Consider simplex noise instead of/in addition to classical Perlin noise

[lhofhansl]

Simplex noise is computationally simpler and produces good results. See here:
https://www.bit-101.com/blog/2021/07/perlin-vs-simplex/

There seems to be a good implementation here:
https://github.com/SRombauts/SimplexNoise

Maybe something to consider to speed up map gen.

[Wuzzy2]

If at all, then it must be an addition, not a replacement, unless you don't mind breaking mapgen continuity for basically all worlds ever created.

[hecktest]

Are we even using proper perlin noise in the first place?

[kno10]

Are we even using proper perlin noise in the first place?

No. It's the simpler value noise, that is more prone to generate grid patterns. C.f., #15775