Clumps Mod (1.21.11, 1.20.6) – Clumps XP Orbs Together to Reduce Lag

Clumps is a performance-enhancing utility mod that groups scattered XP orbs into a single entity to reduce lag in Minecraft, available for Fabric, Forge, and NeoForge mod loaders.

If you have ever killed a large group of mobs or broken down an XP farm only to watch your framerate plummet as dozens of tiny green orbs flood your screen, you already understand the problem Clumps solves. Vanilla Minecraft treats every single experience orb as its own entity, each with collision checks, rendering calls, and physics calculations. In high-output XP farms or mob grinders, this can cause noticeable lag spikes — especially on servers with multiple players. With over 24 million downloads on Modrinth, Clumps has become one of the most widely adopted quality-of-life mods in the Minecraft ecosystem, trusted by solo players and server administrators alike. Created by jaredlll08 — the same developer behind CraftTweaker — this mod has been actively maintained since its original release and continues to receive prompt updates for the latest Minecraft versions.

Key Features of Clumps

• XP Orb Merging — Instead of letting every individual orb exist as a separate entity, Clumps combines nearby XP orbs into one single orb that holds the combined experience value. This dramatically cuts down on the number of entities your client and server have to process, which translates directly into smoother gameplay around XP farms and mob grinders.
• Instant XP Collection — In vanilla Minecraft, orbs linger around the player for several seconds after contact, cluttering the screen and continuing to consume resources. Clumps makes orbs get absorbed the moment they touch the player, so you receive your experience immediately and move on without the annoying visual clutter hovering in your face.
• Server-Side Only (1.17+) — For Minecraft 1.17 and newer, Clumps only needs to be installed on the server. This is a huge advantage for server operators because players do not need to download or configure anything on their end. The lag reduction happens transparently for everyone connected to the server.
• Zero Configuration Required — There are no config files to tweak, no settings menus to navigate, and no options to adjust. You install Clumps and it works immediately. This makes it an ideal "set and forget" mod that belongs in every modpack's utility layer.
• Multi-Loader Support — Clumps is available for Fabric, Forge, and NeoForge, covering all three major modding platforms. Whether you run a lightweight Fabric server or a feature-heavy Forge modpack, you can take advantage of the same XP optimization without switching your mod loader.
• Lightweight Footprint — The mod appears to be extremely lightweight, focusing on a single well-defined task. It does not bundle unnecessary features or bloat your mod list. This focused design philosophy means it plays well with other performance mods and rarely causes compatibility conflicts.
• Open Source (MIT License) — Clumps is released under the permissive MIT license with its full source code available on GitHub. Modpack creators can freely include it, and the community can audit the code to verify exactly what the mod does — nothing more, nothing less.

How to Install Clumps

1. First, install your preferred mod loader. Clumps supports Fabric, Minecraft Forge, or NeoForge. Download and run the installer for the Minecraft version you want to play.
2. If you are using Fabric, you will also need Fabric API installed in your mods folder, as most Fabric mods depend on it.
3. Download the correct Clumps file for your Minecraft version and mod loader from the download section below. Make sure the version numbers match exactly.
4. Place the downloaded .jar file into your .minecraft/mods/ folder. If the folder does not exist, launch Minecraft once with your mod loader profile selected to generate it automatically.
5. Launch Minecraft using your mod loader profile. Clumps will activate automatically — no additional configuration is needed. For servers running 1.17+, only the server needs the mod installed.

Requirements & Compatibility

What's New

• Ported to Minecraft 26.1 with full Fabric and NeoForge support
• Added support for Minecraft 1.21.11 across NeoForge, Forge, and Fabric
• Updated compatibility for Minecraft 1.21.9 and 1.21.10, addressing community-reported issues
• Ported to Minecraft 1.21.7 and 1.21.8 with continued multi-loader support
• Fixed Forge support in recent builds to resolve loader-specific bugs

Pros and Cons

Alternatives to Clumps

• Lithium — A general-purpose server optimization mod that improves tick times across many game systems, complementing Clumps by addressing lag sources beyond XP orbs.
• Sodium — A client-side rendering optimization mod that boosts FPS significantly; pairs well with Clumps since Sodium handles the visual side while Clumps tackles entity overhead.
• Entity Culling — Prevents rendering of entities that are not visible to the player, offering another layer of performance improvement that stacks nicely alongside Clumps.

Download Clumps

Always download mods from official sources to stay safe.

Frequently Asked Questions

Is Clumps client-side or server-side?

For Minecraft 1.17 and newer, Clumps is server-side only — players do not need to install it on their client. For older Minecraft versions (pre-1.17), you need to install it on both the client and the server for it to function properly.

Does Clumps work with Fabric, Forge, and NeoForge?

Yes — Clumps supports all three major mod loaders. Each Minecraft version has separate downloads for Fabric, Forge, and NeoForge, so make sure you grab the correct file that matches your loader and game version.

Can I use Clumps alongside other performance mods like Sodium or Lithium?

Yes, Clumps is fully compatible with other popular performance mods. Since it focuses specifically on XP orb optimization, it does not overlap with mods like Sodium (rendering) or Lithium (server tick optimization). Using them together provides the best overall performance improvement.

Does Clumps change how much XP I receive?

No — Clumps does not alter XP values in any way. It only merges the visual orb entities into one combined orb that holds the exact same total experience. You receive the same amount of XP as you would in vanilla Minecraft; the difference is purely in how the orbs are grouped and collected.

Do I need to configure anything after installing Clumps?

No configuration is needed. Clumps works immediately after installation with no settings files or in-game menus to adjust. Simply drop the mod file into your mods folder, and XP orbs will automatically be grouped and collected instantly on contact.

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