On April 9th, 2009, many people developed an interest in speeding up their websites, after reading a post on the Google Webmaster Central Blog – Using site speed in web search ranking.
On the same day, Google’s Matt Cutts published Google incorporating site speed in search rankings on his blog. These posts introduced site
speed as a ranking signal that Google would be using.
Matt Cutts told us that it wouldn’t be an earth shattering signal. And that it might not have an impact within a large set of rankings. But he did stress that speed has benefits other than just ranking, including improved user experience.