Well i built my own compilation and set it up to *look* like nUI. i hover around the 50+FPS mark no matter where i am (haven't tried it in a raid yet, but i expect it will drop a little).
With nUI i can only hit that on an alt in STV or other lowbie unpopulated areas. As soon as my main comes out to play, my FPS drops
(yes i did test this with NO other mods installed on a clean WTF).
I still support nUI fiercely and will continue to support it. Hopefully the taint/FPS issues will jump out at you Scott so you can work on a fix.
Great work mate. Thanks