We are using NewRelic to provide server-side application traces.

We have noticed that some of our applications consistently spend about 100ms in the method System.Web.Mvc.MvcHandler.BeginProcessRequest().

This happens before any custom controller code is called (which is logged separately, and not cumulatively) - it's not obvious why it would be spending so much time in this method.

What kinds of things will MVC do in this method? Could this simply be request queuing?

[EDIT:] As suspected - Scalayer's answer below was spot-on. We removed & optimized away all our session dependencies, and saw a massive increase in application scalability & stability

c# asp.net asp.net-mvc-3 newrelic
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