Well, I've been running the Consumer Preview since its release, and I have to give a shout out to it, it's impressive performance wise! Not only is the CP impressive, the Developer Preview had some solid performance with it as well. And when I speak of performance, I speak of cold boot and restart times. Shutdown and startup on hybrid boot is fast and all, but what I find impressive is how the cold boot times have stayed strong. It hasn't been taking longer to restart or cold boot. I also have seen this on the Developer Preview as well, and I ran that for a good SIX months. Normally, in Windows 7, I had to do some advance witchcraft of my own to keep it running in top notch usually every once a month. In the DP, I never had to do anything other than do some defragging and letting Automatic Maintenance do its thing. In the CP, it's the same story.
If things continue this way, maybe cold boot and restart in the Release Candidate is even more solid and overall, everything is more solid!