Hi, I have just bought a 2016 MacBook Pro with touch bar. I have a dell 3216q monitor and I want to out videos at 4k but I am having performance issues. Can it be codec problems? Im hoping spending close to 2k on a MacBook it can handle 4k video playback. Connection is at 4k 60htz Any advice would be great. I am using vlc and the video type is mkv.