Need help with making mod work on server.

I've spent the past few months making a mod to be used on an online server. It works completely fine offline, but when added to the server it's laggy and i get kicked in exactly 1 minute by the server and given this error: "java.io.IOException: An existing connection was forcibly closed by the remote host."

MCreator version: 2022.2

Mod Version: 1.16.5

Plugins used: Kleiders Custom Renderer v.4.0.5 & Attributes 2.2.6

Edit: I also wanted to add that the mod works just fine when used in the server test environment, aside from running out of memory after a while. I even installed performance enhancing mods and a lag meter, and although they do allow me to stay a bit longer I still end up getting kicked. Also TPS goes from 20 to ? and back again constantly as the ping slowly rises to 5 digits.