Haven't epubs always been slower to refresh that pdfs? I'm still running 1.7 firmware because I don't need the advanced features of RC 3 at the moment and RC 2 seemed like a dog from reports on here. From that perspective there seem to be no problems with page turn speed, regardless as whether the file is viewed at original size or reflowed. I do tend to reboot from time to time and have noticed that this seems to cure any apparent sluggishness - I say apparent because I have never timed page turns but if they seem to me to be slowing up a bit - if I have opened a lot of files in a short space of time is one example where this seems to happen.
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