The ghosting is specifically related to highlighting. When you highlight, you're drawing a giant black rectangle over the text you highlight, and when you turn the page, there will be ghosting from that rectangle. If you highlight a lot, you'll need to use a frequent page refresh setting, the way he does.
If you're just reading normally without highlighting anything, then there are no ghosting problems. The Carta 1200 screen has minimal ghosting for normal reading purposes.
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