From Slow to Flow: Tips for Accelerating Your App Performance
summary
Shows concrete fixes and measurable results: enable Long Function Bodies/Long Expression Type Checking to find slow compile sites, and turn on Enable Bridging PCH for ~30% faster builds in mixed Obj‑C/Swift projects. Use Time Profiler, Leaks and Zombies to spot CPU hotspots, retain cycles (fix by making owner weak) and zombie crashes (Enable Zombie Objects). Filter by thread/state to find hangs, set a 500ms detection threshold in dev, collect MetricKit with dSYMs for production. SwiftUI renders faster (1m15s) but uses ~220MB and pins the main thread; UIKit takes longer (1m25s) but uses ~50MB via cell reuse.
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chapters (15)
- 0:00Intro
- 1:13What happens when the app has some performance issue
- 2:33Agenda
- 3:32Compilation Improvement
- 8:06Profiling Instruments
- 10:12Memory management
- 13:21Leak detection in time profiler
- 14:50What is a ZOMBIE object
- 17:19Hang Detection
- 19:17How to catch hangs
- 23:07How to catch hand in test phase
- 24:56SWIFTUI vs UIKIT
- 25:58Code comparing-swift Ui content view
- 27:01Code comparing-Uikit root view controller
- 27:50SwiftUI app: reporting. Data from time profiler
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