Yes, I saw that upon further testing. It turned out that I was loading more than just epub and mobi before, there were also some lit and lrf books in the group that I'd randomly grabbed for testing. Will initializing the different input plugins and metadata readers for each format use up some additional memory?
Calibre started up using 209 megs of memory, and after adding a number of books (12 different titles, various formats) it rose up to 247-249 megs of memory (depending on which test run). It seemed like the memory usage stabilized somewhat at that point, but then I was adding and deleting the same group of books.
Different formats seem to use varying amounts of memory, I can do some more testing around that.
Note deleting all the books which caused the increase in memory didn't seem to free up any of that memory. Probably not a big deal, as that's not a wide use case.
I'll also let it run overnight again - before I was seeing the slowness after letting it sit open for several hours.
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