They should make simpler 3d models to players who have weak video card. That way they would get more players because more people could then play game.
It's not really about that, as far as I know. As was said, FS is all about big numbers. The space maps are 8x8 km, Mos Espa has far, far more buildings than, say, Karkand, Endor Strike Team has literally thousands of trees...
Just turn down your graphics setting. I play it with everything on low except Terrain and Textures (which can be set to high without performance loss), View Distance at 100% (obligatory anyhow), and lately I've turned Lighting and Dynamic Lighting on.
"One of the bitches actually gave birth while she was attacking, and her puppies joined in on the carnage."
--the awesomeness that is Boatmurdered.