edbro - it takes very little time to index the books, but the thumbnail generation of the book covers is done in the background only when the device has to show the cover the first time. When you are going to the home screen, the device is likely trying to make covers for you to show you the books. When I measured the cover generation, it takes about 2 seconds for each cover. For 2700 covers that is not an insignificant chunk of slowdown.
I have about 1000 epubs on my device and once every book had a cover generated, the speed went back to being quite fast. To do this, I simply added all my books, chose to view the books by there cover, and then browsed through my books in that collection and forced the device to make covers for each book. Now when I add more books, the covers are quickly generated and there is not really a noticeable slowdown.
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