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Diagnosing High CPU in an ASP.NET App with PerfView

Josh Darnell goes hunting for the problem:

A colleague reached out to me while they were doing some routine maintenance on a web server. One of our app pools was sitting at around 25-35% CPU usage, despite the fact that no one was using this particular application. They intended to restart the app pool, but asked if I wanted to check anything first.

Read on to see what Josh did to troubleshoot and then correct the issue.