thanks gugla, I find similar behavior when I scope onto grass, but only when I maxed out graphics from 4x to 8x atoc. But 35fps with 8x instead of 50fps with 4x with a heavy overclocked 290x? gpu utilization is on 100%.

same here. Especially with sniper rifle zoomed in on broccoli-trees:
-standing: 50fps
-prone: 25fps.

specs: R9 290 @ 1200mhz core/6400mhz ram, 3570k @ 4.9ghz and same behavior with GTX570 before.