Thanks for the excellent explanations @Davidfor and @Sherman..
so would a quick fix be to have an option to not receive the thumbnails separately from calibre in addition to the kepubs/epubs themselves?
Then just let the kobo device regenerate the thumbnail on its own time. This could be marked as a "enabling this will increase your memory usage. not recommended if you have a lot of books" option.
The other option would be to just receive them 1 by 1 and save them to disk immediately after processing. slow and steady..
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