So basically if i do it the way you describe above...my game loop cycles as fast as the machine will allow, and the sprite will change after a certain amount of time, determined by the that specific sprite, not the game loop? This is how im thinking you would do that ( correct me if im wrong )...Instead of setting a constant time for the loop, let the loop run as fast as possible, and time each cycle...keep summing up the time it takes the cycles until it hits a pre-determined value within the sprites structure, then update the sprite to the next in the animation sequence, and start the timing over again. This seems like a very efficent way to control animation, and it looks like this would make sure that the animation runs the same speed on other computer. Thanks for the info.