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It is entirely natural that calibre components currently running will take up memory, but they shouldn't be left behind after you close calibre.
I don' know what precisely they may be doing (calibre-parallel is the calibre worker processes that carry out miscellaneous "stuff") but they are most likely doing something. To put it in perspective -- I don't think I've ever seen calibre running and NOT seen at least one calibre-parallel process as well.
Is it slowing down your system?
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