow rendering, UI hitches, and excessive update churn driven by state changes and complex view hierarchies. This Skill guides you through end-to-end performance triage from code review to informed profiling and remediation.

Core Features & Use Cases

  • Code-First Review: Start with the target view code to identify root causes such as unstable identities, layout thrash, and heavy work inside body.
  • Instrument-guided Profiling: Use Instruments SwiftUI templates to capture updates, Time Profiler, and hangs/hitches, then map findings to concrete fixes.
  • Remediation Patterns: Propose targeted changes like localizing state, caching expensive computations, reducing layout complexity, and simplifying view hierarchies to shrink update fan-out.
  • Use Case: When a screen scrolls jerkily or exhibits CPU/memory spikes, apply this Skill to diagnose the root cause and craft an actionable remediation plan.

Quick Start

Provide your SwiftUI view code or a detailed symptom description to begin the Code-First Review.

Frequently Asked Questions about swiftui-performance-audit

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

FAQPage Schema
Why does my SwiftUI view body re-render excessively and cause UI hitches?

SwiftUI performance issues like UI hitches and excessive re-renders often stem from unstable view identities, broad state dependencies, or heavy computations executed inside the body. Auditing view code helps identify these root causes and localize state to shrink update fan-out.

How do I diagnose slow rendering and high CPU usage in my SwiftUI app?

To diagnose slow SwiftUI rendering and high CPU usage, start with a code-first review to spot layout thrash, then use Instruments SwiftUI templates and Time Profiler to capture updates and map hangs to concrete remediation steps.

What is the best way to profile SwiftUI update propagation and state dependencies?

The best way to profile SwiftUI update propagation is combining code review of state dependencies with Instruments traces, capturing view body executions to pinpoint unstable identities and apply patterns like caching expensive computations.

Can I fix SwiftUI memory spikes by moving heavy work out of the view body?

Yes, fixing SwiftUI memory spikes involves moving heavy work out of the view body. Caching expensive computations, localizing state, and simplifying view hierarchies reduce update churn and stabilize resource usage during rendering.

Does this SwiftUI performance audit work for layout thrash and complex view hierarchies?

Yes, this SwiftUI performance audit handles layout thrash and complex view hierarchies by analyzing view bodies and update propagation, then proposing targeted changes to reduce layout complexity and stabilize identities.