Slower on a faster ocmputer and better video card

Hey, I made a little OpenGL thing where a square is spinning. I ran it on my computer, which is a P2-233 with 224 MB ram and a Riva TNT2 video card. I downloaded the program at a friends house, he’s got a 1.3GHz with ummm … 128 megs of ram i think, and a GeForce3 … i think. On my computer it ran very fast and on his it ran pretty slow. Why would it run slower on his even though he’s got a better computer/video card?