I was playing around on the SCUBA mission in singlplayer, and noticed that when looking in areas not consisting of many objects or AI, the GPU is around 80-90% usage. Now that I have been moving across the map towards the enemy base, I noticed that the GPU usage went to down to about 40-50% usage, leaving me with 20fps instead of the 40-60fps that I was getting beforehand. I would think that if entering an area with immense amounts of objects, AI, and other things, that it would require more GPU usage, not less.