Metal Gear Rising Revengeance - PC - Crazy Blade Mode Slicing

Played on thei5 4670k (overclocked to 4.2 ghz), GTX 770 GPU, and 8 gb ddr3 ram. Blade mode insanity seems to drop the FPS to 30 (add 5 fps for the recording). Yet the GPU usage stays around 50%. Cutting physics must be CPU bound.