It extracts all books. That alone takes considerable amount of time.
And then for each book it creates a TON of database entries (about ~100 entries for each book, like an entry for each entry of the books table of contents). And while sqlite is a nice database solution for embedded devices, it's also slow as pots on the Kobo.
The process is anything but efficient - and entirely superfluous if there was an option to use folder navigation instead. Unfortunately that's only possible with alternative software such as KoReader.
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