How do I install Memory Leak Fix?

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. Opens on Modrinth — not every file is mirrored on our own servers.

What Minecraft version does Memory Leak Fix work with?

The listing gives Minecraft 1.17, 1.17.1, 1.18, among others. This is the version stated by the author or source site, not something we verified ourselves.

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Memory Leak Fix

Java mod listed for Minecraft 1.17–1.20. File opened and checked on 27 Sep 2026; downloads from the MC Java Mods app on Android.

by FX · on Modrinth

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Mod loader Fabric1 build
Mod loader Forge1 build
Mod loader Quilt1 build

Minecraft version

Minecraft 1.18–1.20.4Newest

Minecraft 1.17.1–1.20.4Newest

Minecraft 1.18–1.20.4Newest

⬇ Download for 1.18–1.20.4 · Fabric ⬇ Download for 1.17.1–1.20.4 · Forge ⬇ Download for 1.18–1.20.4 · Quilt

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MC Java Mods Get it on Google Play →

Memory Leak Fix

A mod that fixes multiple memory leaks in Minecraft. Both server-side & client-side

For the best performance & memory usage, I recommend using this mod with:

lithium-fabric - The best general performance mod
FerriteCore - Memory usage optimizations

My other optimizations/fixes

MoreCulling - Changes how blockstate culling is handled to improve performance
Carpet-Fixes - Largest Server-Side bug fixing mod
Blanket - Client-side tweaks/fixes
RailOptimization - Make powered rails less laggy

Minecraft 1.20.5+

All the memory leaks in minecraft previously fixed by MemoryLeakFix have been fixed. Making this mod obsolete in future versions of the game.

More Info

Feel free to contribute to the project!
I'm also fine if you use this mod in your modpacks, just make sure to mention it.

However I don't allow clients or other projects to merge this mod without permission, if you would like to use this mod in your client or another project please contact me.

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 1.17, 1.17.1, 1.18
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 Modrinth — 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.

File checked by MCModsHub

Ships as memoryleakfix-forge-1.17+-1.1.5.jar — drop this file into the mods folder
Download size: 223 KB
Download link checked 24 Oct 2026 — working

These come from our own check of the pack file, not from the source page.

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