CurseForge · Minecraft mod
Performance Tweaks
Several optimizations and bugfixes. Entity Collision FPS fix, Let-Me-Despawn, railway optimization and alternate current.
Quick answer
Which Performance Tweaks release should I use?
Performance Tweaks perf_tweaks-fabric-1.21.1-1.3.0 targets 1.21, 1.21.1 with Fabric. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is Performance Tweaks required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Performance Tweaks perf_tweaks-fabric-1.21.1-1.3.0 need?
perf_tweaks-fabric-1.21.1-1.3.0. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Performance Tweaks without breaking your instance.
Built for Performance Tweaks perf_tweaks-fabric-1.21.1-1.3.0. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use perf_tweaks-fabric-1.21.1-1.3.0. It targets 1.21, 1.21.1 with Fabric; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside perf_tweaks-fabric-1.21.1-1.3.0. It opens that exact file at the source.
About this project
What does Performance Tweaks add?
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About
Performance tweaks is a mod that contains several optimizations and fixes, ranging from entity optimizations to redstone. Post your thoughts in the comments, for new optimizations you would like to see!
From now on, I am bundling performance tweaks as a multi-platform mod, available for many Minecraft versions. Every optimization will be included, but there will be config options to disable some of them if you don't want them.
Config: (1.2.0+) All config files are now under config/perf-tweaks folder
Dependencies: Because this mod is now multi-platform, Architectury API is now a required dependency
This mod can just be installed on client and server, but works best when installed on both.
New Discord Server!
Join the server for announcements, bug reports, beta releases and more!
Check out the wiki!
The wiki contains all information and help with this mod
Optimizations
Many of these optimizations are no longer updated to modern Minecraft versions, or have additional functionality / configure-ability.
Client Side Optimizations
- Optimization to skip collision checks with many client side entities. (These checks are already handled by the server, reducing the strain on your client.)
- Forked from Corgi_Taco's Entity Collision FPS Fix (Curseforge), (Github)
- Super lightweight, so it should be compatible all mods.
Server Side Optimizations
Optimization to allow mobs with equipped items to despawn naturally. Preserves dropped items when mobs despawn (Configurable)
- Forked from frikinjay's Let Me Despawn mod (Curseforge), (Github). Contains additional configuration options not present in the original mod
- Lightweight tweak that should boost server performance if your world has lots of various entities.
- Configurable mob exclusion list. To make a mob "persistent" just enter
perf_tweaks persistence <mob-name> - If you don't want this optimization, Set
"despawning.enable_despawning_optimization": falsein theperf_tweaks.jsonin the configs.
Optimizations to reduce block updates and power calculations made to Redstone. (Configurable)
- Forked from AC. Credit to SpaceWalkerRS for this fantastic mod: (Curseforge), (GitHub)
- Designed to be minimally invasive to existing Minecraft code, so it shouldn't have any compatibility issues except maybe with mods that significantly alter Redstone.
- If you don't want this optimization, Set
"enable_alternate_current_by_default": falsein theperf_tweaks.jsonin the configs. Additionally, you can disable alternate current for any world by typing commandalternatecurrent off
Optimizations to speed up performance with powered rails. Replaces wasteful recursive method calling with a much faster check by a single powered rail.
- Forked from the mod by FX_PR0CESS: (Curseforge), (Github). The original mod is no longer being updated.
- This mod comprises 1 mixin, so there should be no compatibility issues
Project description from CurseForge.
Pick your setup
Performance Tweaks by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.1
3 loader builds1.21
3 loader builds1.20.1
3 loader builds1.20
3 loader buildsCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Performance Tweaks versions and loaders
perf_tweaks-fabric-1.21.1-1.3.0
perf_tweaks-fabric-1.21.1-1.3.0.jar
16 Jun 2026
perf_tweaks-neoforge-1.21.1-1.3.0
perf_tweaks-neoforge-1.21.1-1.3.0.jar
16 Jun 2026
perf_tweaks-forge-1.20.1-1.4.0.1
perf_tweaks-forge-1.20.1-1.4.0.jar
29 May 2026
perf_tweaks-fabric-1.20.1-1.4.0.1
perf_tweaks-fabric-1.20.1-1.4.0.jar
29 May 2026
perf_tweaks-fabric-1.20.1-1.4.0
perf_tweaks-fabric-1.20.1-1.4.0.jar
28 May 2026
perf_tweaks-forge-1.20.1-1.4.0
perf_tweaks-forge-1.20.1-1.4.0.jar
28 May 2026
performancetweaks-forge-1.3.1
performancetweaks-forge-1.3.1.jar
12 Mar 2026
performancetweaks-forge-1.3.0
performancetweaks-forge-1.3.0.jar
7 Mar 2026
performancetweaks-fabric-1.3.0
performancetweaks-fabric-1.3.0.jar
7 Mar 2026
performancetweaks-fabric-1.2.0
performancetweaks-fabric-1.2.0.jar
6 Mar 2026
performancetweaks-neoforge-1.2.0
performancetweaks-neoforge-1.2.0.jar
6 Mar 2026
performancetweaks-fabric-1.2.0
performancetweaks-fabric-1.2.0.jar
4 Mar 2026
Looking for an older file? The official CurseForge project page is in Resources.
