In my feelings, these jerks come of disk or stalls the engine (if any DRM? It would not be the first time), and not especially an optimization problem because the game proves otherwise fluid even in ultra.
tested i7 3930K, 16GB RAM, 128GB SSD, Geforce GTX770
edit: I forgot to mention the host of bugs, even after a patch 800MB (!!!). Including the one I just met: a kinematic who does not engage in killing and forces the process ctrl + alt + extra becaufe the options are not available during a cutscene, even if the latter did not launched. The great class for a blockbuster. I take a star.