It is ridiculous.

I can run 2560 x 1440 smooth as silk around 35fps in Bootcamp.
In OS X running 1920 x 1080 with everything turned off and can barely get a jerky 24fps. This in open terrain. Frightened to see what happens in a dungeon!

I knew not running DX11 would be a penalty, but this is crazy. Didn't anyone test this stuff?????