UIs are really slow to load

[JuliGame]

2026-02-07.17-11-39.1.mp4

No errors on console

[JuliGame]

This only happened after implementig some optimizations on server.properties, bukkit.yml spigot.yml and paper configs.
I have no idea what caused this, after deleting all configs, it works fine.
Do you know what parameter could be causing that? Thanks.