Lagging in Campaign nothing else??

[RazorHead1 10]

Howdy all...I was wondering if anyone else is having the same strange problem I am having. I get massive FPS drops in the main campaign but no where else. I have played all of the single missions and created huge missions in the editor, as well has have downloaded many off of other sites. Everything else plays extremely well...it's almost like I'm on a different machine when I play the campaign. Any ideas...???

[no use for a name 0]

what are your specs? the campaign has a lot more AI running around then in a single mission so it could be a CPU bottleneck