VS2010 WPF debugging: TextBox typing is very slow, just me?

I am creating a new application in .NET 4 and the TextBoxes are way too slow, I haven't applied any Styles, Bindings etc. just plain TextBox.

I tried to create a new project with a TextBox in Visual Studio 2008 and the TextBox works good.

Note: The problem only occurs in debug, when I run without debugging (^F5) it works good in VS2010 as well.

See the Microsoft Connect B开发者_JS百科ug Report I submitted.

It was because of the Intellitrace.
Once I disabled it everything works just fine.

Credit to Kris for his comment.