HelpRemove same fog

Hello, forst of all sorry for my bad English, but i hope you can get my point.

So i have MW3 but i have really crappy laptop like T4200 2,0Ghz 3 gb ram and shitty gf G105m 512mb and a must play at lowest resolution its 640x480 i think (but dont remember) all setting i got on low :/ but still i got like 20-25fps max, sametime like >10 fps :/ And i know on pro mode i can play very god, becous here is no rain, or fog and same things with i cant off on options.

And i need your help guys its any way to get this same effect on normal game? not in dedi serwer with pro mode? any texture mode or something like that? damn i hope you can udenrstand me :<

Thanks

i think,u can to search something in ur mp cfg,u can off the rain,sun-shine,or another things of graphic and get more fps for good playing