"Today’s Beta release improves on two of Chrome’s core principles: speed and security.
One of the things people like best about Chrome is that it loads web pages quickly. To get you where you want to go even faster, Chrome will now start loading some web pages in the background, even before you’ve finished typing the URL in the omnibox. If the URL auto-completes to a site you’re very likely to visit, Chrome will begin to prerender the page. Prerendering reduces the time between when you hit Enter and when you see your fully-loaded web page--in some cases, the web page appears instantly."