49016e78_rver_Features___Hack_Mine_Wiki__Description
[Property] avgPctUsagePastWeight [Default Value] 0.999 [Description] 
The weight to give to the past "avgPctUsage" when calculating the exponential average. Should be between .85 and 1.0. Basically, it determines the "quality" of avgPctUsage, smoothing it out with prior miss ratios. Too low and your cache will be too sensitive to fluctuations, causing excessive resizing and potentially crashing your server if bad enough-- too high and your cache is too resilient to immediate usage needs, growing only when it's too late and thus causing lag of Biblical proportions, also potentially crashing your server.
Server Features - Hack/Mine Wiki
Description