I believe you have to turn AA down or turn on vsync. Forgot which.
I turned off Multicore Rendering and put the Anisotropic Filtering to 8X because it had the * next to it
Goddamnit, Super DOF freezes my Gmod whenever I click "Render".
Does it literally freeze and nothing else happens? Or does it freeze but then come back with the now rendered DOF picture? Depending on your computer, it may take some time to render the DOF