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    <p>A few observations, although I don't think any of them will help much.</p> <p>The main thing is that you're painting off of the AWT thread. Override paintComponent() and instead call repaint() on the object. This can cause all sorts of problems otherwise.</p> <p>You recreate colors every frame. This may or may not be one of those things that you want to cache. I don't think though that having a constant for your colors is likely to screw up GCing and will make things easier to keep straight when you want to reuse colors later.</p> <p>You redraw the entire window every frame. You just need to repaint the sections that changed.</p> <p>You don't need to draw the background. Set the background color and let the parent take care of everything.</p> <p>As a design thing, the bodies should be in charge of drawing themselves. Their owner should notify them that they need to be drawn rather than drawing them.</p> <p>The bodies recreate their state every time. Consider having them store it between times and mutate them as needed. You may be spending a lot of time doing trig calculations in the drawCircleBody()</p> <p>Something to consider is setting up a timer rather than using a sleep in a while loop. This will get you a more consistent frame rate, but you need to make sure that you can actually meet your obligations (or coalesce multiple frames into one if you miss a deadline) or you'll end up creating too many threads.</p> <p>Consider using a <a href="http://java.sun.com/javase/6/docs/api/javax/swing/SwingWorker.html" rel="nofollow noreferrer">SwingWorker</a> to do the calculations, then update the state in the done() method, finishing by calling repaint().</p> <p>These are just a few things. You should experiment to see what works and what doesn't. It's been a while since I've done Java graphics drawing.</p>
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    1. USJames
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    1. COThis is the answer, I wish I had a +4!
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      1. USBill K
    2. COThanks for the detailed answers. Regarding the 1st point, do you mean that I should have extended e.g. JPanel instead of JFrame and then override its paintComponent()? Because JFrame does not have such a function for me to override. Regarding the last one, that would also have the added bonus of making my app scale well to more than 1 cpu/core, right? Because then most of the calculation work happens in a thread separate from the GUI?
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      1. USIdo Yehieli
    3. COYes, it should probably be a JPanel. It should extend a JFrame only when you need to change actual window behavior: you actually draw on its content pane (which you can set to be a JPanel). As for scaling, this may not scale as well as you think it will since some of the work has to be done sequentially. In particular, each frame has to be done sequentially. However, future JVMs may actually be able to do some multi-core optimization for you.
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