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MemGuard project artwork

CurseForge · Minecraft mod

MemGuard

Reduces RAM usage in large modpacks and servers by deduplicating NBT strings and monitoring memory usage, without forced GC freezes.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which MemGuard release matches Fabric?

Updated 20 days ago
Best match for your filters MemGuardFabric v1.0.1
Game version 1.21, 1.21.8, 1.21.5
Loader Fabric

MemGuardFabric v1.0.1 targets 1.21, 1.21.8, 1.21.5 with Fabric. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.

Where it goes

Is MemGuard required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say
Dedicated server Source doesn’t say
Loader for this release Fabric
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does MemGuardFabric v1.0.1 need?

MemGuardFabric v1.0.1 on Fabric. Every mod below is checked against that same setup.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add MemGuard without breaking your instance.

Built for MemGuardFabric v1.0.1 on Fabric. Pick another file and the loader, install side or required mods may change.

  1. 01

    Stick to this file

    Use MemGuardFabric v1.0.1. It targets 1.21, 1.21.8, 1.21.5 with Fabric; another release may have different loader, side or dependency requirements.

  2. 02

    Bring the mods it needs

    This file does not list any required mods. Do not add a library just because a different file uses it.

  3. 03

    Put it on the correct side

    The project page does not say whether this file belongs on the client, dedicated server, or both.

  4. 04

    Pick the file you checked

    Use the “Get this file” button beside MemGuardFabric v1.0.1. It opens that exact file at the source.

About this project

What does MemGuard add?

MemGuard

Lightweight memory helper for modded Minecraft.
Deduplicates repeated NBT strings and keeps an eye on your heap — without ever freezing your game.

Minecraft 1.20.x Minecraft 1.21.x Forge NeoForge Fabric

🆕 Forge v1.0.5 — no more lag spikes

Older Forge builds (1.0.3 and earlier) forced a full garbage collection every 5 minutes and after every texture atlas upload. In big modpacks that meant a short freeze every few minutes. Version 1.0.5 removes every forced GC: tested in a 364-mod pack, the 609 ms freeze every 5 minutes is gone. If you use MemGuard on Forge, please update.

What MemGuard Does

Feature Description
NBT String Dedup Short, repeated NBT strings (item ids, keys, enum names) share one instance instead of being stored thousands of times. Lock-free and size-limited, so it never slows other threads down.
Memory Monitor Writes a short memory status to the log and warns when heap usage gets risky, so you know when a pack needs more RAM or a lower view distance.
No Forced GC MemGuard never calls System.gc(). The JVM's own garbage collector already runs at the right moments.

MemGuard is a helper, not a miracle: it does not promise specific FPS, MSPT or RAM numbers. For memory leaks, pair it with mods like AllTheLeaks or FerriteCore.

Supported Versions

Loader Minecraft Java Latest build
Forge 1.20 – 1.20.6 17+ v1.0.5
NeoForge 1.21.x 21+ v1.0.4
Fabric 1.21.x 21+ v1.0.1 (update with the same fix coming soon)

Check the Files tab for the exact build per version.

Compatibility Notes

  • Works alongside FerriteCore and AllTheLeaks.
  • Safe to run with -XX:+DisableExplicitGC (common in server packs).
  • If logs mention missing Create classes, check that Create and its addons are on the same update line (Update 5 with Update 5 addons, Update 6 with Update 6 addons). That is not caused by MemGuard.

Quick Install

  1. Install the loader for your Minecraft version.
  2. Put the MemGuard jar for your loader in the mods folder.
  3. Start the game and look for [MemGuard] lines in latest.log.

Support the Project

If MemGuard helps your pack, consider leaving a tip — it keeps the coffee ☕ flowing and the fixes coming!

Buy me a coffee on Ko-fi

Found a problem? Leave a comment with your latest.log — every report helps. 💙

Project description from CurseForge.

Pick your setup

MemGuard by Minecraft version and loader

Choose the version and loader you play, then open the matching release.

31 available setups

Showing the newest 12 of 19 game versions. Older files are in the list below.

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files

MemGuard versions and loaders

2 of 9 releases match
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Looking for an older file? The official CurseForge project page is in Resources.

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