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Optimization and FPS Build for Minecraft 1.21.1

A modpack for maximum Minecraft performance: smooth FPS and minimal lag.

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Updated
Updated 05.10.2026

About the Optimization and FPS modpack

The modpack is aimed at increasing FPS and reducing system load. All mods work without changing gameplay.

What's inside:

  • ImmediatelyFast — speeds up rendering, increases FPS
  • Dynamic FPS — reduces load in the background
  • Krypton — speeds up network code
  • FPS Reducer — reduces load when idle
  • Particle Culling — disables unnecessary particles

How to install Optimization and FPS

  1. Install Millida Launcher

    The launcher is free: download it at millida.net/launcher and sign in with any nickname.

  2. Click “Install” on this page

    The launcher opens and installs the modpack for Minecraft 1.21.1 on Fabric automatically.

  3. Launch the game

    A profile with it appears in the launcher: click “Play”.

Minecraft 1.21.1 runs on Java 21: with a different Java version the game may close right after launch.

Versions

With dependencies

MinecraftLoaderFileActions
1.21.1Fabric1

FAQ

Which Minecraft versions does Optimization and FPS work on?

Only Minecraft 1.21.1: there are no files for other versions.

Is Optimization and FPS for Forge or Fabric?

Only for Fabric: 1.21.1.

Which Java does Optimization and FPS need?

Minecraft 1.21.1 runs on Java 21. If the game closes right after launch, the usual cause is the wrong Java version in the profile settings.

How do I download Optimization and FPS?

With Millida Launcher: it installs Optimization and FPS into a modpack by itself, for the right game version and loader. The launcher is free.

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