FastFurnace [FABRIC]

FastFurnace [FABRIC]

A performance upgrade for the furnace. [Unofficial Port]

by
6.6K Downloads
fabricoptimizationutility
Configure a Compatible Minecraft Server

About this Mod

About

This is an unofficial port of FastFurnace to Fabric for Minecraft 1.21+. The original mod was developed by shadows_of_fire for Forge/NeoForge.

FastFurnace utilizes mixins to edit the functionality of the Furnace, Blast Furnace, and Smoker, improving their TPS performance (not smelting speed!)

Similar to FastWorkbench, it caches the last recipe used, and checks this recipe first before re-scanning the entire registry. This is significantly faster due to the vanilla furnace scanning the entire furnace registry each tick, which may be fine for vanilla, but in a modded environment, gets very large very quickly.

These changes apply to the Furnace, Blast Furnace, and Smoker. Any mod utilizing AbstractFurnaceTileEntity will also receive the benefits of having this mod installed.

For people who like numbers, here is Vanilla vs FastFurnace. This is 9 furnaces each smelting cobblestone the entire time the test was conducted. The number of invocations is kept roughly the same as to not skew any numbers. This test was conducted in vanilla, which only has ~70 furnace recipes. In a modpack, there could be upwards of 700, significantly increasing the performance gain.

Available Versions

FastFurnace [FABRIC] 9.0.1release
MC 1.21.11fabric
February 24, 2026
FastFurnace [FABRIC] 9.0.1release
MC 1.21.10fabric
February 24, 2026
FastFurnace [FABRIC] 9.0.1release
MC 1.21.9fabric
February 24, 2026
FastFurnace [FABRIC] 9.0.1release
MC 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8fabric
February 24, 2026
FastFurnace [FABRIC] 9.0.1release
MC 1.21.1fabric
February 24, 2026

How to Install FastFurnace [FABRIC] on Your Client

1

Install the Mod Loader Locally

Install fabric for your local Minecraft version.

2

Download the Matching File

Choose the FastFurnace [FABRIC] file for fabric and Minecraft 1.21.11.

3

Install Mod

Place the .jar file in your local .minecraft/mods folder and restart Minecraft. No server-side installation is required.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.11, 1.21.10, 1.21.9 (+6 more)

Server-side

Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Does FastFurnace [FABRIC] need to be installed on the Minecraft server?

No. Modrinth marks FastFurnace [FABRIC] as unsupported on the server side. Install it only in your local Minecraft mods folder. Your server can remain unchanged unless the mod page lists an additional dependency.

Which version and loader does FastFurnace [FABRIC] require?

Use a file for fabric and your exact Minecraft version. Supported versions include 1.21.11, 1.21.10, 1.21.9. Files for different loaders are not interchangeable.

FastFurnace [FABRIC] is not working – what should I check?

First check the Minecraft version, loader version and required dependencies. Put the .jar file in your local .minecraft/mods folder and remove older duplicates. Because this mod is client-side, adding server RAM will not fix it.

Minecraft Server for Your Group

FastFurnace [FABRIC] stays on your client. Host a compatible world for your group.

Recommended RAM
4 GBfrom €5.2/mo
Minimum 3 GB | per 8 players
Create Server Now
Client Compatibility Guide
NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Unsupported

Supported Versions

1.21.111.21.101.21.91.21.81.21.71.21.61.21.51.21.41.21.1