Nothing at all like that, and I sideload a lot of books via Calibre.
First question: are you sideloading into main memory, or onto a Micro SD card.
If the latter, is the Micro SD card a brand name -- preferably SanDisk (people here have reported the fewest problems with them in Kobo devices).
Second question: how many sideloaded books do you have on the device? If it's thousands, performance might be impacted (although it shouldn't be slowed up that much).
Third question: what kind of sideloaded books? Plain mostly-text novels/nonfiction? Or heavily illustrated books?
Fourth question: do your sideloaded books have chapters and a working table of contents? Normally, the Kobo Glo loads a chapter at a time from the ePub file (which is really an archive of multiple files, one for each chapter).
A book should open in seconds; not minutes.
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