I\'m working on a ColdFusion project for a while now, and Visual Studio started to behave strange for me at least.
I observed that when I started debugging, it built
Debug -> Delete All Breakpoints ( http://darrinbishop.com/blog/2010/06/sharepoint-2010-hangs-after-visual-studio-2010-f5-debugging ) After that you can use them again, but do it once. It will remove some kind of "invalid" breakpoints too and then loading symbols will be fast again. I was chasing this issue for days :(.