Xcode 12.1 takes over a minute to launch app and attach debugger to iPhone XS running iOS 14.1

I upgraded my gear to the public releases for Xcode 12.1 and iOS 14.1 this week. After the upgrades, now whenever I select my iPhone Xs as my run target destination and run ANY project, it takes over a minute to launch my app and attach the debugger to it. I use OSLog directly in didFinishLaunching as my benchmark for launch time as well as the time graph when viewing the energy tab.

The behavior is that springboard will launch to my launch storyboard, but then sit there waiting for over a minute before my console statements finally start going, the screen renders to my first view, and the debugger attaches.

The strange part is that I can see the energy diagnostics attaching to the phone and it is around the 1:20 mark that things connect and the app finally runs. Also of note, I saw the phone transition to the "serious" thermal state while playing this waiting game a few times in a row so something appears to be thinking real hard.

This does NOT happen on my iPad Pro running 14.1, nor my iPhone SE 2020 running 14.0--seems isolated to my Xs with 14.1 public release.

Has anyone else experienced similar issues? I created FB8818402 for this issue
Answered by edorphy in 642220022
Blowing away the device support folder for the device in question appears to have resolved my issues. Followed the recommendation from here.
Accepted Answer
Blowing away the device support folder for the device in question appears to have resolved my issues. Followed the recommendation from here.
Xcode 12.1 takes over a minute to launch app and attach debugger to iPhone XS running iOS 14.1
 
 
Q