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Compact Machines Preview FixerMinecraft mod for 1.21.1

Fixes the severe memory leak when previewing Compact Machines rooms. Opening a preview can chew through hundreds of MB to multiple GB of RAM that never gets freed, eventually crashing the game. This client side mod cleans that up.

newest supported release 1.21.1TechnologyBug Fixes
Latest version
cmpreviewfixer-21.1-1.1.0.jar
Minecraft
1.21.1
Java
Java 21+
Loader
NeoForge
Licence
not stated
Downloads
1.0M
Updated
2 mo ago
Available on
CurseForge

Minecraft versions

Every version Compact Machines Preview Fixer declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge21+declared8 Aug 2024

Download

From Compact Machines Preview Fixer’s own host. Nothing is re-hosted here.

Most recently published release

cmpreviewfixer-21.1-1.1.0.jarrelease23 May 2026

cmpreviewfixer-21.1-1.1.0.jar · 9 KB · for 1.21.1 · NeoForge

Download this release
e384725ebd3a…
Older versions1
  • cmpreviewfixer-21.1-1.0.0.jar20 May 20261.21.18 KB85e53ac781f3…Get

Frequently asked

Does Compact Machines Preview Fixer work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Compact Machines Preview Fixer declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which platform or loader does Compact Machines Preview Fixer support?

NeoForge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Compact Machines Preview Fixer?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

How do I install Compact Machines Preview Fixer?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Compact Machines Preview Fixer safely?

Start with the author's page on CurseForge, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Details from CurseForge, where the author last updated it on 8 Sept 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .