That's one of the main problems with DMX over Ethernet systems such as Artnet. It's UDP, so packets can get lost and if they do it can have devastating visual effects as we all know. Murphy's law does say it will lose the off packet patched right in the middle of your screen

I think that continuous unicast would be the best solution, I can tell you that the datagate can definitely handle 25fps unicast for all 8 ports.

Thanks

Nicolas
www.enttec.com