Tunnels and Video cards ??????????

[COOLS]

Have a video problem , well question. While playing BHD online, tunnels are almost impossible. When in tunnels the game play gets very rough and sort of sticky...not framing but just not smooth at all. I did a test and downlaoded a tunnels map and served it up and played it myself and was fine. I was always under the impression that the server downloads all the terrain, map and game information before the game starts, so only changes that take place during the game (player possitions blown building and such ) is the only info that has to be sent and recieved. Also do some players recieve more bandwidth than others? (heard the expression bandwidth hogs) my machine spec's 2100 xp, 512 ddr 3200 corsair ram, Gigabyte GA-7VAXp moboard, 64 meg 4200 pny video card, cable connection . download speed around 950, and up a pitiful 80 or so ...

All and any info appreciated

THANKS Perplexed ........> COOLS