With the mouse sensitivity I first tried all the way to the left and it made it move slower, so I now have it almost all the way to the right. It is very fast during the opening screen and on the 1914 Guns of August scenario, but is crawling in my GC. I also have the sliders on the in-game options all the way to the left.
Mcafee... and I can't seem to find a way to configure the anti-virus to exempt just any one program. The firewall I have set to Full Access however. Maybe I'm missing how to do it with the anti-virus... Mcafee used to be a lot easier to configure.
Edit: guess I could try and launch it with anti-virus disabled and see how it goes.
(Didn't make any difference with antivirus disabled, also noticed my fps was at 3.83)