If you read the linked ChromeShell page, it says it goes from standby to the Chrome browser in 3 seconds. It actually takes 30 seconds to boot, which isn't much better than Windows. Actually, is that even better?
From the linked ChromeShell page: "ChromeShell is a non-google affiliated replacement shell for windows", ie. this _is_ windows, which would explain why it's not much better than windows. Any observed gain would be linked to the presumably lighter ui of this new shell. Since, this has nothing to do with google's chrome-os appart for the fact that it copies its interface, no performance implication should be derived from it.
Those who can, do; those who can't, write. Those who can't write work for the Bell Labs Record.