Good point about choosing the right type of floating point numbers.
Conclusion: when there's enough space, always pick double over float.
Tested with GDC in win64. floats: 16.0s / doubles: 14.1s / reals: 11.2s.
I thought to myself: cool, I almost beat the 13.4s I got with C++, until I changed the C++ code to also use doubles and... got a massive speedup: 7.1s!

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