Apple Swift/SwiftUI Performance Optimization Best Practices Comprehensive guide for Swift and SwiftUI performance optimization. Contains 19 rules across 3 categories covering modern concurrency, render performance, and animation performance. Targets iOS 26 / Swift 6.2 with @Observable and Swift 6 strict concurrency. Clinic Architecture Contract (iOS 26 / Swift 6.2) All guidance in this skill assumes the clinic modular MVVM-C architecture: - Feature modules import + only (never , never sibling features) - App target is the convergence point and owns , concrete coordinators, and Route Shell wir…