It's getting slightly OT here, but: Readium, last time I looked at it, was a bunch of Javascript that mangled EPUB(3) in order to provide it to a HTML renderer. So it would be Webkit (full Webkit, whatever that might be) plus a Javascript engine (probably, Webkit's basic engine would be enough). Translated to conditions where it ought to run, it is probably dead-slow. Though now that you mention that Kobos reader might use that, maybe I'll have a look. In a few months, when I have spare time, that is.
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