Mods for 1.21.3
149 mods match your filters.
Improves performance by tweaking mob despawn rules. Say bye to pesky unintentional persistent mobs.
A mod that aims to optimize the minecraft server.
Performance improvements for vanilla AI, with the ability to turn off certain AI behaviors
Quick leaf decay from cutting down trees. Built for fast performance and mod compat!
An efficient and non-locational redstone dust implementation
Speed up your world loading by removing unneeded chunks.
Vanilla Worldgen optimization mod
A modpack utility mod that allows to disable spawning of any entity.
This mod fixes a bunch of crash exploits discovered in Minecraft.
Fixes incorrect snow generation on tree leaves MC-119599
Adds tags and configuration options for defining how dropped items should combine.
Async improves entity performance by processing entities in parallel across multiple CPU cores and threads.
Allows players to decorate their enchanting table setup by fixing the "enchantment power transmitter" block tag.
TT20 helps reduce lag by optimizing how ticks work when the server's TPS is low.
A simple mod that makes powered/activator rails turn on/off up to 20x faster.
Works around the MC-271325 bug on Fabric and NeoForge servers (fixes "error sending packet clientbound/minecraft:disconnect")
Simulates blocks and entities to catch up after being unloaded for a period of time.
Fix custom world generation datapack crashes when using minecraft:lake feature ( MC-273228 and MC-272370)
A lightweight server side mod that stops dolphins drowning when unable to move
Parrots have been 'trained' to remain perched on your shoulders!
A performance-focused fork of Noisium that accelerates Minecraft's terrain generation through targeted optimizations. Generates chunks faster without altering world output.
Prevents player from spamming excessive recipe book packets to lag out the server
Optimizes Minecraft mob AI by scaling calculations based on distance to players, improving performance with as minimal gameplay impact as possible
Instantly collect items from mined blocks directly into your inventory with the AutoPickup mod. Mob loot & more configurable!