Changing the priority to low does not reduce the overall load. What it does mean is that the calibre processes only run if other higher priority applications do not want to run. Since most applications run at 'normal' priority and do not also tie up the CPU the user experience is that the system is more responsive. Calibre is still consuming as much resource as is not used by higher priority applications, but now it is not done at the cost of degrading other applications of normal priority.
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