Same issue for me. I had to do these instructions 2 times before the app would launch without hanging for a minute.
1) Unpair your phone from xcodeLaunch xcode with your phone not plugged in - plug your phone inunder devices in xcode, unpair your phone2) stop xcode
3) run these
rm -rf ~/Library/Developer/Xcode/iOS\ DeviceSupport
rm -rf ~/Library/Developer/Xcode/iOS\ Device\ Logs
rm -rf ~/Library/Developer/Xcode/DerivedData
4) start xcode
5) plug phone in
cabeaulac
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