website-optimization-free-by-google

Page Speed Service is an online service that automatically speeds up
loading of your web pages. To use the service, you need to sign up and
point your site's DNS entry to Google. Page Speed Service fetches
content from your servers, rewrites your pages by applying web
performance best practices, and serves them to end users via Google's
servers across the globe. Your users will continue to access your site
just as they did before, only with faster load times. Now you don't
have to worry about concatenating CSS, compressing images, caching,
gzipping resources or other web performance best practices.
http://www.ghacks.net/2011/07/28/google-page-speed-service-website-optimization-service/

http://googlewebmastercentral.blogspot.in/2011/07/page-speed-service-web-performance.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+blogspot/amDG+(Official+Google+Webmaster+Central+Blog)