Does it support the modern Swift Observation framework?

Yes, it analyzes @Observable models and state flow to ensure granular updates and minimize unnecessary view invalidation storms across the hierarchy.

How does this skill find performance issues?

It uses a code-first approach to identify anti-patterns like expensive formatters in the view body or unstable identities, providing Instruments guidance if source analysis is inconclusive.

Can it fix 'janky' scrolling in my iOS app?

Yes, it specializes in diagnosing list churn, layout thrash, and identity instability which are the primary causes of scroll stutter in SwiftUI.

Do I need to provide an Instruments trace file immediately?

No. The skill starts with a code review. It only requests Instruments traces or screenshots if the root cause cannot be determined by looking at the source code alone.

SwiftUI Performance Auditor

Name: SwiftUI Performance Auditor
Author: lev-os

bylev-os

0•

Mobile Development

Diagnoses and resolves SwiftUI performance bottlenecks like janky scrolling, excessive view updates, and high memory usage through code analysis and profiling guidance.

This skill provides an end-to-end workflow for optimizing SwiftUI applications, moving from initial code review to deep-dive instrumentation. It helps developers identify common performance 'code smells'—such as expensive work inside view bodies or unstable list identities—and provides actionable remediation steps. When code inspection isn't enough, it guides users through the Apple Instruments profiling process to capture and analyze SwiftUI timelines, ensuring apps remain responsive, energy-efficient, and smooth.

主な機能

010 GitHub stars

02Comparative performance tracking to verify improvements after refactoring.

03Automated detection of SwiftUI 'code smells' like heavy computations in view bodies.

04Remediation strategies for layout thrash, image downsampling, and unstable identities.

05Step-by-step guidance for using Apple Instruments and the SwiftUI template.

06Diagnosis of view invalidation storms and state management inefficiencies.

ユースケース

01Reducing high CPU and battery drain caused by excessive or redundant view re-renders.

02Debugging 'janky' scrolling and frame drops in complex SwiftUI Lists or LazyVStacks.

03Optimizing memory usage when handling large image assets or complex observable data structures.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add lev-os/agents swiftui-performance-audit

For use in Claude.ai and ChatGPT

Download Skill