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FleroviumMinecraft mod for 1.21.1

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

newest supported release 1.21.1Utility QolPerformance
Latest version
flerovium-neoforge-1.21.1-1.2.0-all.jar
Minecraft
1.20.1 to 1.21.1
Java
Java 21+
Loaders
NeoForge, Forge
Licence
not stated
Downloads
24.8M
Updated
1 mo ago
Available on
CurseForge

Minecraft versions

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

Browse 42 indexed releases

Most recently published release

flerovium-neoforge-1.21.1-1.2.0-all.jaralpha26 Sept 2026

flerovium-neoforge-1.21.1-1.2.0-all.jar · 0.2 MB · for 1.21.1 · NeoForge

Download this release
09917774048a…
Older versions24
  • flerovium-neoforge-1.21.1-1.1.3-all.jar12 Sept 20261.21.10.2 MBe055a4755b4c…Get
  • flerovium-neoforge-1.21.1-1.1.2-all.jar14 Jul 20261.21.10.2 MB1.5k downloads31491e08947d…Get
  • flerovium-forge-1.20.1-1.2.19-all.jar20 Jun 20261.20.10.2 MB4.4k downloads6f1536b97ce6…Get
  • flerovium-neoforge-1.21.1-1.1.1-all.jar19 Jun 20261.21.10.2 MB1.3k downloadsb5910a14b473…Get
  • flerovium-neoforge-1.21.1-1.1.0-all.jar9 Jun 20261.21.10.2 MBcfa7fb59a1c3…Get
  • flerovium-neoforge-1.21.1-1.0.18-all.jar19 Apr 20261.21.10.2 MB3d7890fa10d7…Get
  • flerovium-forge-1.20.1-1.2.18-all.jar6 Feb 20261.20.10.2 MB1.9M downloads319af234013d…Get
  • flerovium-forge-1.20.1-1.2.17-all.jar26 Jan 20261.20.10.2 MB1805429d1a89…Get
  • flerovium-neoforge-1.21.1-1.0.17-all.jar21 Dec 20251.21.10.2 MB3.0k downloads57dee660ac01…Get
  • flerovium-neoforge-1.21.1-1.0.16-all.jar17 Dec 20251.21.10.2 MB1 download9791d2bfc4b1…Get
  • flerovium-forge-1.20.1-1.2.16-all.jar5 Oct 20251.20.10.2 MB2.8M downloads12dd81bea1dc…Get
  • flerovium-neoforge-1.21.1-1.0.15-all.jar5 Oct 20251.21.10.2 MBc5cc57c436ff…Get
  • flerovium-neoforge-1.21.1-1.0.14-all.jar17 Sept 20251.21.10.2 MBdeec782fc0e6…Get
  • flerovium-neoforge-1.21.1-1.0.13-all.jar16 Sept 20251.21.10.2 MB106 downloads1fcc3c5517b8…Get
  • flerovium-neoforge-1.21.1-1.0.12-all.jar6 Sept 20251.21.10.2 MB1 download2454d791ad1b…Get
  • flerovium-neoforge-1.21.1-1.0.11-all.jar2 Sept 20251.21.10.2 MB3206d02cf94b…Get
  • flerovium-neoforge-1.21.1-1.0.10-all.jar28 Jul 20251.21.10.1 MB178d8cbcad8c…Get
  • flerovium-neoforge-1.21.1-1.0.9-all.jar26 Jul 20251.21.10.1 MB22df16adad5b…Get
  • flerovium-neoforge-1.21.1-1.0.7-all.jar20 Jul 20251.21.10.1 MBbf6dcbbe3c3e…Get
  • flerovium-forge-1.20.1-1.2.15-all.jar20 Jul 20251.20.10.2 MB1.1M downloadsbdddd8b5b32c…Get
  • flerovium-forge-1.20.1-1.2.14-all.jar29 May 20251.20.10.2 MB475.7k downloads4a6559c66e23…Get
  • flerovium-neoforge-1.21.1-1.0.6-all.jar19 May 20251.21.10.1 MB18223980e1fc…Get
  • flerovium-forge-1.20.1-1.2.13-all.jar13 May 20251.20.10.2 MB32.0k downloads9529a1e35e23…Get
  • flerovium-neoforge-1.21.1-1.0.5-all.jar12 May 20251.21.10.1 MB906 downloadsb02ac1d4d526…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.

Which platform or loader does Flerovium 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 Flerovium?

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 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?

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.

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.

Details from CurseForge, where the author last updated it on 26 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? .