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			"Frecency" is a concept that combines of frequency and recency.

	The overhead of calculating frecency for each request is simply too high, as is the overhead of continuous recalculating frecency. So I would propose that we calculate a frecency rating via one of the methods below, and at sort time apply the weighting based on the lastVisited date. Done right, this should just be integer math, and quite fast.		The overhead of calculating frecency for each request is simply too high, as is the overhead of continuous recalculating frecency. So I would propose that we calculate a frecency rating via one of the methods below, and at sort time apply the weighting based on the lastVisited date. Done right, this should just be integer math, and quite fast.