Singpost lag spike the server

[123Kappa]

Hello!
I have a MCEternal server and whenever a player joins the server lag spikes.
It also happens when you do /signpost list.
Seems like the mod tries to get all the data from all players at the same time.

The only fix that I can think of is to delete that data.
Where is it stored?

[Serega007RU]

The problem is still relevant (for 1.12.2), has it been fixed on new versions?