cern

Name: cern
Price: 8 EUR
Author: alpha11000

ONLY optimizations, nothing to decrease fps

by alpha11000

170 Downloads

0 Followers

fabricMC 1.21.5lightweightoptimization

Rent cern Server

About this Modpack

everyone else complains about getting only 100 fps but us, the ones struggling to get 60, are the ones who really need it. that's who this is made for.

i've tried to collect every mod that claims to optimize the game, even if they might not be super compatible. there is no extra fluff or features like capes or mods which add optifine features. it is completely bare.

it doubled my FPS while decreasing gpu and memory.

A screenshot with the pack showing 109 FPS, 69% GPU usage, and 41% Memory

A screenshot without the pack showing 58 FPS, 100% GPU Usage and 71% Memory

Available Versions

cern 1.0.2beta

MC 1.21.5fabric54 downloads

June 28, 2025

cern 1.0.1beta

MC 1.21.5fabric23 downloads

June 28, 2025

cern 1.0.0alpha

MC 1.21.4fabric93 downloads

December 28, 2024

How to Set Up a cern Server

Order Server

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

Install Modpack in Dashboard

Open the modpack browser in the dashboard, search for "cern" 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

cern 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 cern 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 cern 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.

cern 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.