I will say one thing, I have done a test with a Dell dimension E520, (old! like 2006 pc) but I am using 100 Meg connection, however the gears of war theme tweak works because it boosts your visual effect making your frames more stable, and i am also useing a HD series 6570 ddr 3 Saphire grafics card (useing DVI not HD), on the log on screen before logging into your account (this will constantly hit 60+ FPS) however in game it will reduce near safe zone areas (with people More fraps are used in units) only open area it will work properly (where there is less people) smart close programme will destroy any programmes used to boost net.4 and CCC etc, if you don't configure it properly to your own use.
your best aim is to get a HD graphics card and the GOW theme, and internet connection with more than 2 meg, thats all you need to boost. additional to that its your own choice to close down physical programms such as un-used sevice.msc programms. anything to do with visual effect dont touch it or u will fail in speed.