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ASP.NET provides two types of caching that you can use to create high-performance Web applications. The first is called output caching, which allows you to store dynamic page and user control responses on any HTTP 1.1 cache-capable device in the output stream, from the originating server to the requesting browser. On subsequent requests, the page or user control code is not executed; the cached output is used to satisfy the request. The second type of caching is traditional application data caching, which you can use to programmatically store arbitrary objects, such as data sets, to server memory so that your application can save the time and resources it takes to recreate them.

The AspNetAppCacheTest monitors the performance of the ASP.NET Application (or Application Domain) Cache.

Measurement	Description	Measurement Unit	Interpretation
Cache_total_entries	The current number of entries in the cache (both User and Internal)	Number
Cache_hit_ratio	The current hit-to-miss ratio of all cache requests (both user and internal)	Percent	Physical I/O takes a significant amount of time, and also increases the CPU resources required. The server configuration should therefore ensure that the required information is available on the memory. A low value of this measure indicates that physical I/O is greater.
Cache_turnover_rate	The number of additions and removals to the cache per second (both user and internal)	Cached/Sec	A high turnover rate indicates that items are being quickly added and removed, which can be expensive.
Cache_api_entries	The number of entries currently in the user cache	Number
Cache_user_hit_ratio	Total hit-to-miss ratio of user cache requests	Percent	A high value of this measure is indicative of the good health of the server.
Cache_user_turnover_rate	The number of additions and removals to the user cache per second	Cached/Sec	A high turnover rate indicates that items are being quickly added and removed, which can be expensive.
Output_cache_entries	The number of entries currently in the Output Cache	Number
Output_cache_hit_ratio	The total hit-to-miss ratio of Output Cache requests	Percent	A high value of this measure is a sign of good health.
Output_cache_trnover_rate	The number of additions and removals to the output cache per second	Cached/Sec	If the turnover is high, the cache is not being used effectively.