Random lags

For some reason when i am on this dark rp server i get random lags, i am not sure why but i dont think it happens on other servers. But maybe i was thinking its my graphics card? Idk never happens on other games. I have a AMD radeon 6450 HD.

Did you try downloading more ram?

I have lots

[editline]26th October 2011[/editline]

Wait downloading ram? lol