· UriScavengerPeriod. Default value: 120 seconds.
Important Registry Setting for production IIS web server environment.
Below description do not belong to me..
I referred below blog :
The http.sys cache is periodically scanned by a scavenger, and entries that are not accessed between scavenger scans are removed. Setting the scavenger period to a high value reduces the number of scavenger scans. However, the cache memory usage might increase because older, less frequently accessed entries can remain in the cache. Setting the period too low causes more frequent scavenger scans, and it can result in too many flushes and cache churn