I second ShellShock's suggestion. If a tiny particle got wedged next to the frame, it could cause the problems you're having. Use canned air or a soft-bristled brush and clean around the frame.
Or it's possible it's a poorly formatted book as well. Try it with other books and see if the sluggishness is on all books or just that one.
I'd try both of those before resorting to a reset.
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