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On = do full page refresh for every page turn = sharper text, less ghosting
Off = do partial page refresh for X pages (X used to be 6 pages, I think?) then do 1 full page refresh.
With setting set to off it also does full page refresh on beginning of every chapter, after a page that had some images/pictures on it, or after hidding any popup window (dictionary, Wikipedia, Go To, Main Menu etc).
You don't have any finegrained control over it (like setting number of pages on Kobo) except "full refresh all the time" OR "full refresh sometime/ when necessary".
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