Slow app launch time after updating to iOS 14 and Xcode 12

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I have the same problem, but solved this by doing the following things:

For simulators running iOS 14, delete folders inside ~/Library/Developer/Xcode/iOS DeviceSupport/ (folder’s name started with “14”).

For devices running iOS 14, select Xcode window tab, click Devices and Simulators, find your device, right-click to unpair the device

After doing the work, re-run your app, everything should be ok.

References:

  • Apple forum post: Xcode 11 hangs while attaching debugger to ios process
  • StackOverflow answer from: Can I delete data from the iOS DeviceSupport directory?

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