Reply to Xcode 12 is slow when launching apps (even sample projects) defaults delete com.apple.dt.Xcode rm -rf $HOME/Library/Application\ Support/Developer/Shared/Xcode rm -rf $HOME/Library/Saved\ Application\ State/com.apple.dt.Xcode.savedState rm -rf $HOME/Library/Preferences/com.apple.dt.Xcode.* Developer Tools & Services Xcode May ’21