Dynmap does this well, I would like to do this on squaremap or Pl3xMap because of performance.

What is the difference between this plugin and Pl3xMap? I can't choose. :/

https://github.com/BillyGalbreath/Pl3xMap/issues/173
I can learn java and do it, but I can't really be bothered.

Never mind squaremap is extremely fast.

squaremap is a fork by jmp (also codeveloper) of the original Pl3xMap V1
it was created when the original author (Billy) stopped developing for V1

Pl3xMap V2/V3 is a rewrite to improve speed by Billy