OS: Windows 7 Home Premium 64-bit SP1
CPU: AMD Phenom II X4 965 (3.4Ghz)
GeForce GTX 560Ti 1GB (EVGA)(1920x1080@60Hz)
I've played with all the settings (including turning shadows off) and still get graphical stuttering that becomes progressively worse throughout the chapter. The stuttering usually gets worse in high action sequences.