I've had this problem with some ePubs as well; some ebooks crash on load. Most of them work okay on a second attempt; a few don't. (I believe ePubs that have images encoded as weblinks instead of included in the file are prone to crashing, but haven't done extensive testing.)
I've also had problems with ePubs where page turns take 3-5 seconds each; this is fixed by closing out of that ebook, opening a different ebook (which always takes a long time), and then re-opening the problem book. I suspect it's caused by HTML files that are split at near the maximum 300kb instead of being split by chapters; I've found it in a few Smashwords books.
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