What are the basic performance counters that I should care about to measure the performance of my ASP.NET web site?
Review the ASP.NET Applications\Requests/Sec counter to determine how fast you are able to process work per second. Higher is better.
Revew the ASP.NET Applications\Request Execution Time counter to determine how fast a page takes to execute. Lower is better.
Review the ASP.NET Applications\Requests In Application Queue counter to determine if any requests are waiting at the application level. Lower is better.
Review the ASP.NET Applications\Errors Total/Sec counter to determine if you have a high rate off errors. If so, fix the errors and check this counter again. Lower is better.