Wow, just got around to reading your post, sorry about that.
As I stated before, the most intensive part is the post processing going on to achieve the noise + vignette + bloom + fisheye + motion blur + DoF + Fog + SSAO, which does not rely on the video card as much. Instead the post processing is very cpu intensive for those effects, even though some of it is achieved through shaders as well. But each one requires another pass from the cpu to the gpu and back. If we count those, then there are 8 passes not including the original render passes.
I have gone back to check on the brightness of it, and have added bounce lighting to the bathroom and bedroom. I also tested and retested the closest event. The closet event for the jacket is working properly. The event that might be throwing you off is the secondary mirror event, which has no sounds to lead you back to it. This one people might have trouble with more so than others. I have added a sound to this event as well.
I have also added the option to remove the post processing effects.Turning these off should improve your performance. Press the 2 key on the keyboard to toggle them on or off.
Other changes: Slowed movement speed, and increased amount of footsteps heard to correspond with slower movement.