Copium

Name: Copium
Price: 8 EUR
Author: JupiterDev

Copium is a performance based modpack that strives to get the highest performance.

by JupiterDev

538 Downloads

0 Followers

fabricMC 1.21.5lightweightoptimization

Rent Copium Server

About this Modpack

Copium

A Performance and Quality of Life Clientside Modpack!

Copium seeks to fix Minecraft's performance issues, as well as add small features such as
Zoom, Shaders, Dark mode, and more! We only use client-side mods, so it should be able to be used on many servers.
Note that the pack does include a mini-map mod, so it may not be able to be used on some servers!

What if I want XXX mod added?

Create a Github Issue, and make sure to tag it as Enhancement! Alternatively, simply add it yourself!

Will you port the pack to Forge/Neoforge/Quilt?

No, this pack is exclusively for Fabric, and will stay that way for the distant future.

Copyright

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Available Versions

Copium 1.0.1 (1.21.1)release

MC 1.21.1fabric57 downloads

April 14, 2025

Copium 1.0.0 (1.21.1)release

MC 1.21.1fabric81 downloads

October 22, 2024

How to Set Up a Copium Server

Order Server

Choose at least 4 GB RAM (6 GB recommended for Copium). Based on player count: per 8 players.

Install Modpack in Dashboard

Open the modpack browser in the dashboard, search for "Copium" and click "Install". The fabric loader and Minecraft 1.21.5 are configured automatically.

Start Server & Play

Start the server – all mods are loaded automatically. Share the server IP with friends and play together!

Frequently Asked Questions

Copium server crashes or won't start – what to do?

Most common causes: insufficient RAM or wrong fabric loader. Check latest.log for "OutOfMemoryError" → increase RAM to at least 6 GB. For "Mixin" or "ClassNotFoundException" errors: modpack version and loader don't match. With Mado Hosting, loader and Minecraft version are auto-configured on modpack install – preventing most startup issues.

How much RAM does a Copium server really need?

Minimum 4 GB, recommended 6 GB for stable performance. per 8 players. Important: Minecraft modpacks need more RAM than vanilla – plan extra per additional player. With Mado Hosting, you can scale RAM up live at any time without data loss (from €8/month).

Can I add custom mods to Copium without conflicts?

Yes, but check compatibility: only use mods for the same loader (fabric) and same Minecraft version (1.21.5). Common issues: ID conflicts with recipe mods and incompatible coremod versions. The Mado dashboard mod browser only shows compatible mods and warns about known conflicts.

Copium server lagging – performance tips

1) Increase RAM to 6 GB+. 2) Reduce server view-distance to 8 (server.properties). 3) Pre-generate chunks with the "Chunky" plugin. 4) Use /spark profiler to check which mods consume the most tick time. With Mado Hosting, all servers run on NVMe SSDs with dedicated CPU cores – eliminating hardware as a bottleneck.