Is there a different RestartGX() function?
 

I'm trying to make an addon to set the evironment distance based on zone. The one in game does it without freezing up the game. So it can't be RestartGX() function. Must be a different way or restarting the graphics without causing a few seconds of freezing?

It looks like Blizzard is just calling SetCVar. You just need to call (1 <= value <= 10):

Yeah that did it, thanks