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There's nothing particularly hard about this, or special about javascript though. This is the kind of stuff you could've implemented back in the day and ran on a Pentium MMX. It's about having an efficient algorithm.

I agree, the speeds you can achieve with JavaScript are astounding. They are far superior to Python, it's a shame JS doesn't have that well of a support for scientific calculations.

If anyone could list what support there is that'd be really interesting.

Just a side note: Java used to be slow, but is actually a lot lot faster now. So while javascript is certainly impressively fast, Java is actually even faster still.

Although I believe this is true, I've used more fluid interfaces and played/have seen better performing demos/games in Javascript rather than Java.