This question is most tailored towards L4D2, but can also be a general question.
Can anyone explain to me what exactly it does? I know it tells the game how much free processing memory it has, and I’ve noticed it seems to let me have smoother gameplay at lower framerates, but what I don’t understand how it effects the actual game. What are the advantages and disadvantages to having it on high versus low? Does it lower the visuals in any noticeable way?