Spigot 1.13 latest
VoidSpawn 1.17.0

While moving up or down through water (or "bobbing" on the surface), the vs.enable permission is checked every tick. The ocean floor is at Y=46 in the test scenario, nowhere near Y<0. This seems unnecessary.

Thanks for reporting this. I will change this for the next patch. Will move it after the detector check.

This is true for water of any kind: ocean, river, pond.

If 100 players decided to do this, it would have a negative impact on TPS.

Thanks.

vs.enable also seems to be checked continuously when the player is not in water, just moving around on any surface. Every 2 ticks or so.

It is not clear why the permissions need to be checked at all until a player passes into the void.

Ya, that is an error on my part. Happened when I did a small refactor.