Back in Phase II There was 5 settings on Density settings, on the higher settings, the trees looked better, fuel leaks could actually be seen, but you get nothing for nothing. Your FPS went down.
By the same token, on the Lower settings everything looked bland, but your FPS went up. A man's gotta do, what a man's gotta do
One of our members was talking 75 FPS, he's a candidate to UP the Density. While the guy running AGP can benifit from the Low setting
Not being a Developer, I can't swear, but 2 + 2 = 4