I have a Vizio Co-Star GTV box and the Chromecast dongle. When watching ESPN3 I can get much better resolution on the GTV box than I can get by means of the laptop running to the Chromecast. To be able to effectively watch the same event, I have to set the Chromecast connection to Standard (480p). Either of the 2 resolutions above that cause the video to slow right down. I have tested this using both devices on ethernet and of course the same network is being used. I am sure that if ESPN offered an Apple Chromecast configuration for ESPN3 that this would not be a problem as all the other iPad apps designed for Chromecast perform well.