I tried those Settings and they boost the fps rate (without AFR2 I have less than 20 fps).
I have 2 MSI 770 2 GB Twin Frozr and a Custom 3 Monitor Setting - left and right 1920x1080, Center 1920x1200. The Settings are optimized to have a seamless Impression. Which of course costs some fps.
Limiting the fps to 30 keeps it at a stable rate of 30. Unlimited it ist typically at 35 but drops to 25 from time to time for a short period.