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Master OptimizerMinecraft plugin for 1.21.9

A professional-level Minecraft server optimization plugin that manages RAM, entities, chunks, and plugins. It is Designed for 1.18.x to 1.21.x. Ideal for low-memory and budget-hosted servers.

server onlynewest supported 1.21.9Optimization
Latest version
1.5.0
Minecraft
1.17.1 to 1.21.9
Java
Java 21+
Platforms
Folia, Spigot, Purpur, Paper
Licence
Apache-2.0
Downloads
3.0k
Updated
12 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Master Optimizer servers

One click and Master Optimizer is installed on a Paper or Purpur server built for it.

  • 1.21.9
  • Folia
  • Spigot
  • Purpur
  • Paper
  • One click plugin install
  • Paper and Purpur ready
  • Automatic updates
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version Master Optimizer declares support for, newest first, with the Java runtime that version needs.

Other plugins
MinecraftThroughJavaEvidenceReleased
1.21.9Folia, Spigot, Purpur, Paper21+declared30 Sept 2025
1.21.8Paper, Spigot, Purpur, Folia21+declared17 Jul 2025
1.21.7Paper, Spigot, Purpur, Folia21+declared30 Jun 2025
1.21.6Paper, Spigot, Purpur, Folia21+declared17 Jun 2025
1.21.5Paper, Spigot, Purpur, Folia21+declared25 Mar 2025
1.21.4Folia, Spigot, Purpur, Paper21+declared3 Dec 2024
1.21.3Folia, Spigot, Purpur, Paper21+declared23 Oct 2024
1.21.2Paper, Spigot, Purpur, Folia21+declared22 Oct 2024
1.21.1Paper, Spigot, Purpur, Folia21+declared8 Aug 2024
1.21Paper, Spigot, Purpur, Folia21+declared13 Jun 2024
1.20.6Paper, Spigot, Purpur, Folia21+declared29 Apr 2024
1.20.5Paper, Spigot, Purpur, Folia21+declared23 Apr 2024
1.20.4Folia, Paper, Purpur, Spigot17+declared7 Dec 2023
1.20.3Folia, Spigot, Purpur, Paper17+declared4 Dec 2023
1.20.2Paper, Spigot, Purpur, Folia17+declared20 Sept 2023
1.20.1Paper, Spigot, Purpur, Folia17+declared12 Jun 2023
1.20Paper, Spigot, Purpur, Folia17+declared2 Jun 2023
1.19.4Paper, Spigot, Purpur, Folia17+declared14 Mar 2023
1.19.3Paper, Spigot, Purpur, Folia17+declared7 Dec 2022
1.19.2Purpur, Spigot, Paper, Folia17+declared5 Aug 2022
1.19.1Folia, Spigot, Purpur, Paper17+declared27 Jul 2022
1.19Paper, Spigot, Purpur, Folia17+declared7 Jun 2022
1.18.2Paper, Spigot, Purpur, Folia17+declared28 Feb 2022
1.18.1Paper, Spigot, Purpur, Folia17+declared10 Dec 2021
1.18Paper, Spigot, Purpur, Folia17+declared30 Nov 2021
1.17.1Purpur, Paper, Folia, Spigot16+declared6 Jul 2021

Download

From Master Optimizer’s own host. Nothing is re-hosted here.

1.5.0release1 Oct 2025

MasterOptimizer-1.5.0.jar · 1.7 MB · for 1.21.9, 1.21.8, 1.21.7, 1.21.6, 1.21.5 +21 more

Download latest
11c784c99d1b…
Older versions4
  • 1.4.031 Aug 20251.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4 +19 more33 KB275 downloadsdd363594b095…Get
  • 1.3.08 Aug 20251.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4 +19 more12 KB197 downloadsd5d0ae311e14…Get
  • 1.2.027 Jul 20251.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4 +19 more10 KB104 downloadse47356211a10…Get
  • 1.1.020 Jul 20251.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4 +19 more7 KB51 downloads8f437c305507…Get

Frequently asked

Does Master Optimizer work on Minecraft 1.21.9?

Yes. 1.21.9 is the newest Minecraft version Master Optimizer 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 Master Optimizer support?

Everything the author has declared, from 1.17.1 up to 1.21.9. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Master Optimizer on the client or the server?

The server only. Players join with an ordinary Minecraft client and install nothing.

Which platform or loader does Master Optimizer support?

Folia, Spigot, Purpur, Paper. 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 Master Optimizer?

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

What licence is Master Optimizer under?

Apache-2.0, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Master Optimizer?

Choose the release variant for your server platform. Paper, Spigot, Purpur and Bukkit files go in the server's plugins folder; Fabric, Forge, NeoForge and Quilt files go in the mods folder. Restart after installing and check that the Minecraft version matches your server.

Where do I download Master Optimizer safely?

Start with the author's page on Modrinth, 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.

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Last checked 2 mo ago against Modrinth. 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? .