The r_lodCurveError controls distance at which curves are dropped (it makes the objects more rough after a distance).
Values: between “0″ (always drop curves) and “10000″ (never drops curves)
Default: “250″
Setting r_lodCurveError to a smaller value helps (increases) your FPS (Frames per Second), so you will be able to see the movement smother.
Enjoy ^^
PS en gros, si vraiment tu es a la recheche de FPS : --> seta r_lodCurveError "10000" (suivi d'un vid_restart) sinon laisse par défaut