macOS Sierra performance
I have been running macOS Sierra on my Mac Mini 2014 and am happy to report that I have not encountered any problems compared to El Capitan. I have it hooked up to my NAD T775HD receiver through HDMI and from there to an Epson 1080UB projector. I use the Mac Mini for audio only as well as movie/TV shows. I use eyeTV, Plex, Audirvana, iTunes, etc. They all seem to work fine. I wish Apple would let us bitstream advanced codecs, but not sign of support for that!