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FleroviumMinecraft mod for 1.21.1

Greatly improve your fps with virtually no side-effects on graphics quality

client onlynewest supported 1.21.1Optimization
Latest version
1.1.2
Minecraft
1.20.1 to 1.21.1
Java
Java 21+
Loaders
Forge, NeoForge
Licence
LGPL-3.0-only
Downloads
4.6M
Updated
2 d ago
Available on
Modrinth

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Forge, NeoForge21+declared8 Aug 2024
1.20.1Forge, NeoForge17+declared12 Jun 2023

Download

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

All 33 releases
1.1.2release14 Jul 2026

flerovium-neoforge-1.21.1-1.1.2-all.jar · 0.2 MB · for 1.21.1

Download latest
6301ea699176…
Older versions24
  • 1.2.1920 Jun 20261.20.10.2 MB281.8k downloadsa137aed55fc3…Get
  • 1.1.120 Jun 20261.21.10.2 MB32.7k downloads327449811b11…Get
  • 1.1.016 Jun 20261.21.10.2 MB4.3k downloadsaca9cedc692c…Get
  • 1.0.1819 Apr 20261.21.10.2 MB456.1k downloadsee04af8b6786…Get
  • 1.2.186 Feb 20261.20.10.2 MB754.7k downloadsfeabbd89712a…Get
  • 1.2.1726 Jan 20261.20.10.2 MB29.6k downloads54872413f951…Get
  • 1.0.1721 Dec 20251.21.10.2 MB121.1k downloadsa6c7a79bc2cd…Get
  • 1.0.1617 Dec 20251.21.10.2 MB4.0k downloads0af305aee874…Get
  • 1.2.165 Oct 20251.20.10.2 MB821.8k downloadsf1807d021724…Get
  • 1.0.155 Oct 20251.21.10.2 MB63.4k downloadsd6911552ac08…Get
  • 1.0.1417 Sept 20251.21.10.2 MB24.2k downloadsf11f2a560ca1…Get
  • 1.0.1316 Sept 20251.21.10.2 MB261 downloadse38b2d59efc4…Get
  • 1.0.126 Sept 20251.21.10.2 MB6.9k downloadsf23be8d849d9…Get
  • 1.0.112 Sept 20251.21.10.2 MB3.1k downloads644ae6b49dad…Get
  • 1.0.1028 Jul 20251.21.10.1 MB39.5k downloadseee3195e1bad…Get
  • 1.0.926 Jul 20251.21.10.1 MB2.4k downloads5a7e16f2df12…Get
  • 1.0.720 Jul 20251.21.10.1 MB5.0k downloads89ef3e85520a…Get
  • 1.2.1520 Jul 20251.20.10.2 MB408.4k downloadsdd464cc3c16d…Get
  • 1.2.1429 May 20251.20.10.2 MB222.9k downloadsb209dc5500bf…Get
  • 1.0.619 May 20251.21.10.1 MB44.4k downloadsbf6d68f5e22c…Get
  • 1.2.1313 May 20251.20.10.2 MB45.7k downloadsbb101a2c55b5…Get
  • 1.0.512 May 20251.21.10.1 MB3.0k downloadsb21e294157ba…Get
  • 1.2.1212 May 20251.20.10.2 MB816 downloads8cd7b1912c97…Get
  • 1.2.1110 May 20251.20.10.2 MB1.3k downloads5b71e7985765…Get

Frequently asked

Does Flerovium work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Flerovium 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 Flerovium 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.

Do I need to install Flerovium on the client or the server?

The client only. There is nothing to install on the server side. That is the author's declared design, not a guarantee for every server: one running anti-cheat or missing a counterpart mod can still object.

Which loader does Flerovium need?

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

Which Java version do I need for Flerovium?

On the newest Minecraft release 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.

What licence is Flerovium under?

LGPL-3.0-only, 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 Flerovium?

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 Flerovium safely?

From the author's own page on Modrinth, which is where the data here is synced from. MCReference never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

Works on the same versions

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

BookshelfAn open source library for other mods!GeckoLibA 3D animation library for entities, blocks, items, armor, and more!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.

Last checked 2 d 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? .