Laggy game?

Does anyone else lag on this game? I don't know why but this is the first FPS i've played where I've lagged...I don't understand because the graphics aren't really anything special...I have the game on my firewalls exception list...The only thing I can think of is an internet connection problem but even then I don't lag on any other games..

What can i say, some people get lags, others no... Maybe it's because still in Open Beta, they will probally fix that.