On some searches, Google automatically instructs your browser to start downloading the top search result before you click on it. If you click on top result, the destination page will load faster than before.More info at Google's FAQ
Google uses a special prefetching feature in Firefox and Mozilla web browsers to provide this functionality, so results prefetching is not available in Internet Explorer or other web browsers.
Google now prefetching with Firefox
Posted on Thursday, Mar 31 2005 @ 17:09 CEST by Thomas De Maesschalck
Google released a new feature for Mozilla and Firefox browsers to prefetch search results to load pages faster.