FerriteCore (Fabric)
Java mod listed for Minecraft 1.16–1.21. File opened and checked on 26 Sep 2026; downloads from the MC Java Mods app on Android.
⬇ Download on CurseForgeThis page is for the Fabric version. If you are looking for the Forge version you can find it here.
This mod reduces the memory usage of Minecraft in a few different ways. A high-level technical description of the changes is available here.
The amount of memory saved will depend on the pack. In version 2.5.9 of All Of Fabric 3 it reduces the RAM usage (heap size) from 1,792 MB to 984 MB.
These values were measured after generating a world with a fixed seed and waiting for two minutes. You may notice that the setup is different from the Forge version, where I compared memory usage at the title screen. This is because Forge populates some caches (which are optimized by FC) before the title screen, while Fabric (and vanilla MC) wait until a world is loaded.
The project picture is a cropped version of this picture.
FAQ
Should I install this on the server or just on the client?
Some optimizations are client-side only, but there are some rather high-impact optimizations that are relevant on the server too. So you should install it on both sides.
Is this compatible with [other mod]?
Most likely yes. The only exception is Hydrogen, which is compatible with all recent FerriteCore versions on Minecraft versions where Hydrogen is officially released. This means that 1.18+ builds are not compatible with Hydrogen, since it has been officially archived and won't receive any releases on these versions.
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.11, 1.21.9, 1.21.10
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
FerriteCore (Fabric) is a free Minecraft Java mod. Compatible with Minecraft 1.21.11, 1.21.9, 1.21.10, 1.21.5 and newer. Downloaded 77,636,949 times (via CurseForge). Download it and open it directly in the game.
