If you have an ASP.NET application running on IIS 7 or IIS 7.5 that is experiencing intermittent delays, you have three powerful troubleshooting tools at your disposal that you might not have known about: FREB , Perfecto , and PerfView . 1) IIS Failed
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Read the complete post at http://blogs.iis.net/timamm/archive/2012/02/11/asp-net-and-iis-performance-troubleshooting-tools-3-key-resources.aspx