I'm using UCCNC and Proma 150 THC on my plasma table. I see non of the issues you described. I see no noticable delays.
Here are 2 videos where they use UCCNC and NeuronTHC and you can see no delays on this video either:
https://www.youtube.com/watch?v=b-BMwzNSrr0
https://www.youtube.com/watch?v=uqtQoqiSS4A