Modpack Catalog
OptiFine for Fabric icon

OptiFine for Fabric

Fabric modpack for Minecraft 1.21.4 by iFamished

Get it on Modrinth Full mod list (69)

OptiFine for Fabric runs on Minecraft 1.21.4 with Fabric. It has 68 mods, needs about 6 GB of RAM (our estimate) and runs on both client and server. The latest version is 4, released Sep 19, 2025.

Minecraft version
1.21.4
Mod loader
Fabric
Mods
68
RAM to allocate
6 GB (estimate)
Runs on
Client, server optional
Latest version
4 ()
Downloads
743K (#35)
First released
Pack file size
913 KB
License
GPL 3.0 or later

What is OptiFine for Fabric?

OptiFine for Fabric is a Fabric modpack for Minecraft 1.21.4, published by iFamished on Modrinth since 2025.

The latest release, 4 from Sep 19, 2025, declares 68 mods plus 1 other project such as resource packs or shaders. Across 62 published versions it has covered Minecraft 1.16.5 through 26.3.

With 743K downloads it ranks #35 of the 518 most-downloaded Modrinth modpacks we track, and its authors tag it as lightweight and optimization.

Our notes on OptiFine for Fabric

What sets it apart

Despite the name, this is a bundle of separate mods that copy OptiFine’s features on Fabric. The project page does not say whether any OptiFine files are included, and the mod list contains none under that name.

The list is large for a performance pack, at 69 projects. Sodium, Lithium, Iris and ModernFix handle speed and shaders. Entity Model Features, Entity Texture Features, Continuity, Zoomify, OptiGUI and Polytone cover custom models, textures, connected textures, zoom and custom GUIs. There are also dynamic lighting mods and some loading screen and menu tweaks.

The page advertises large FPS gains over vanilla, but it gives no test methodology, so no figures are repeated here.

Who it suits

Players moving off OptiFine who want resource pack support and the usual features on Fabric in one install.

Before you install

Modrinth lists Fabric builds for Minecraft 1.16.5 through 26.3. The page says its version numbers describe the pack, not Minecraft, and that the plain stable release is the recommended one for most players. Alpha, beta and dev builds are for testing.

The page says version 5 is in alpha testing while version 4 remains supported; the newest build listed on Modrinth, 5-beta.1, is dated November 11, 2026. No RAM recommendation is published.

Lunar Client support is described as in progress. The page links related packs for Quilt and NeoForge.

Playing with friends

Modrinth marks the pack as required on the client and optional on the server. The page does not describe server use or joining servers.

No server pack is documented. The project website at optifineforfabric.com is not summarized here.

Written from public sources, not from hands-on testing. Sources: Modrinth project page, Project website. See our editorial policy.

Most widely used mods in OptiFine for Fabric

The latest version declares 69 projects, 68 of them mods. The ones below appear in the most packs we track.

  • 20 run on client and server
  • 46 client only
  • 2 server only

Full OptiFine for Fabric mod list

How its mod list compares

Less common picks: 5 mods found in five or fewer tracked packs.

Packs with the most mods in common

What kinds of mods are in OptiFine for Fabric?

Of its 68 mods, 38 are tagged utility, 31 optimization and 13 library. Mods can carry several tags, so the counts overlap.

  • utility: 38 (56%)
  • optimization: 31 (46%)
  • library: 13 (19%)
  • decoration: 9 (13%)
  • game mechanics: 4 (6%)
  • cursed: 3 (4%)

How big is OptiFine for Fabric?

With 68 mods, OptiFine for Fabric has more mods than 58% of the 491 packs we track and more mods than 80% of the 15 on Minecraft 1.21.4.

The pack file is 913 KB. 46 mods are client-only and 21 also run on a server. Alongside the mods it declares 1 resource pack.

How actively is OptiFine for Fabric updated?

OptiFine for Fabric was first published on Jan 11, 2025, and has 62 published versions in total.

The latest release, 4, is dated Sep 19, 2025, 418 days before our data was fetched on Nov 11, 2026. Releases have covered 32 Minecraft versions over 251 days.

Staple mods OptiFine for Fabric includes and leaves out

Across the 325 Fabric packs we track, 15 mods turn up most often. OptiFine for Fabric includes 14 of them; it leaves out Architectury API.

How much RAM does OptiFine for Fabric need?

OptiFine for Fabric needs 6 GB allocated (4 GB minimum). Our estimate from the 68-mod list, not measured.

How to set allocated memory

How to install OptiFine for Fabric

Search for "OptiFine for Fabric" in the Modrinth source of your launcher. Pick version 4 for Minecraft 1.21.4 (Fabric). Modpack install guide.

How do I make an OptiFine for Fabric server?

OptiFine for Fabric is marked as supporting a server-side install, so the server must run the same mods and version as the players.

  • Match the version: the latest pack version is 4 for Minecraft 1.21.4.
  • Loader: Fabric.
  • Memory: at least 4 GB (our estimate).

Modpack server guide.

Versions

Newest build for each of 32 Minecraft version and loader pairs, 15 shown.

MinecraftLoaderPack versionReleased
26.3Fabric5-beta.1 (beta)
26.2Fabric4.1-alpha.1 (alpha)
1.21.11Fabric5-alpha.1 (alpha)
26.1.2Fabric4.1-alpha.2 (alpha)
26.1.1Fabric4.1-alpha.1 (alpha)
26.1Fabric4.1-alpha.2 (alpha)
1.21.10Fabric4-alpha.1 (alpha)
1.21.9Fabric4-alpha.1 (alpha)
1.21.6Fabric4-beta.1 (beta)
1.21.4Fabric4
1.21.1Fabric4
1.21.8Fabric3-alpha.1 (alpha)
1.21.7Fabric3-alpha.3 (alpha)
1.21.5Fabric3-alpha.1 (alpha)
1.21.2Fabric1-alpha.1 (alpha)