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.
Answered by Luca_65 in 624373022
Code 12 beta 3 fixed the issue.
Accepted Answer
Code 12 beta 3 fixed the issue.
SourceKitService is stalling the iMac
 
 
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