Turning off the flag animation seemed to help me also. Anything that's animated would cause more CPU usage imo.
Also, I run my graphics quality in the game at medium, it helped ALLOT and I barely noticed a difference in the graphics.
I also am always sure to close the main WGT window when i start playing. It has flash animations on it too that slow you down.
One last thing....you may want to try gamebooster. Just search it on google and download it.
Hope that helps you :)