Swiftui Performance Audit

The swiftui-performance-audit skill analyzes SwiftUI codebases to identify potential performance bottlenecks and rendering inefficiencies. It scans for common anti-patterns such as excessive view recomposition, heavy computations in body properties, and improper state management that could degrade app responsiveness.

When to use it

• Before launching a production iOS app to ensure smooth frame rates during complex UI interactions.
• During code reviews when evaluating third-party SwiftUI components for hidden performance costs.
• After adding new features involving large datasets or real-time data streams to prevent lag.
• When debugging reported stuttering or jank issues that are difficult to isolate manually.

Key capabilities

• Detects unnecessary view recomposition triggers caused by state changes.
• Identifies heavy calculations performed inside the body rendering block.
• Flags inefficient use of @StateObject, @ObservedObject, and @EnvironmentObject.
• Highlights missing .onAppear or lifecycle optimizations for long-running tasks.

Example prompts

"Run a performance audit on my SwiftUI project to find any views that might cause frame drops." "Analyze this ContentView file for common rendering inefficiencies and suggest fixes." "Check if my real-time stock ticker view is triggering too many recompositions when data updates."

Tips & gotchas

This tool focuses specifically on SwiftUI patterns; it may not catch issues in UIKit or Combine-heavy logic outside of SwiftUI views. For best results, run the audit after completing major feature implementations but before final optimization passes.