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I can't think of anything that could cause more paging in newer releases. That said, in fixing memory leaks I have changed the way object references are stored/garbage collected in various parts of the calibre code and that might be causing this, though I don't know enough about the internals of python's garbage collection/windows memory management to speak with any confidence.
As long as the speed recovers after the initial add of a format, I'm not going to spend more time on this. I will note that I don't notice any post idling slowdown on my linux machine but then that has 6 GB of RAM and linux never pages anything unless it really has to.
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