Pretty sure I only see more than one parallel.exe when calibre is doing jobs (conversions, word counts etc)
I have Prefs->Misc->Max simultaneous... jobs set to 1. I did some tests, and satisfied myself that doing what I do, on my rig, it is significantly faster to do 4 jobs serially that it is to do the same 4 jobs in parallel - and while they're chugging along I can do something else.
BR
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