Doom 3 on Steam Lags in FireFights :(

[Grenades4balls]

I bought doom 3 on steam for $3 not the bfg one the old 2005 one lol. The game doesn't lag when im walking down hall ways or in cut scenes but as soon as i get shot at or i fire my gun its lags like crazy. i know my current computer is good enought to run the game bc my friend can run it no problem and he has the same laptop. the specs of the laptops are amd e1-1200 4gb and a radeon HD 7310. is there a mod or tweek out there that will help it run smoother?im 2 hours into the game and i wanna finish it please help. i have tried to reinstall the game twice bit that didnt help and i keep my computer running better than my friend. (he doesn't clean it and he doesn't watch what he downloads if that matters) please help its such a good game :D

[Shadowmeph]

most likely bandwidth you can have the best PC but if your bandwidth is low or is being used like downloading things in the back ground it will cause lag check your Ping

[Grenades4balls]

im not playing in mp its all single player.

[ShinraCorp]

Originally Posted by Grenades4balls

im not playing in mp its all single player.

Have you checked your graphical settings to make sure it's not set on the maximum? Or if your Resolution is matched to your native one?