Adjusting your Computer's speed to your Monitor's speed: Most monitors cannot paint accurately faster than 66 to 77 frames per second (fps). Click on the Use Speed radio button and then set the Delay (between iterations) slider so that when you push the Play button the fps indicator (next to the Play controls) falls somewhere between 25 and 66 fps. In that range you should experience apparent motion effects. If your computer is slow, you may not need to use the Speed control. NOTE: Changing Window Size changes fps (smaller windows paint at a higher speed in fps), so you may have to adjust speed when you change Window Size.