There are several things you could try. I'm not sure which type of "jerkyness" you are experiencing, so I'll just try to cover them all. If it's due to a low frame rate, you could try to increase it by switching to a 16-bit resolution. You have a fairly high-end card, so I doubt if that's your problem.
You could also increase the program's "time-slice" by using the down-arrow to decrease the "Sleep()" time for each frame. When it get down to zero or -1, other programs might have trouble getting enough clock-cycles to run.
If overhead from another task is grabbing too much of the Aquarium's share of resources, you can increase the Priority by hitting the Q key. This currently just increses it one step, as my program really shouldn't steal too many clock cycles from more important ones.
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