You can "clear" the ghosting, as you are reading, by going back a page, and then forward again. When you do that, if you pay attention, you'll notice that the first 3 pages are fine, then you will start to see the ghosting. It clears out when a full refresh happens after six pages.
I'm guessing that the Kobo (and Nook) developers had to choose between ghosting/partial refreshes/speed and no ghosting/full page refreshes/slower speed. The decision to go for speed was made. I hate the ghosting, and would have made a different choice, but had Kobo done that, we would have complaints about the speed here in place of the complaints about the ghosting.
I wonder if it could be made into user's choice, as well. Or, since the fist three pages seem fine, if a compromise might be to do the full refresh after three, rather than after six.
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