It seems that the FPS achieved in Joint Ops is very dependant on the server you're on. Try going into some of the training missions. You should have consistent FPS. I've been on some servers where the FPS was kickin' and the ping was in double digits. The number of players on the server was under around 100, maybe a little more. However, on other servers where the ping was the same but the number of players was getting close to the 150 limit, it seems to slow it down significantly no matter what res I set the display to. Just an idea, but it really does seem to be more of a server issue than a bandwidth or driver issue.