SwiftUI Performance Tips
summary
Concrete causes and fixes: expensive work in computed properties doing heavy work causes repeated main‑thread slowdowns; Core Data access belongs on background threads and map to lightweight structs; cache authors and batch UI updates with objectWillChange timers to avoid churn; avoid AnyView for lists and prefer generics or a view factory; use lazy stacks correctly and resize large images on a background thread or serve thumbnails from a CDN. Measure with Instruments (Time Profiler, Animation Hitches, SwiftUI profile) and gate regressions with signpost metrics in CI.
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chapters (10)
- 0:00Intro
- 2:37iOS performance metrics
- 4:26Computed variables
- 6:04Database access
- 7:45Frequent redraws
- 10:30Unnecessary data updates
- 13:08AnyView vs Generics
- 17:00Offscreen rendering
- 19:15Using Instruments
- 22:26Performance Testing
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