MacBook retina 2016

[Malek Yamout]

Can the new MacBook play 4K video on YouTube without stuttering?

 

[pkcable]

There are more factors than the processing power of the computer. In fact perhaps more important is the speed of your wifi or cellular connection (your internet speed)

 

[Rob Phillips]

Barring outside factors, like the ones that @pkcable mentioned, the new MacBook should have zero issues playing 4K video.