OK I got an LG TV which runs at 3840 x 2160 @ 30 Hz. Testing with a mid-2014 RMBP via HDMI.
The motion seems smooth when running fullscreen on it, but I did notice that on the release versions there is considerable shearing, vs on a local build (which may come down to compiling with the macos 10.6 SDK vs the 10.13 SDK). Doing more research and experimentation...
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