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Xcode crashes when creating core data entity
I had a similar problem: every time I was doing any operation on the CoreData model (e.g. create a new entity and try to save it), it was causing Xcode to freeze and I had to force-quit it.
In my case, my Xcode project folder was synced with Google Drive: as soon as I moved it outside of Google Drive, I was able to use the CoreData model again!