Can it help fix laggy scrolling in lists?

Yes, it implements WWDC 2025 patterns for List performance and nested ScrollViews that can result in up to 16x faster updates for large datasets.

What are 'Long View Body Updates'?

These are instances where a SwiftUI view's body property takes too long to compute, causing the app to miss frame deadlines and resulting in visible UI stutters or hitches.

How does this skill help with Instruments 26?

It provides a guided workflow for interpreting the new SwiftUI Instrument lanes, including Long View Body Updates, color-coded severity levels, and the Cause & Effect Graph.

Which Apple platforms are supported?

The skill is optimized for iOS 26+, iPadOS 26+, macOS Tahoe+, and axiom-visionOS 3+.

SwiftUI Performance Optimizer (Axiom)

Name: SwiftUI Performance Optimizer (Axiom)
Author: CharlesWiltgen

byCharlesWiltgen

•

233

Mobile Development

Optimizes SwiftUI applications by identifying UI bottlenecks, reducing view body complexity, and implementing WWDC 2025 performance patterns.

概要

This skill provides domain-specific guidance for diagnosing and fixing performance regressions in modern Apple platform apps using Instruments 26 and Xcode 26. It helps developers resolve UI hitches, improve list scrolling responsiveness, and minimize unnecessary view updates by applying advanced cause-and-effect analysis to data flow. Whether you are dealing with large datasets in macOS Tahoe or complex nested ScrollViews in iOS 26, this skill utilizes production-tested patterns to ensure your app maintains a fluid 120Hz frame rate and efficient CPU usage.

主な機能

Optimization of large List views for 6x faster loading
233 GitHub stars
Instruments 26 & Xcode 26 diagnostic integration
Nested ScrollView and Lazy Stack performance patterns
Cause & Effect Graph analysis for data flow troubleshooting
View body complexity reduction and @Sendable optimization

ユースケース

Scaling data-heavy lists to handle 100,000+ items without performance loss
Profiling slow view body updates using the color-coded SwiftUI Instrument
Eliminating dropped frames and scrolling lag in ProMotion-enabled devices

概要

主な機能

Optimization of large List views for 6x faster loading
233 GitHub stars
Instruments 26 & Xcode 26 diagnostic integration
Nested ScrollView and Lazy Stack performance patterns
Cause & Effect Graph analysis for data flow troubleshooting
View body complexity reduction and @Sendable optimization

ユースケース

Scaling data-heavy lists to handle 100,000+ items without performance loss
Profiling slow view body updates using the color-coded SwiftUI Instrument
Eliminating dropped frames and scrolling lag in ProMotion-enabled devices