modpack
OptimumFuseMinecraft modpack for 1.21.5
[1.21.5] [Fabric📜] An open-source modpack that improves the game's performance and visuals, inspired by OptiFine, while staying true to the vanilla Minecraft experience.
- Latest version
- 1.16.0+fabric.1.21.1
- Minecraft
- 1.16.5 to 1.21.5
- Java
- Java 21+
- Loaders
- Fabric, Quilt, NeoForge, Forge
- Licence
- Apache-2.0
- Downloads
- 40.5k
- Updated
- 12 mo ago
- Available on
- Modrinth
Screenshots
Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.
Minecraft versions
Every version OptimumFuse declares support for, newest first, with the Java runtime that version needs.
| Minecraft | Through | Java | Evidence | Released |
|---|---|---|---|---|
| 1.21.5 | Fabric, Quilt, NeoForge, Forge | 21+ | declared | 25 Mar 2025 |
| 1.21.4 | Forge, Quilt, NeoForge, Fabric | 21+ | declared | 3 Dec 2024 |
| 1.21.3 | Forge, Quilt, NeoForge, Fabric | 21+ | declared | 23 Oct 2024 |
| 1.21.1 | Forge, Quilt, NeoForge, Fabric | 21+ | declared | 8 Aug 2024 |
| 1.21 | Forge, Quilt, NeoForge, Fabric | 21+ | declared | 13 Jun 2024 |
| 1.20.6 | Fabric, Forge, NeoForge, Quilt | 21+ | declared | 29 Apr 2024 |
| 1.20.6-rc1 | Fabric, Quilt, NeoForge, Forge | 21+ | declared | 26 Apr 2024 |
| 1.20.5 | Forge, Quilt, NeoForge, Fabric | 21+ | declared | 23 Apr 2024 |
| 1.20.4 | Fabric, Quilt, NeoForge, Forge | 17+ | declared | 7 Dec 2023 |
| 1.20.2 | Fabric, Quilt, NeoForge, Forge | 17+ | declared | 20 Sept 2023 |
| 1.20.1 | Forge, Quilt, NeoForge, Fabric | 17+ | declared | 12 Jun 2023 |
| 1.16.5 | Quilt, Forge, NeoForge, Fabric | 8+ | declared | 14 Jan 2021 |
For Minecraft 1.21.5
Choose the loader you use before downloading.
- Get Fabric
Fabric
1.15.0-beta.3+fabric.1.21.5 · 13 Jun 2025 · OptimumFuse 1.15.0-beta.3+fabric.1.21.5.mrpack
Most recently published release
OptimumFuse 1.16.0+fabric.1.21.1.mrpack · 0.4 MB · for 1.21.1 · Fabric
ec3e68846d2f…Older versions24Hide older versions
- 1.15.0-beta.3+fabric.1.21.513 Jun 20251.21.50.8 MB1.2k downloads
d83087df3d22…Get - 1.15.0-beta.2+fabric.1.21.524 May 20251.21.50.8 MB310 downloads
ab3d44c9e5c0…Get - 1.15.0-beta.1+fabric.1.21.515 May 20251.21.50.8 MB180 downloads
938fe7e66428…Get - 1.14.6+fabric.1.21.47 May 20251.21.40.4 MB462 downloads
1ac5677693a1…Get - 1.14.5+fabric.1.21.410 Apr 20251.21.40.4 MB381 downloads
11ef8306fd3c…Get - 1.14.4+fabric.1.21.41 Apr 20251.21.40.4 MB195 downloads
1b9b4ad9f14e…Get - 1.14.3+fabric.1.21.431 Mar 20251.21.40.4 MB56 downloads
da59b57e81cb…Get - 1.14.2+fabric.1.21.421 Mar 20251.21.40.4 MB173 downloads
1fc00538e23e…Get - 1.14.1+fabric.1.21.410 Mar 20251.21.40.4 MB226 downloads
c63ea699e4ca…Get - 1.14.0+fabric.1.21.41 Mar 20251.21.40.4 MB223 downloads
b28efb087c70…Get - 1.14.0-beta.13+fabric.1.21.413 Feb 20251.21.40.4 MB319 downloads
908a7f52e728…Get - 1.14.0-beta.12+fabric.1.21.410 Feb 20251.21.40.5 MB75 downloads
cce17e86e198…Get - 1.14.0-beta.11+fabric.1.21.44 Feb 20251.21.40.4 MB124 downloads
d0d8e3a357a3…Get - 1.14.0-beta.10+fabric.1.21.430 Jan 20251.21.40.3 MB118 downloads
0bcc7b66d901…Get - 1.14.0-beta.9+fabric.1.21.424 Jan 20251.21.40.5 MB116 downloads
b258ed74520e…Get - 1.14.0-beta.8+fabric.1.21.418 Jan 20251.21.40.5 MB111 downloads
b65f6c9d73a3…Get - 1.14.0-beta.7+fabric.1.21.415 Jan 20251.21.40.5 MB98 downloads
4d02b5f83c82…Get - 1.14.0-beta.6+fabric.1.21.412 Jan 20251.21.40.6 MB85 downloads
4254ba4d8194…Get - 1.14.0-beta.5+fabric.1.21.328 Dec 20241.21.30.8 MB262 downloads
8bcdcbf62ada…Get - 1.14.0-beta.4+fabric.1.21.323 Dec 20241.21.30.8 MB89 downloads
01747461ba5f…Get - 1.14.0-beta.3+fabric.1.21.319 Dec 20241.21.30.7 MB95 downloads
3257f20308c9…Get - 1.14.0-beta.2+fabric.1.21.316 Dec 20241.21.30.7 MB67 downloads
ee2c1b82a617…Get - 1.14.0-beta.1+fabric.1.21.310 Dec 20241.21.30.7 MB91 downloads
ab5b2837f0d9…Get - 1.13.5+fabric.1.21.130 Nov 20241.21.10.1 MB539 downloads
b047569ca407…Get
Frequently asked
Does OptimumFuse work on Minecraft 1.21.5?
Yes. 1.21.5 is the newest Minecraft version OptimumFuse 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 OptimumFuse support?
Everything the author has declared, from 1.16.5 up to 1.21.5. The full list is in the table above, with the Java runtime each version needs next to it.
Do I need to install OptimumFuse 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 platform or loader does OptimumFuse support?
Fabric, Quilt, 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 OptimumFuse?
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.
What licence is OptimumFuse 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 OptimumFuse?
Use a launcher that imports packs, such as Prism Launcher, the Modrinth App or the CurseForge app, and open the pack file with it. The launcher installs the right loader and mods for you; installing a pack's mods by hand is the error-prone way.
Where do I download OptimumFuse 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. 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.
Is this information wrong or missing something? .