OK, cool.

Chugs are usually texture loads. Most of the time when I see that stuff happening, it's because the computer or the video card doesn't have enough free RAM to do the job smoothly. Also, it could be caused by an AGP bus that's not running at its full speed, and it's taking longer than expected to squirt the textures to the card.

Of course, I've also seen games where the chunk happens simply because the game code doesn't manage the texture loads efficiently enough. Hope that's not what's happening here, or there are going to be a lot of disappointed people tonight.