From time and time again, humans have always preferred taking shortcuts, so Google has naturally assumed that we would want to, too. In result of that, Google has created a new browsing experience. It works by letting Google download a website’s webpages and then supplies it when somebody clicks on its search results. From now on, every site that signs up for PageSpeed Service will load on your screen about 2 seconds faster (statistically). This might not sound much but when you multiply that by a billion plus users, Google will probably be saving thousands of years of our time. Just remember that this is still in beta form but if you own your own website and DNS you can sign up here.
Source: Google Developers Blog