I changed 60 to 120, didn't really have much of a diference. What you can do, is time how long the render takes, start a timer at the beginning of the loop, do the game logic, moving player..etc, see long long you have left, take away the render time, then wait that long till you do your drawing of images and flip.
That should keep you code running smooth on different set ups :o)
That should keep you code running smooth on different set ups :o)