I came across a great post today that talks about ASP.NET caching (applies to SharePoint) and what to look for.  Thanks to Gunnar Peipman for the great insight.

http://weblogs.asp.net/gunnarpeipman/archive/2010/04/02/measuring-asp-net-and-sharepoint-output-cache.aspx

Basically you need to setup the following performance counters in windows:

  • Total number of objects added
  • Total object discards
  • Cache hit count
  • Cache hit ratio

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