Framerate drops slowly from 60 to sub 5 after an hour of play.

[Train88]

For something that severe, i would look at background applications. When your framerate starts dropping, hit windows button, write: "resmon" (for ressource monitor). Select processor tab and sort it by cpu use. See what's eating those framerates...

[Koos]

I have been monitoring my other processes while playing the game and there was nothing eating up any sort of resources. I'm not trying to say my system is infallible, but I have OVERKILL for this game. Even when in highly populated areas, my graphics cards are only sitting at around 50-60% usage and my CPU only has around a 20-30% load. And like I said above, the highest my memory usage ever gets for the application is around 680ish MB.

But again, I'll double check it tonight when I play more and such!