Quote:
Originally Posted by Edward M. Grant
Ah, I didn't realise that epub was much more complex than mobi. From what I'd seen, the formats all seemed pretty similar.
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They are both HTML but, because ePub supports CSS (and Mobi doesn't), the ePub reader has to maintain state information, and to do that it has to construct a parse tree from the CSS. That can be quite a computationally intensive task.