So, I was just looking around at some pattern functions, and having played with
some Perlin noise in the recent past, thought that I'd read up on it a bit more
- specifically it's exact implementation in code.

Does POV-Ray currently use original or improved noise?

http://flafla2.github.io/2014/08/09/perlinnoise.html


Also, I came across this which touts a doubling of speed:
Perhaps someone can test this out and see if POV-Ray can benefit from this.

http://riven8192.blogspot.com/2010/08/calculate-perlinnoise-twice-as-fast.html

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