Xcode 9 promised a lot, but for me it has been a big disappointment. SourceKitService still ends up in an endless loop allocating memory and needs to be kill -9

Xcode 9 promised a lot, but for me it has been a big disappointment. SourceKitService still ends up in an endless loop allocating memory and needs to be kill -9'd every 10 minutes. Switching git branches with a storyboard open often trips up Xcode and just now crashed my Mac completely. Apple software quality is not what it used to be.