RC1 destroyed my frame rates. With b7 and even in beta 10 i was getting 26fps with cumulus overcast, visibility mvfr and cloud sliders to 40%. Now with the same settings I am getting 21 fps. I am dead sure this has something to do with opaqueness of the clouds. In beta 7 I figured out that if I push my opaqueness cloud slider to 100%, I was getting an fps boost ranging from 4 to 5 in overcast clouds. Maybe the clouds in RC1 aren't that opaque anymore and we can't set the opaqueness because that option is gone.