Filed feedback FB13380011.
Debugging is slow for me, like others reported, but this Feedback report specifically addresses when Xcode 15 completely hangs while launching an app for debug. It might shed some light on things, and includes a stack trace for Xcode.
This full freeze of Xcode (and the iOS app while connecting to the debugging process) occurs about once every dozen launches. The iOS app being launched hangs on the Launch Screen. Happens across projects, even new ones. When it occurs, Xcode has to be force quit and restarted; same for the iOS app. Then, things work again for awhile.
Hopefully this helps!
adamup
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