My laptop which has an Nvidia 640m, 10GB Ram and an i5 2467m can play Battlefield 3 at 60fps on medium settings.
When I run my C2 project "Orbit" without any background art I get 60fps but when I try to run it after my buddy has added artwork it drops to about 12fps.
If I remove all of the webGL effects like glow and additive blending on the lights etc the fps jumps up to about 25.
The rest of the scene is made up with about 20 - 30 64x64 9-patch objects.
Is there anything I should really watch out for when importing art? Does it matter what quality png's we're adding to the game? Keep in mind that the game was running at 60fps before the art went in, so it's unlikely to be anything in my code screwing the frame rate.