SourceKitService is stalling the iMac

Sometimes it comes back.
SourceKitService is never-ending reading gigabytes from the disk.
There is a so much disk use that Xcode and other application suffer and are sometimes stalled.
I don't think killing it is a good idea but I hope to find a solution to avoid this penalty.

Accepted Reply

Code 12 beta 3 fixed the issue.

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Code 12 beta 3 fixed the issue.