🪼 Jellyfish

🪼 Jellyfish

Optimization and Enhancement combined with speed and ease of use

by bUmmy1337
931 Downloads
0 Followers
fabricneoforgequiltMC 1.21.11lightweightmultiplayeroptimization

Screenshots

FPS
Cover Image
Jellyfish logo

About this Modpack

Jellyfish

Introduce

Have you ever imagined that your old computer would be able to run Minecraft at 80~100+ fps? Well, now it's real!
Using Jellyfish, you can experience incredible pleasure while playing your favorite game. The modpack optimizes your game, and also slightly visually updates it.

If you don't want visual modifications, try Bromum, there is nothing extra, only game optimization

Why Jellyfish?

The goal of Jellyfish is to help players launch Minecraft with incredible speed and ease, as well as comfortably play without lags and with support for only useful Optifine features. In order not to clutter your settings, useless Optifine features will not be included in the modpack.

For launchers that don't support the .mrpack file format, I provide zip files for mods and config files on my Discord Server and the .zip archive will also be attached as an additional file on the modrinth downloads page.

Works everywhere

Jellyfish doesn't add any additional content to the game, allowing for compatibility with most any world or server.

Support and Issues

If you have an error or just need help, contact my discord server. There I will help you and tell you how to fix various problems

It is recommended to play with a licensed copy of the Minecraft Java game!

Start playing with Jellyfish now, optimize your game and enjoy the gaming process like never before!

FPS Image

Special thanks to Simply Optimized for their optimization configs.

Available Versions

🪼 Jellyfish 4.2.0-fabric_sodiumrelease
MC 1.21.11fabric25 downloads
February 4, 2026
🪼 Jellyfish 3.0.0 - Rethinkedrelease
MC 1.21.5fabric62 downloads
May 24, 2025
🪼 Jellyfish 2.1.3-fabric_vulkanrelease
MC 1.21.1fabric50 downloads
December 21, 2024
🪼 Jellyfish 2.1.3-neo_sodiumrelease
MC 1.21.1neoforge43 downloads
December 21, 2024
🪼 Jellyfish 2.1.3-quilt_sodiumrelease
MC 1.21.1quilt39 downloads
December 21, 2024

How to Set Up a 🪼 Jellyfish Server

1

Order Server

Choose at least 4 GB RAM (6 GB recommended for 🪼 Jellyfish). Based on player count: per 5 players.

2

Install Modpack in Dashboard

Open the modpack browser in the dashboard, search for "🪼 Jellyfish" and click "Install". The fabric loader and Minecraft 1.21.11 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

🪼 Jellyfish 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 🪼 Jellyfish server really need?

Minimum 4 GB, recommended 6 GB for stable performance. per 5 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 🪼 Jellyfish without conflicts?

Yes, but check compatibility: only use mods for the same loader (fabric) and same Minecraft version (1.21.11). 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.

🪼 Jellyfish 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 🪼 Jellyfish Server

Start your own server with automatic modpack installation.

Recommended RAM:
6 GB(min. 4 GB)
From €8.00 / 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

1.21.111.21.51.21.11.21

Start your 🪼 Jellyfish Server now

From €8.00/month with 6 GB RAM for the best performance.

Configure Server →