sync-worker.exe
There is another post asking about the file sync-worker.exe which appears in Activity Monitor and can be there several times. In my case, of late, it is making my computer unusable as it it hogging all the CPU power.
A responder to the original message said these are Windows executable files and asked the original poster if he was running a Windows emulator.
In looking at the screen capture, I see this issue. It isn't a Windows emulator but it is caused by the sync app. This is a new problem though, as the sync service, at least in my experience, has worked well for years.
To clarify, we are talking about sync as in https://www.sync.com
Their Mac app creates a sync folder in Finder. It would appear that either there have been changes to their app or to the MacOS that are creating issues.
As it stands now, my iMac is unusable. I can't even copy a file without the system hanging.
iMac Line (2012 and Later)