This was probably discussed before but have you noticed some stuttering on video playback (on iTunes, VLC, Quicktime, etc.) when your rMBP is connected to a TV via HDMI? I'm on Yosemite which I was hoping would resolve the problem, but it still there unfortunately. Weird that it doesn't stutter on Airplay to the AppleTV. Does this have anything to do with not having a dedicated GPU? Thanks in advance for the replies. UPDATE: I was playing around with resolution and outputting video to 1080i instead of 1080p seemed to have done the trick. There is no stuttering and no visible downgrade in resolution on a 50" screen as far as I can see.