FPS drop on OS X?

[ianwrecked]

Hey guys. I've noticed that I'm experiencing a huge FPS drop within the last update (today). It's been steadily going down for a while with every passing update. I don't know if this is conflicts with the engine or just not being optimized for OS X the way it is for a PC? I was normally experiencing around 50-60FPS but it drops like a rock to about 10-20 recently.

My specs are as follows:

Yosemite

3.1ghz i7

16g RAM

NVIDIA GE Force GT650m

I feel as though I ought to be able to play on max settings with no issue and it still spikes even on LOW settings. Any help would be appreciated. Would just like to play the new area without plodding through terrible performance.