You're supposed to see faster response in the pose room. For some people it makes the difference between using full tracking and fast tracking. It seems to make the most difference for people with relatively low RAM - 512 Meg for example. I think I'm seeing slightly smoother posing on my 1 gig machine, but I'm not 100% sure. However, not going through that agonising wait when you accidently click the content room tab is a huge improvement. My P5 is on a machine that isn't connected to the internet and it gets upset every time I accidently click that thing.

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