"Speeding up websites is important - not just to site owners, but to all Internet users. Faster sites create happy users and we've seen in our internal studies that when a site responds slowly, visitors spend less time there. But faster sites don't just improve user experience; recent data shows that improving site speed also reduces operating costs. Like us, our users place a lot of value in speed - that's why we've decided to take site speed into account in our search rankings. We use a variety of sources to determine the speed of a site relative to other sites." -Google April 9, 2010