I have had a problem with xcode 9.
It turns out that I have a project in swift 3, I have it on a mac and the xcodeone where it was created was around 6, but on the same mac it has been updated xcodefrom the store until it reached 9, the problem is that now on a new mac it xcodeis installed from 0, it is not updated as usual but in xcodewhich the project has just been installed when wanting to visualize storyboardit slows down a lot and gets stuck, it does not let me see for example the view of half and half (View and Controller), then when doing that I have to force stop xcode, the curious thing is that with other projects that were started newer this does not happen and I have no idea what configuration to move, the differences that I see is that in the one xcodeof the previous mac although it has the 9 thesdkit appears as 10.3 and in the new one it only leaves me 11, but in reality I don't know if it is that
Well it's solved, what happened is that I needed to update a POD, from a library I use called FSCalendar, that library had problems when using it in xcode 9 apparently and that's why it got stuck in the storyboard.
Cheers