OK, so the issue is NOT the power line ethernet adapters. I have the ED plugged directly into my network (cable out the window.) When I play a sequence using Vixen all the RGB channels are smooth and do what they're supposed to. When I play the same sequence converted to the xLights format, it's laging or "jerky". It looks like what I would expect if I converted from 50ms to 100ms timing - I'm not saying that is what's happening, just what it looks like.
More info:
Vixen sequences were made using 50ms timing, 4096 channels, DMX channels all in the first universe.
Thoughts?