They cause my computer and others computers to lag. I think Hagar43 said they were dragging his fps down to 15-20 and the previous map he was at 80 fps. The last one I played I just left the playability is so poor it is not fun at all. I am sure that on my system that I am seeing similar results, but I don't display the fps. But, the result is that I have lead feet, and I can't hit a thing with my rifle. When my system is not lagging I can be a biatch with my rifle at times. About the only way I can get any kills on those maps is with a shotty at very close range. Which is tough when everyone is running around with rifles and sprayers. I won't dispute they are pretty, but I have heard more than one person complain about their system choking on them.