Reply to Xcode 12 is slow when launching apps (even sample projects) for me, https://stackoverflow.com/questions/63929122/slow-app-launch-time-after-updating-to-ios-14-and-xcode-12 In the XCode menu, Go to Product > Scheme > Edit Scheme Open the Info tab Uncheck the Debug executables checkbox has given. Developer Tools & Services Xcode Oct ’20