I was playing around tonight with some polypainting on just a sphere tool at 1million polys. I created a new lightcap for it and immediately noticed ALL aspects of the lightcap menu, creating it, adjusting it, etc are extremely laggy. Is this a known issue?
are you running AMD/ATI?
Yes sir. From your reply I assume thats not a good thing 
AMD processors have issues with lightcap materials for some reason.
My home machine is an AMD and it is slow and unresponsive with them, my work machine is Intel and it has no issues. I’ve spoken with support about it and they are aware of the issue. So yeah…
Does support being aware of the issue mean they are trying to correct it for future versions?
IDK, I would assume so as AMD has a rather large install base.
Ok, thanks Beta.