If you are experiencing frame speed fluctuations, please update to the latest video drivers, then use the -memrestrict commandline. Please do not use any other commandlines as they may override the effects of this one. Start at the lowest number based on your texture setting (ie. try them one at a time) You can try to increase the number until you notice stuttering again.   -memrestrict 188743680 LOW TEXTURES (256M Video Cards) -memrestrict 209715200 -memrestrict 230686720 -memrestrict 2