I recently upgrading ASP.NET MVC 2 solution from Visual Studio 2008 to Visual Studio 2010 (Ultimate Edition). I found that debugging was very slow. Depending on project size, it took around 30 seconds to initialize and another 5 seconds on each page request in my experience.
I tried disabling IntelliTrace (what is IntelliTrace?)
and voila! it got its awesome performance back!
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