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I averaged 48 FPS with ultra settings on my 09 core 2 duo 4670. In dungeons it would hover around 80 FPS. When I switched up to the 5670 I am averaging around 55-60 FPS and 90-115 FPS in dungeons. All on ultra. You may have an issue somewhere if your running that low. The only time i dip into the low 30's is when I'm in Dalaran while it is very populated. like outside the Bank.

I am using Titan Panel for my FPS numbers and averages.

Forgive my ignorance, but is that under the mac osx or are you playing it in bootcamp?
 
Forgive my ignorance, but is that under the mac osx or are you playing it in bootcamp?

I am running it on OSX. it really all depends on where your at and how populated the area is. I am on illidan server in stormwind and I am sitting at 76 fps.
 
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