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Haven't done any heavy lifting with it yet, or loaded it down with my normal spectrum of software, but it definitely feels responsive in this VM. Boot and shutdown times are impressive, animation is fluid and apps pop up impressively fast. Can't say that it'll be an upgrade from a nearly ten year old OS in terms of performance, but it's absolutely more spry than Vista and 7 in it's current form.
I'd also like to congratulate MS on one of the things they did absolutely right. The integrated search is one of the best I've ever seen, and more than anything else in the preview it comes close to being a legitimate reason for the Metro malarky being included on desktops.