Tried a vmix call test with 4 callers the other day. Ran into a real struggle to deliver a quality return video and audio feed back to the remote callers. I did run into a CPU overload warning and found that increasing the return video resolution quality made my whole system unstable.

Am on a rental laptop that I'm using as a Vmix test device - 2.9GHZ i7, GTX 1080 GPU, 32GB Ram, is this solely a hardware limitation? My next step is testing with a lower program canvas resolution (720p vs 1080p). Can other users consistently return a 720p feed to all 4 of their vmix remotes with more capable hardware?