My friend at work, Jonathan, just got a new computer, with a dual-core processor, large flat panel monitor, and a good video card, and he ran my Abound Screensaver, maxing out the number of active balls at 100 with no drop in frame rate!
 
I have never seen a computer that could handle that many balls until today, and it was truly mesmerizing to watch that many balls bouncing off each other and around black holes. The After Dark “Marbles” screensaver creator would be proud!