Sideloading just means loading your books on using a USB cable (rather than by Wifi, etc.)
I just went to test sync timing with a new book added, and realised that with the recent system update my iPad books are in iBooks now. Which system & version of iTunes are you using?
I added a 388 KB by putting the epub into iBooks, ticking the box to sync it in the iPad's iTunes preferences, and clicking Apply. The new sync to the iPad then took eight seconds. If it's taking five minutes for you via a cable, there's something very different between your system/setup/etc and mine. If I'm doing a full back also during that sync, and I haven't done one for ages, sure that takes time - but that's not "taking forever to sideload a book", it's taking a reasonable time for a full backup. You can just unclick the full-backup option before you sync, if you're in a hurry.
Last edited by meeera; 01-19-2014 at 09:40 AM.
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