swiftui-macos-performance

What problem does it solve?

This Skill resolves common performance issues in macOS SwiftUI apps, including janky scrolling, main thread freezes, excessive memory usage from redundant view redraws, and slow rendering of large datasets like 10k+ row tables.

Core Features & Use Cases

• Redundant Redraw Prevention: Use EquatableView and granular @Observable state to eliminate unnecessary view body re-evaluations.
• Large Dataset Optimization: Implement lazy Table, LazyVStack, and LazyVGrid patterns to handle 10k+ rows with minimal memory overhead and smooth 60fps scrolling.
• Timed Updates: Use TimelineView for efficient, scheduled view updates for clocks, progress indicators, and real-time data displays without excessive main thread load.
• Profiling & Debugging: Use Xcode Instruments (Hangs, Time Profiler, SwiftUI template) to identify main thread stalls, slow view bodies, and layout thrash.
• Concurrency Tuning: Batch MainActor hops and move heavy computation off the main thread to reduce responsiveness issues.
• Use Case: A macOS dashboard app with a 50,000-row data table and real-time updating charts that previously froze during interaction can use this Skill to implement lazy loading, EquatableView for chart subtrees, batched main actor updates, and TimelineView for scheduled refreshes to restore smooth performance.

Quick Start

Use the swiftui-macos-performance skill to fix stuttering scroll and main thread freezes in your macOS SwiftUI app with large datasets and real-time views.