Every YouTube-user knows the “spinner” (a GIF animation). That’s the rotating icon indicating the buffering of a video that we still have to wait for. In this 9 minutes interview you can hear from YouTube’s employees how the response speed of film data is optimized. By means of smart strategies films are available for smart-phones, tablets and desktops, all in different formats and qualities. There are a lot of data centres in the world in order to speed up the response to the growing audience.