switching between desktops is slower. It eases as a much slower rate at beginning and end. I've also noticed that you cannot cancel a desktop switch until the previous is complete, and thus cannot cancel a desktop move.

Wow... I haven't tried Mountain Lion yet, maybe I should before the retail release.

Are the desktop transitions really so slow that you would want to "cancel" one before it finished?

Wait. Slower than Lion? Lion is already considerably slower than Snow Leopard. It can't possibly be any slower. I really, really hope you're confused. I'm already using some sub-par-experience tool to override Spaces/MissionControl to speed up the four finger swipes.

Really ? I haven't noticed any difference switching desktops.