There is a very small set of humans who should be implementing their own performance-intensive numerical computing routines, in any language. Should I happen t

There is a very small set of humans who should be implementing their own performance-intensive numerical computing routines, in any language. Should I happen to wander into a problem space that needs this stuff, my choice will be how many minutes to spend Googling for a decent free library, or whether to license a commercial one. On the shoulders of giants...