Wondering how the current i5 or i7 iMacs perform with 4K or even full screening 1080/60 content - any issues with YouTube? Netflix support? Other high def rental services? One of the benefits I see with the new kaby lake CPU (to be used in next-gen iMacs) is the native encoding/decoding of more common 4K video codecs. So without taxing the CPU, it should become much easier for computers to display high def content, less buffering, framerate stuttering, fans blowing, etc. (If that is a factor at all.) What's been your experience? Works well or is this a feature worth holding out for?