I'm certain nUI updates the frame rate indicator more frequently than the Bliz one does. I have no idea what frequency PerformanceFu uses though.
A 10% drop in performance using nUI is probably not out of the realm of possibilities given how much work nUI has to do... it sounds a little high to me, but I wouldn't be freaked out about it (though I would sure be looking to improve it -- and always am)
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