CurseForge · Minecraft mod
XFermium
Lightweight optimization project that aims to optimize, fix/reduce lag and improve overal performance (FPS/TPS)
Quick answer
Which XFermium release matches 26.2 Forge?
XFermium-v1.1.5_MOD.jar targets 1.16.3, 1.17.1, 1.21 with Fabric, Forge, NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 1 required mods have matching files.
Where it goes
Is XFermium 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 XFermium-v1.1.5_MOD.jar need?
XFermium-v1.1.5_MOD.jar on 26.2 Forge. Every mod below is checked against that same setup.
Install FokusAPI first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add XFermium without breaking your instance.
Built for XFermium-v1.1.5_MOD.jar on 26.2 Forge. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use XFermium-v1.1.5_MOD.jar. It targets 1.16.3, 1.17.1, 1.21 with Fabric, Forge, NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install FokusAPI first. We found matching files for this game-version and loader setup.
- 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 XFermium-v1.1.5_MOD.jar. It opens that exact file at the source.
About this project
What does XFermium add?
Require FokusAPI to work correctly, please install it
Lightweight optimization project that aims to optimize, fix/reduce lag and improve overal performance (FPS/TPS)
Features
- Tweak multiple entities collision, collide rule
- Optimize player movements for server/client smoothness
- Faster Minecraft RB by making it running if it necessary, not too frequently
- Tweak some entities mechanic and optimize Experience Orbs entity for mobs farm, etc…
- Optimize minecraft's random tick speed & mods scheduling, reduce the latency - improve TPS
Optimize & tweak item entities, espicially for some type of items with large quantity such as cobblestone,netherrack,etc… , greatly improve performance- (This feature has been splitted into a standalone mod - Recommend to install with XFermium: Enhanced Item Entities
Comparison
Before

After

Incompatibility
None
Try my other mods
- Brutal Nightmare - Minecraft, but with insane difficulty. Zombie place/break blocks, throw TNT. Skeleton, Creeper, Ghasts, Spider,Phantom,… get new abilities.New mini bosses…
- Double Jump - Add Double Jump and Leap mechanic to minecraft with sneak button!
- Adrenaline Rush - Add "final shout" & "second chance" mechanic into minecraft! You'll have 0,5 HP instead of dying when fall from height ; Buff your power when you at low HP
- Wall Climbing - Add Wall Climb (Wall Jump) mechanic to minecraft
- Useful Snowball - Useful Snowball! Make snowball slow mob.
- AwfulLightning - Makes Lightning strucks on players more oftenly, can create fun & surprising deaths with lightning bolts!
Project description from CurseForge.
Pick your setup
XFermium by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.2
3 loader builds26.1.2
4 loader builds26.1.1
4 loader builds26.1
4 loader builds1.21.11-snapshot
4 loader builds1.21.11
4 loader builds1.21.10
4 loader builds1.21.9-snapshot
4 loader builds1.21.9
4 loader builds1.21.8
4 loader builds1.21.7
4 loader builds1.21.6-snapshot
4 loader buildsShowing the newest 12 of 57 game versions. Older files are in the list below.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
XFermium versions and loaders
XFermium-v1.1.5_MOD.jar
18 Jul 2026
Looking for an older file? The official CurseForge project page is in Resources.