I put now about 1050 books in 6 identical folders - 175 book per folder, most lrf, some pdf - total about 700 MB - after deleting everything from before on the sd card.
It took 2 minutes 20 seconds this time, so a noticeable increase versus the 225 case, but much less than with the jpg's. On the second reinsert of the sd card, it took about 1 minute and 15 seconds, though this time the card had the Sony layout folder.
I flipped through the book list using touch to jump by initial of title/author, search by title/author, opened books, zoom, back menu, and all was almost as fast as on internal memory, except the first open/first zoom which took as before about 15s for a regular lrf, 22s for a huge one, with first zoom at about 25s, but next at same size (almost) instantaneous.
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