DefCore Optimization

DefCore Optimization

Awesome sodium base optimization modpack on fabric.

by DefomCode
15.9K Downloads
0 Followers
fabricMC 1.21.10optimization

Screenshots

standing still with 32 chunks
In-flight performance with 32 chunks
standing still with 16 chunks

About this Modpack

DefCore Optimization Modpack

DefCore Optimization Modpack - this is a optimization fabric modpack based on sodium. It adds optimization of different areas of the game. Render optimization, RAM optimization, fix of some errors, changing the light rendering, etc.

The modpack is based on sodium, and about a quarter of mods depend on it or are recommended for sharing. Why not optifine? Because the optifine is outdated and sodium copes with optimization much better (when using additional mods)

Optifine features

This modpack allows you to use most of the optifine features, such as shaders, approximation, custom 3d renaming models.

Why this modpack and not others?

General Optimization

This modpack is ideally optimized for both weak and powerful PCs. It shows good AND MOST IMPORTANTLY stable performance, compared to other optimized modpack

Saving time

Also, this modpack is extremely convenient to use due to the removal of some loading screens. This allows you to save time and not be distracted by the download screens.

FPS stabilization

Fps is stable when loading fragments and does not jump due to the c2m mod, also due to more culling and entity culling, you can make large farms and at the same time not feel lags, hiding mobs behind buildings.

Сompatibility

Also, this modpack will work on all servers or single worlds, as it does not introduce new content, but only optimizes and improves the gameplay

Based on fabric

Fabric is a more optimized core than forge. Mods for it come out faster and are updated regularly and has excellent support for mods.

Available Versions

DefCore Optimization 1.1.1release
MC 1.21.1fabric238 downloads
November 27, 2025
DefCore Optimization 1.0.0release
MC 1.21.1fabric122 downloads
September 19, 2025

How to Set Up a DefCore Optimization Server

1

Order Server

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

2

Install Modpack in Dashboard

Open the modpack browser in the dashboard, search for "DefCore Optimization" and click "Install". The fabric loader and Minecraft 1.21.10 are configured automatically.

3

Start Server & Play

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

Frequently Asked Questions

DefCore Optimization 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 DefCore Optimization 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 €5.2/month).

Can I add custom mods to DefCore Optimization without conflicts?

Yes, but check compatibility: only use mods for the same loader (fabric) and same Minecraft version (1.21.10). 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.

DefCore Optimization 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.

Rent DefCore Optimization Server

Start your own server with automatic modpack installation.

Recommended RAM:
6 GB(min. 4 GB)
From 5.20 / month
Create Server Now
1-Click Modpack Install
NVMe SSD Storage
DDoS Protection included
Automatic Backups

Details

License
MIT License
Server-side
Unsupported
Client-side
Required

Supported Versions

1.21.101.21.81.21.1

Start your DefCore Optimization Server now

From €5.20/month; 6 GB RAM is recommended for best performance.

Configure Server →