Cezium

Name: Cezium
Price: 8 EUR
Author: leaife__

fun modpack with mostly optimations and some biomes and other tweaks (not very tested) i dont know the stibility of this pack yet.

by leaife__

129 Downloads

0 Followers

fabricMC 1.21.1lightweightoptimization

Rent Cezium Server

About this Modpack

simple(ish) modpack for fabric 1.21.1

this is a modpack with about 100+ mods with:

sodium with a bunch of addons for it
world gen changes
boimes mods like; biomes oh pleanty, oh the biomes we go
sounds
sounds pysics remastered, ambiant sounds
lightning with dynamic sounds
3rd person camra improments
visual improvents; like, particarls, particle rain
world height changes from techtonic
dynamic lights
true darkness
voice chat
essiencal
and more

this pack has only been tested on my device that is a surface 5 pro, with a intel i7 7th gen quad core with a 640 intagrated graphics.

i dont know who stable the pack is, i have only brefly tested it and would like feedback if possible for improvements

you can edit this pack as much as you want any change anything i dont care if you publish your own veriton at all

v1.5 adds; stability improvements, farmers delight, seasons, waystones, backpacks, and more

Available Versions

Cezium 135 Czrelease

MC 1.21.1fabric28 downloads

November 17, 2025

Cezium 134 Czrelease

MC 1.21.1fabric26 downloads

November 8, 2025

Cezium 133 CSrelease

MC 1.21.1fabric22 downloads

November 6, 2025

Cezium 1.5.0release

MC 1.21.1fabric25 downloads

November 4, 2025

How to Set Up a Cezium Server

Order Server

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

Install Modpack in Dashboard

Open the modpack browser in the dashboard, search for "Cezium" and click "Install". The fabric loader and Minecraft 1.21.1 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

Cezium 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 Cezium 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 Cezium without conflicts?

Yes, but check compatibility: only use mods for the same loader (fabric) and same Minecraft version (1.21.1). 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.

Cezium 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.