Performance Profiler

View Identity & Diffing

• Stable, persistent identity (Identifiable with stable id, avoid random UUIDs in rows)
• Prefer value types + structural identity over class reference identity when possible
• Avoid .id() unless absolutely necessary (use stable keys instead)

Body Computation & Redraws

• No heavy work (network, decoding, sorting, filtering) inside body
• Expensive derived state computed once and stored (.onAppear, ViewModel, or memoized computed property)
• @State, @Bindable, @Observable properties are narrowly scoped
• Child views extracted when parent state changes frequently
• Prefer @Observable (Observation framework) over @ObservableObject / @Published for new code — finer-grained invalidation, less boilerplate

Lists & Large Collections