well log out, log in launch did not trigger any freeze.
services: I count 10 which are manual and started before launching calibre and 10 after launching calibre. so no new process initiated, ( but discount that result as there was not freeze - need to repeat it after a reboot).
CPU: I see a brief spike into the 90% zone but that's quite normal for a program launch
so to test each hypothesis requires a full reboot, it seems
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