Gamers usually want this one, because they want to know how much FPS (Frames Per Second) so they can compare with other people. 
It’s actually pretty easy in Ubuntu. 
1) Open up Terminal and type/paste this command:
glxgears -printfps
A window should popup and the frames per second data will be in Terminal – I got about 1900 in 5 seconds, how about you?
I got 28400 in 5 seconcs =) just installed.. Thanks…
2814 on my hideous integrated graphics with 3d accelerated.