Since the updat on December 4th I have stuttering and low fps during firesupports and everything that has to do with explosions.
The game ran pretty nice a few days ago. Only occasionally a slide fps drop from 70-60 to 30-40.
If you have an nvidia gpu they released a new driver that tags along with sandstorm and i noticed my nvidia shadowplay absolutely raping my fps after the driver update. Not sure if you're on the same boat as me but I also got a fps drop.