Seems to be since 5.55 that when selected a framerate option of 1/2 or below, the framerates drop significantly more. None and Refresh Rate 1/1 are unaffected.

I am playing on 144hz monitor, so if I select 72 fps (Refresh Rate 1/2), it drops to a fixed 12fps. If I cap frames through geforce works, but it is less smooth than with Refresh Rate 1/2.

Has anyone encountered this?