Here is a detailed review by Geeks are Sexy and a verdict:
"What Chrome provides is more of the same paradigm, but more efficient and arguably more user-friendly."
(Image credit Geeks Are Sexy: Chrome could be roughly 2 to 20 times faster than Firefox or Safari)
The Yahoo review sums up the performances:
While Chrome's performance is a little better than that of Firefox, in practical terms, it is far less useful, because it lacks the broad array of third-party add-ons programs like Flashblock that make Firefox so customizable. With time, it might catch up.