Apple TV 4 w/Dec 23 build unusable for 1080p

720p DVD’s are ok but using BluRay disk images is unusable. Tried wired 100Mbps, WIFI 1300Mbps 801ac, but the same: extreme jitter, audio drops off, not matter what audio options I try, and the source computer only shows ~1-3MB/s on source disk array, which is 1300MB/s capable. Using NFS.

After days of experimentation with various network and audio options, I’m out of ideas.

Blue-Ray 1080p just won’t play.