If you are using a 32-bit screen environment, try 16.
If you are using a high resolution, try a lower one.
Put less fish in the tank.
Press the down-arrow key to lower the Sleep() number. The lower the number the more the Aquarium hogs clock-cycles, and the less are available for other programs.
If you have Full-Screen-Antialiasing turned on in your card's video settings, turn it off.
Bear in mind that anything over about 60 is overkill. One frame of animation for each screen-refresh of the monitor is optimal. More than that and the intermediate frames are calculated and drawn internally, but never make it onto the monitor.
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