Google announced on 2nd Dec 2009 about the new feature recently included in Google Webmaster Tool. This tool help website owner to check the speed performance of their websites. This new feature will allow you to check the speed of your website and to know more about how to make your website load faster to improve user experience visit following page
These steps guide you to make your website load faster.
Visit Google webmaster tool www.google.com/webmasters/tools/ and verify the ownership of your website and then you will be able to check the performance of your website. Under Labs tab you will find a link with Name Site Performance and Google will show the chart that describe the how much time your website take while loading.