So, I have an Apple TV3 at the moment, and I genuinely get super annoyed when using it with my rMBP as extended desktop. It works FINE with my gf's Macbook Air! I've searched far and wide for a solution, my bluetooth is off, I have a Time Capsule, the ATV is wired to the Time Capsule and still it persists- glitching, stuttering... There is a line of code I've been using in Terminal which helps but it's still not perfect. My question is- has anybody had this problem with the ATV3 and upgraded to ATV4 to find the problem has gone?? The main thing I use the ATV for is for extended desktop so everything comes through my home cinema amp and TV. Any insights before I go out and buy one would be greatly appreciated!