Let Me Despawn Mod (1.21.11, 1.20.6) – FPS Optimization

Let Me Despawn is a performance optimization mod that fixes entity lag caused by persistent mobs in Minecraft, available for Fabric, Forge, NeoForge, and Quilt mod loaders.

Here is a frustrating scenario every Minecraft player knows: your world gets older, mob counts climb, and your TPS starts tanking. The culprit is often not your hardware or your render distance — it is zombies wearing helmets they picked up off the ground. In vanilla Minecraft, any mob that picks up or equips an item becomes permanently persistent. It will never despawn. Over time, these "accidental" persistent mobs pile up and choke your server's entity processing. Let Me Despawn, developed by frikinjay, directly targets this problem by allowing equipped mobs to despawn naturally like any other hostile mob. With over 16 million downloads since its 2022 release, it has become one of the most trusted optimization mods in the Minecraft community — and for good reason.

Key Features of Let Me Despawn

• Equipped mobs can despawn naturally — In vanilla Minecraft, a zombie that picks up a single piece of rotten armor becomes permanent, never despawning even when no players are nearby. Let Me Despawn overrides this behavior so those mobs follow normal despawn rules. This single change can dramatically reduce entity counts in long-running worlds and busy servers.
• Dropped items are preserved on despawn — When an equipped mob despawns, it drops whatever items it was carrying before disappearing. This means you never lose valuable loot to the despawn system. If a skeleton picked up your enchanted sword, that sword still hits the ground when the skeleton despawns.
• Configurable mob exclusion list — Not every mob should be affected by the modified despawn rules. Let Me Despawn provides a JSON config file and in-game commands to whitelist specific mobs that should retain their vanilla persistent behavior. This gives server admins precise control over which entities stay and which can leave.
• In-game commands for real-time control — Server operators can use /letmedespawn add and /letmedespawn remove commands to modify the exclusion list without restarting the server or manually editing config files. Changes apply immediately, making it simple to fine-tune behavior on a running server.
• Server-side only — no client install needed — Let Me Despawn runs entirely on the server side. Players connecting to your server do not need to install anything. This makes deployment on multiplayer servers effortless and removes the usual friction of requiring all players to match their mod setup.
• Named mobs are protected — Mobs that have been given a name tag still follow vanilla rules and will not despawn. This ensures that player-named pets, villagers, or custom NPCs remain safe, keeping the mod's behavior predictable and non-destructive to intentional game setups.
• Broad mod loader and version support — Let Me Despawn is available for Fabric, Forge, NeoForge, and Quilt, spanning Minecraft versions from 1.20.5 all the way through the latest 1.21.11 pre-releases. Whether you run a vanilla-adjacent Fabric server or a heavy NeoForge modpack, this mod fits right in.

Screenshots

How to Install Let Me Despawn

1. Install your preferred mod loader on your server or singleplayer instance. Let Me Despawn supports Fabric, Forge, NeoForge, and Quilt.
2. Download the correct version of Let Me Despawn for your Minecraft version and mod loader from the download section below.
3. Place the downloaded .jar file into the mods folder of your server or game directory.
4. If you are using the Fabric or Quilt version, also install the Almanac library mod, which is a required dependency for configuration support.
5. Start your server or game. The mod will generate its config file at config/letmedespawn.json automatically. No client-side installation is needed for players connecting to a server.

Requirements & Compatibility

What's New

• Items no longer store additional data when processed by the mod, resulting in cleaner item handling.
• Continued compatibility updates for the latest Minecraft 1.21.11 pre-release snapshots.
• Ongoing support across Fabric, NeoForge, and Quilt loaders.

Pros and Cons

Alternatives to Let Me Despawn

• Lithium — A general-purpose server optimization mod for Fabric that improves tick performance across many game systems, including entity processing. Pairs well with Let Me Despawn for maximum server performance.
• FerriteCore — Reduces memory usage in Minecraft, which complements Let Me Despawn's entity count reduction by tackling a different side of the performance equation.
• ServerCore — A comprehensive server optimization mod that includes entity limits and spawn tweaks, offering a broader but less targeted approach compared to Let Me Despawn's focused despawn fix.

Download Let Me Despawn

Always download mods from official sources to stay safe.

Frequently Asked Questions

Is Let Me Despawn safe to add to an existing world?

Yes — Let Me Despawn can be safely added to any existing world or server without data loss. The mod only changes how the game evaluates despawn checks for mobs with equipped items. It does not modify world data, chunk storage, or existing entity NBT in a destructive way. You can also remove it at any time without breaking your save.

Do I need to install Let Me Despawn on the client?

No — Let Me Despawn is entirely server-side. Players connecting to a server running this mod do not need to install it on their client. This makes it particularly convenient for multiplayer servers where requiring client-side mods creates additional setup burden for players.

Will named mobs still be protected from despawning?

Yes — mobs given a name tag will retain their vanilla behavior and will not despawn naturally, even with Let Me Despawn installed. The mod specifically preserves this mechanic so that pets, custom NPCs, and any intentionally named entities remain safe in your world.

Does Let Me Despawn work with modded mobs from other mods?

Yes — the mod applies its despawn logic to all mob entities, including those added by other mods. If a modded mob picks up items and becomes persistent, Let Me Despawn will allow it to despawn naturally. You can also use the exclusion list to protect specific modded mobs if they should remain persistent.

Can I use Let Me Despawn alongside other optimization mods like Lithium?

Yes — Let Me Despawn is designed to be compatible with other optimization mods. Since it targets a very specific mechanic (mob despawn checks for equipped entities), it does not overlap with general optimization mods like Lithium, FerriteCore, or Sodium. Many server operators run all of these together for the best possible performance.

You May Also Like

Client Tweaks Mod (1.21.11, 1.20.1) – Bug Fixes & Patches

5 days ago

[Let's Do] Bakery (1.21.1, 1.20.1)

2 days ago

Morph Mod (1.16.5, 1.12.2) – Morph Into Any Mob

3 weeks ago

Nexus Layer Mod (1.20.1) – Library for BrikNex's Mods

1 week ago

Polymer Mod (1.21.11, 1.20.1) – Server-side Content Library

1 week ago

Entity Culling Mod (1.21.11, 1.20.6) – Increase Your FPS

2 weeks ago