Of course, if you need a graphic "Book Management" interface you are probably going to have to put up with that database processing (and possibly occasional "database corruption" errors/crashes). I have 7000+ ebook/document files in 50+ category folders, hidden from Kobo's processing. I read them using KOReader and find what I want to read, by browsing through the files, just like I do on my PC. My book files are on my external uSD card, but would work at least as well on a larger internal uSD card.
Luck;
Ken
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