I solved it by inserting the image with google chrome
Jin_90
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1) For simulators run iOS14, delete folders inside ~/Library/Developer/Xcode/iOS DeviceSupport/ (folder's name started with 14.0).
2) For devices run iOS14, select Xcode window tab, click Devices and Simulators, find your device, right-click to unpair the device
https://stackoverflow.com/questions/63929122/slow-app-launch-time-after-updating-to-ios-14-and-xcode-12