The r_lodbias determines the geometric detail level 0 = high, 1 = medium, 2 = low 3 = custom
The r_lodCurveError controls distance at which curves are dropped
The r_dynamiclight turns dynamic lightning on or off. Setting r_dynamiclight to “1″ it helps (increases) your FPS (Frames per Second), so you will be able to see the movement smother.
Example: a rocket passing near you and lights the objects around it or explosions that give light.
The r_flares show or not a flare effect around certain dynamic lights
Giving r_subdivisions a lower value it gives you smother curves of objects around you.
r_lodscale - set this to 4, so some trees & bushes wont be drawn on distance
r_texturebits: Textures quality
r_picmip Sets maximum texture size. 0=highest detail;8=unbelievably ugly.
Try execute these:
r_lodCurveError (unknown values, try yourself the lowest)
r_subdivisions (unknown values, try yourself)