I dunno, I don't get any lag and I have a laptop. But I agree on the polygons with bf3 weps, and regardless - those things throw up so many errors, it's ridiculous. I understand you don't really accept suggestions, but maybe try using T+T2 or some other weapon pack, it'd add more variety, and if it's T+T2 or some ammo using weapon, it'd solve the issue of indefinite spawn camping/otherwise unfair camping with some insta kill weapon.