Great job guys !!

[mgueydan]

Being more and more specific.

I read that :
- mobs spawn close to players
- mobs far from players doesn't move
- mobs really far from player have chance to despawn
- mobs really really far from player automatically despawn

I suggest that it would be more accurate to manage thoses 4 actions in a Row.
Right now :
- Mobs Tick() are called from Chunks
- Mob spawn is called from World.
- I'm not sure if Mob despawn is called

Applying the above rules would induce two or three different Player-to-mob distance calculation is a single tick.