Several older version of Calibre also gave me the same problem "some times", even I set all the Calibre processes priority to low. I still cannot conclude which scenario have caused the problem. But when my notebook became ve....ry...slow (dual core 1.6ghz, 1.5gb mem), I always found some "Calibre-parallel" process was enjoying eating up my NB memory, sometimes upto 1gb. It does not happen everytime I ran Calibre.
So far so good with .20, fingers crossed!
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