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Just to make sure we are seeing the same thing (not 3 seconds but ...),
I took the epub you sent and split it and then started hand editing the longest remaining file with the most images and fonts.
I clicked into the middle of that long file and starting adding and deleting text. And *after* my typing stopped (after a brief interval) Preview auto updated and I saw an annoying flash during reload but that was about it. I could keep editing and so on and other than the annoying flash, nothing else bad happened. I did not sit and watch Preview reload. I just kept adding and deleting text and never felt any slowdon when editing.
So if you are seeing something different, then please produce the garbled test case I asked about so we can see if other Window users are seeing what you are seeing instead of what I am seeing.
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