Very high ping on Fabric server - How to fix?

The Aternos forums are now deprecated

Learn more about this change here.

For help regarding Aternos, we recommend you to visit our support center.

  • Me and my friend are having to deal with very high (1000+) ping on a modded fabric server (check the attached image). The thing is, we also have a modded forge server and a vanilla one, and both of them run perfectly, so I don't believe our location (Brazil) is the issue here. What could be causing this, and how can I fix it?