The strange thing is that it is not all of Windows that is slowing down. Apps that are already running are fine. It is just when I try to copy/paste files between Explorer Windows while Calibre is adding books the Explorer windows involved in the copy/paste seem to hang. All other windows (and even some with long-running copy operations) continue to run fine. Other Explorer windows are also fine as long as I do not attempt a copy/paste type operation.
I am quite prepared to believe that it is an idiosyncrasy of Windows Explorer - it was just strange that specific operations in one app (calibre) can have the effect they do on another one (Explorer). These are not things one should see in a proper multi-tasking OS. I am guessing that there is some mutext or something like that that the apps are fighting over.
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