Those of you who have been having the problem with frame rate in nUI... can you please save the two files that are attached to this message to your [ Interface > AddOns > nUI > Bars ] directory and then reload WoW (a '/nui rl' should be sufficient) and let me know your results.
Are you seeing any taint messages? How's your frame rate?
(note: if you are using Swatter, the command '/swatter warn' will turn on warning messages if you are getting taint)
With this fix, my lowbi lock in Eversong Forest saw his frame rate jump from 12-20fps in windowed mode to 77fps -- I'm not sure if it's the code change or just coincidence, so, let's see what happens with folks who had the bug.
(attachments removed -- no longer applicable)