Each little "ball" is a request to the server On the left: the IP numbers from the users connecting around the world To the right: The url's being served up In the center: The "static calls being serviced by our front end
The brightness represents the speed with which the code written by our awesome developers delivers data (aided of course the great hardware)
Had any of the balls gone past to the right, that would have been a serve we couldn't return. Try that, Federer!