BF4 runs the same at any graphics setting, but FPS changes with map size?

Aut0tr0ph

Honorable
Jun 9, 2012
10
0
10,510
If I get the same FPS running any graphics setting for BF4, but my FPS only changes when there are changes in the server map size, what component of my computer should I upgrade? I'm thinking RAM, but I'm not sure. Any help would be really appreciated.