I just noticed something unexpected. The worst of the sluggishness was using menus within the book, changing font size primarily, which I do often. The lag was nuts. I changed the font from Charis 7 semi-bold to Charink6 and the response time was, if not snappy, less painful.
(Semi-bold was my default because my vision is lousy. With Charink6 I have to use the heaviest weight on Kobo's slider - no wiggle room. I tried Charink extra weight, but that was too much).
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