Not "will" cause more lag. It DOES cause more lag. When your UI is running 250 different scripts (above your basic display) to locate and show information from the server side to the client side, it DOES slow you down. Usually you get memory bleeds also.
If/When I get time, I'd love dig into PINCO's brilliance (and it really is brilliant what hes done) and streamline it. I'm more concerned with client speed then seeing second by second detail on every little flash of light on our screens. It would be incredible if a streamline version was available but I'd never expect it to happen because it pretty much goes against the very reason of the EC's existence, which is a shame.
I'll be playing the CC as well.
EDIT: I'm glad he was finally paid for his years of hard work that literally kept players from quitting and brought in new players. His work is responsible for more of our player base then any ad campaign UO has run in 17yrs.