If I suspend resharper the problem is no longer existent. I tried to disable as many html options as possible with no luck. I can scroll around an html file fine and can even delete characters with no speed degredation. VS doesn't start to slow down until I actually start typing in the file whether it's a div or a class name.
Here are the settings I have disabled:
Environment > IntelliSense > Completing Characters = HTML: Complete on Space : Off
Code Inspection > Settings > File masks: Added *.cshtml
I'm not sure what else to try. I love resharper but if I can't edit cshtml files then I can't even use most of the features.