Menu

mod

Just Enough Threads [JEI Startup Optimize]Minecraft mod for 1.21.1

Speeds up JEI startup by moving its heaviest work off the main thread and across CPU cores.

newest supported 1.21.1Mc AddonsPerformance
Latest version
Just Enough Threads 0.5.0 - MC 1.21.1 (neoforge)
Loaders
NeoForge, Forge
Licence
not stated
Downloads
16.9k
Updated
8 d ago
Available on
CurseForge

Minecraft versions

Every version Just Enough Threads [JEI Startup Optimize] declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge, Forge21+declared8 Aug 2024
1.20.1NeoForge, Forge17+declared12 Jun 2023

Download

From Just Enough Threads [JEI Startup Optimize]’s own host. Nothing is re-hosted here.

Just Enough Threads 0.5.0 - MC 1.21.1 (neoforge)release21 Jul 2026

jei_optimize-neoforge-0.5.0+1.21.1.jar · 0.1 MB · for 1.21.1

Download latest
4e4d75d99aa2…
Older versions8
  • Just Enough Threads 0.5.0 - MC 1.20.1 (forge)21 Jul 20261.20.10.1 MB85fb27b004a3…Get
  • Just Enough Threads 0.4.0 - MC 1.21.1 (neoforge)13 Jul 20261.21.10.1 MB21 downloadsca267531e910…Get
  • Just Enough Threads 0.4.0 - MC 1.20.1 (forge)13 Jul 20261.20.10.1 MB2a4998ae1704…Get
  • Just Enough Threads 0.3.0 - MC 1.21.1 (neoforge)12 Jul 20261.21.10.1 MB37 downloads6d4fb50bc290…Get
  • Just Enough Threads 0.3.0 - MC 1.20.1 (forge)12 Jul 20261.20.10.1 MB28 downloads325e94989fd6…Get
  • Just Enough Threads 0.2.0 - MC 1.21.1 (neoforge)11 Jul 20261.21.10.1 MB45 downloadsa8f0353f2afe…Get
  • Just Enough Threads 0.2.0 - MC 1.20.1 (forge)11 Jul 20261.20.10.1 MB2 downloadsfca994e495ca…Get
  • jei_optimize-forge-0.1.0+1.20.1.jar11 Jul 20261.20.10.1 MB2 downloads28dbf0652389…Get

Frequently asked

Does Just Enough Threads [JEI Startup Optimize] work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Just Enough Threads [JEI Startup Optimize] 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 Minecraft versions does Just Enough Threads [JEI Startup Optimize] support?

Everything the author has declared, from 1.20.1 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does Just Enough Threads [JEI Startup Optimize] support?

NeoForge, Forge. 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 Just Enough Threads [JEI Startup Optimize]?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

How do I install Just Enough Threads [JEI Startup Optimize]?

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 Just Enough Threads [JEI Startup Optimize] 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. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

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

Details from CurseForge, where the author last updated it on 20 Sept 2026. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .