Let Me Despawn Mod (1.21.8, 1.20.1) – Fix Mob Lag from Persistent Entities

The Let Me Despawn Mod (1.21.8, 1.20.1)—often abbreviated as LMD—is a lightweight utility mod designed to improve server performance by addressing a common source of entity lag: mobs that never despawn due to picking up or equipping items. By restoring natural despawn behavior while preserving valuable loot, this mod ensures smoother gameplay, especially in heavily modded or long-running survival worlds.

Features:

Allow Natural Despawn for Equipped Mobs

In vanilla Minecraft, mobs that pick up items or wear gear become persistent, meaning they’ll never despawn.
LMD overrides this behavior, allowing such mobs to despawn naturally over time.

Item Drop on Despawn

To prevent item loss, LMD makes sure that any equipped or held items are safely dropped when the mob despawns.
This ensures gameplay fairness while maintaining performance gains.

Configurable Mob Exclusion List

You can specify mobs that should retain vanilla persistence using an in-game command or config file.
Useful for custom modded mobs or bosses that you want to keep immune from natural despawn logic.

Server-Side Only

Fully functional as a server-side mod no need for clients to install it.
Perfect for server admins looking to reduce lag without affecting gameplay compatibility.

Dynamic Configuration & Commands

Real-time config editing with no restart required:
- /letmedespawn add <mobName> – Prevents specific mobs from despawning if they pick up items.
- /letmedespawn remove <mobName> – Allows specific mobs to despawn again.
Config file stored at: config/letmedespawn.json
Reload changes using /almanac reload if editing manually.

Why use Let Me Despawn Mod?

In larger modpacks or multiplayer worlds, mobs that pick up items can accumulate rapidly, causing unnecessary memory and tick lag. Let Me Despawn eliminates this issue without altering the gameplay loop items still drop, named mobs stay, and server stability improves dramatically. Whether you’re managing a public server or running a modded single-player world, this mod is a smart addition for performance-conscious Minecraft players.