I am pretty certain that the human eye cannot distinguish the difference of anything above 30fps or thereabout?
Using a three year old laptop, listed below, and settings at 1680x1050/forest off/building amount low/land shading low/grass off/shadows off/roads on/everything else medium. In my nvidia console I have 2xAA 4xAF force vsync set to override application. I get average 33-36fps with high of 60(73 with vsync off) and low of 5 on black death.
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