If I remember correctly from previous conversations on this, there has never been confirmation that the speed of the centrifuge has been slowed since opening. Some people have reported that it felt "toned down" many months after M:S opened, but it's hard to know for a certainity, unless someone knows for a
fact that the speed has been adjusted. Unless I've missed something in previous posts, no reliable insider has confirmed any changes.
But, I've slept since then, and could be totally mistaken.
*EDIT* And, while I was typing, Corrus confirmed no changes. Corrus is a Cool Mean Guy!
Some people seem to get concerned about the g-force, but that is not the real issue. The issue is how well you deal with sensory conflict, which is your mind receiving conflicting sensory input about the movement of your body in relation to other objects. That's why it's repeated several times before "pre-launch" to keep your head still, and focus on the screen in front of you. What happens on the screen corresponds with the motion your body feels, and lowers the sensory conflict. If you look to the side or look at the controls too long, everthing is stationary - but your senses are telling your brain, except your vision, that you're moving. And that's where the nausea or disorientation can occur.
Okay, scientific talk over. G-forces rule!