Optifine On Fabric

A Modpack That Strives to Get as much Performance as possible while re-creating many features from the Optifine Mod In Fabric

by GDT

27.0K Downloads

0 Followers

fabricMC 1.21.9lightweightoptimization

Rent Optifine On Fabric Server

Screenshots

About this Modpack

Optifine In Fabric

A Pretty Bad Remake of Optifine In Fabric - GDT

CURRENT MINECRAFT VERSION = 1.21.8

Chance Log

Updated to 1.21.8

Banner

Like This ModPack? Then Check Out Better Horizons!

Features

Animatable Game Textures
Optifine Capes
Faster Chunk Loading
Dynamic FPS
Dynamic Lights
Entity Model & Texture Features
Enity Culling
Shader Support
stable 60 FPS
Zooming
connected textures
fog control
Mod menu
More animations
better advancements menu

Features May Be Added in The Future

Included Mods

Animatica
capes
Dynamic FPS
Dynamic Lights
Entity Model Features
Entity Texture Features
Entity Culling
Fabric API
Fabric Language Kotlin
Indium
Iris
Lithium
OptiGUI
Reese's Sodium Options
Sodium
Sodium Extra
WI Zoom
continuity
better advancements
fog
mod menu
more mob variants
And More

Some Mods May Be Replaced, Or Others Configured Differently In the Future

What it has From Optifine

Shaders | yes
Dynamic lights | yes
FPS Boost | yes
Better Grass | no
FOG Control | yes
Zoom | yes
Random Mobs | yes
Hd Texture Support | yes
Variable render distance | no
Smart Advanced Opengl | no
Connected Textures | yes

Default Keybinds

Zoom = C
Copy Inspection To ClipBoard = F12
Reload Shaders = R
Shader pack Selection Screen = O
Toggle Shaders = K

All Keybinds Can Be Changed In Settings
Keybinds May Change in The Future With later Versions

QNA

Q: How Do I Report Bugs?
A: On The Discord
Q: can i use This Modpack On A Server?
A: Yes, Any Servers that allows Vanillia Clients Will Allow You To Play
Q: How Can i Suggest Mods To Make The Modpack A better experience?
A: On The Discord In The "Suggestions" Forum

known Bugs

game crashes while in a world and you enable connected textures in V2

Need Help? Or Just Wanna Chat? Check Out The Discord!

FPS

This is on

7 Chunks
6 simulation distance
clouds fast
weather fast
Leaves fast
And
Graphics Fast

Note That This ModPack Is primarily For Optifine Alternatives so it Works with Pretty Much Any Mods You Can Think of, Or To play Vanilla

Available Versions

Optifine On Fabric V3.9 for 1.21.9release

MC 1.21.9fabric1.7K downloads

October 27, 2025

Optifine On Fabric V3.8release

MC 1.21.8fabric872 downloads

September 2, 2025

Optifine On Fabric 3.7release

MC 1.21.8fabric241 downloads

August 21, 2025

Optifine On Fabric 3.6release

MC 1.21.1fabric456 downloads

August 19, 2025

Optifine On Fabric V3release

MC 1.21.1fabric3.7K downloads

August 30, 2024

How to Set Up a Optifine On Fabric Server

Order Server

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

Install Modpack in Dashboard

Open the modpack browser in the dashboard, search for "Optifine On Fabric" and click "Install". The fabric loader and Minecraft 1.21.9 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

Optifine On Fabric 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 Optifine On Fabric 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 Optifine On Fabric without conflicts?

Yes, but check compatibility: only use mods for the same loader (fabric) and same Minecraft version (1.21.9). 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.

Optifine On Fabric 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.