VS2010 Ultimate included IntelliTrace functionality by default.  IntelliTrace captures events (e.g. exceptions), and can affect performance of debugging. The typical performance hit is about 5% in the default mode (collection can be increased to collect method calls and parameters which can have up to a 15x hit). However this is completely dependent on what events and how many are occurring. For example, the MVC2 framework uses exceptions for control flow (hundreds can occur when loading a web page), and so launching an MVC app with IntelliTrace enabled runs significantly slower because a call stack is captured for every exception. 

IntellliTrace is however not the debugger, and can be turned off (Tools -> Options -> Intellitrace) if this is causing too much of a problem.

From my own machine, I downloaded MVC 2 application Orchard source 0.5.144.zip from http://orchard.codeplex.com/, and setup it using the compact database after running it.  When I do F5 with IntelliTrace on by default, the start up process took about 14 seconds.  When I do F5 with IntelliTrace disabled, the start up process took about 9 to 10 seconds.

Hope this helps you to debug faster if you don’t need IntelliTrace when debugging your MVC2 application.

- Xinyang Qiu | Web Platform and Tools Team

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