From Brad Christiansen, "The attached files add the ability to control when a paged child becomes eligible for expiry based on time and/or elapsed frames.
I found that some of the items that had been paged in were being expired on the first frame that they were not visible (as the cache was full). This resulted in excessive paging every time the view was moved. With the following changes I could only allow children to be expired if they had not been used for e.g. 30 seconds or 60 frames."
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