Pro_Axe_GamingI got some benchmarks for Comanglia's config vs mastercomfig:
Resolution 1024x768, 4:3 aspect ratio
CPU: i3-6006U
GPU: Intel HD 520
mastercomfig, dxlevel 9.0
2639 frames 34.090 seconds 77.41 fps (12.92 ms/f) 6.579 fps variability
mastercomfig, dxlevel 9.1
2639 frames 33.606 seconds 78.53 fps (12.73 ms/f) 6.422 fps variability
Comanglia's Config, delevel 9.0
2639 frames 34.357 seconds 76.81 fps (13.02 ms/f) 6.497 fps variability
Comanglia's Config, dxlevel 9.1
2639 frames 33.796 seconds 78.09 fps (12.81 ms/f) 6.524 fps variability
So my experience is that the difference is negligible, but it does seem to help performance when I'm recording ingame.
Are you using the igpu addon? Also, what preset are you using?