New config add

[Pantera07]

bukkit.yml https://github.com/YouHaveTrouble/minecraft-optimization#spawn-limits

spawn-limits:
  monsters: 70
  animals: 10
  water-animals: 5
  water-ambient: 20
  water-underground-creature: 5
  ambient: 15

Add 'water-underground-creature'

https://github.com/YouHaveTrouble/minecraft-optimization#ticks-per

ticks-per:
  animal-spawns: 400
  monster-spawns: 1
  water-spawns: 1
  water-ambient-spawns: 1
  water-underground-creature-spawns: 1
  ambient-spawns: 1
  autosave: 6000

Add 'water-underground-creature-spawns'

There is a new entry in the bukkit.yml config so you need to add optimizations.

[Pantera07]

Example

spawn-limits

    Good starting values:

    monsters: 20
    animals: 5
    water-animals: 2
    water-ambient: 2
    water-underground-creature: 2
    ambient: 1

ticks-per

    Good starting values:

    monster-spawn: 10
    animal-spawns: 400
    water-spawns: 400
    water-ambient-spawns: 400
    water-underground-creature-spawns: 400
    ambient-spawns: 400

[YouHaveTrouble]

water-underground-creature is a limit for both glow squids and axolotls. The default of 5 seems ok, so for now there's no need to reduce it, especially to 1 per player, that would severely impact gameplay without much of a gain.

We'll see how things will pan out, but for now it's too early to make a decision to just put a limit on them.