When I first got my Kobo I had similar problems with some free public domain books. Being conversant with computers I did some research and found Calibre and various other tools. I discovered the best fix for wayward epubs is to delete the css file and convert epub to epub in Calibre with settings you nominate. It took awhile to get my settings how I like them.. (blank line between paras, .5 em indent, remove first image, nominate separate cover and Meta Info, etc.
Once thats done I NEVER use the "Send to device" function in Calibre rather the "Save to disk" function using the Kobo as the disk. Never have a problem anymore with slow response.... one other thing I always do is make sure it splits on page breaks.... untick "Do not split on page breaks" as that allows faster parsing of chapters in the Kobo.
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