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It is the full refresh of the page. Usually, when you turn the page, it's partial refresh, which is faster, but in the long run will decrease contrast. The full refresh restores that lost contrast, but is slower.
So it depends on your preferences - if the speed of page-turns is more important to you, set the full refresh less often; if the best possible contrast and sharpness is more important, set it more often. Personally, I've set it to every page, but I'm an exception - most people value speed over contrast.
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