On: Making a falling sand simulator

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Is there a better way to build cute little canvas or browser games?

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One simple improvement would have been to pause simulations as soon as system comes to rest.

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I was thinking - maybe JS is not the way to do this? Maybe to write similar things one should do it in WebAssembly. Thoughts? I mean, even with paused simulations, I don't see why an i7 CPU should be working at 100% just to draw something on a tiny window in a browser. It seems like a flaw in canvas and JS to me.