Connectivity Problem with Minecraft - My friend is having problems with lag

System Information

Field Value
Operating System Linux - Debian GNU/Linux 12 on x86_64
Product AMP ‘Callisto’ v2.5.0.12 (Mainline)
Virtualization Docker
Application Minecraft
Module MinecraftModule
Running in Container Yes
Current State Ready

Problem Description

Issue

The lag problem happens only with him but i still playing smoothly.
I don’t know if the problem is with some server config or what.

Reproduction Steps

  • Enter the server
  • Play for a couple of minutes
  • The lag starts

If the server’s TPS is 20, then it’s a problem with your friend’s minecraft client, their network connection, or their machine

His game was smoothly as mine not too long ago, but suddently this lag started.
And he loses connection after some lagging every time.