Aliblista(UK)i get these problems sometimes, usually wen i first join a game/load a level ireckon its bascilly just the vid card loding all the textures or sumfing.
If you join an online game, and it lags at the beginning, it might be Punkbuster doing it shizzle and stuff. Usually, the only lag I get is PC lag, even though my ping averages in the 40's... :uhm: Just lucky, I guess. PC lag is when you start moving every second or so, and internet lag is when you have high ping and when you move, you sometimes go back to your original position. Very annoying.