In the 2.0.5 patch notes, it mentions that you can set an option in your config.wtf file for a UI accelerator and it has a few switches like on, internal only, partial, and off.

I have heard that it corrupted people's installs, but this could be entirely hearsay.

Does anyone have any experience with it or know specifically what it does?

I checked the config.wtf file and its not in there. I was under the impression that this was something you had to manually add if you wanted to use it.

some people were having serious UI issues - graphical glitches, wrong icons (not just the usual ?s), etc.

I thought this was to fix those problems.

I've been having issues with my framerate dropping from around 40-60 fps out and around the world to down to <5 after several hours straight of playing. I am able to close out of WoW and restart to fix it, but then a few hours later it resurfaces. After about the third time of doing this, when I log back in, I'm missing large sections of the world, as in invisible polys. My framerate is stupidly low at this point, so I reboot my computer and it fixes itself. My latest attempt at fixing this involved disabling SCT on a hunch, and I haven't had it drop yet, but I also haven't played for 12 hours straight either since then.

Does this sound like the problems that players had with the UI Accelerator, or something different? My CPU, motherboard, and graphics processers were all running below 45 degrees Celsius as a reference point.

I've been getting the Wrong Icons bug, but it never happened before 2.0.0 (or was it 2.0.3?). Something had to have changed in the UI rendering code.

Twid, I had something similar happening to me (although far more frequently) I unchecked 'smooth mouse' which had significant effect on the slowdown, and downloaded some new drivers (I've got an ATI card, and they have new drivers that are about 2 weeks old) which fixed the graphics.

Ok, thanks for the tips. I'll see if I have smooth mouse enabled, and double check that my NVidia drivers are current. I didn't drop framerate last night and didn't have SCT on at all, so I'll reenable it and see if it returns.