Devs may want to look at any changes made to the foliage, cause it is causing massive drops in fps, especially when zoomed in on. Prior to 1.03 zooming in would actually cause a slight increase in fps. Now, however, zooming on grass, or leaves causes drops as much as 20-30 fps. Missions that were playable with grass on full are a complete wreck now, when its knocked down to 15 fps when I zoom in to fire. I've got object detail on normal. I can't imagine how bad it would get if I turned it up to highest...my system would probably grow a hand and slap me in the face for trying.
Hopefully you are, or will look into this.