Since upgrading my iPhone 13 Pro Max to iOS 26, apps have become nearly impossible to debug. The recent update to iOS 26.1 has made this even worse.
Going from app start to a fully rendered & responding screen takes <1 second on a Debug build when no debugger is attached, but with the debugger attached I get these times (measured manually with a stopwatch):
- First render:
- <1 second without debugger
- 5 seconds on USB debugger
- 30 seconds on wireless debugger
- Data loaded from webserver and UI responding:
- <1 second without debugger
- 19 seconds on USB debugger
- 5 minutes on wireless debugger!
Doing an online speed test reports 55 Mbps for the phone and 60 Mbps on the MacBook, so I doubt it's my WiFi.
Having a debugger attached used to make minimal difference on iOS 18, but the performance has tanked completely since the last major release. What happened?
