FastFurnace [FABRIC]

FastFurnace [FABRIC]

A performance upgrade for the furnace. [Unofficial Port]

by
4.0K Downloads
fabricoptimizationutility
Rent Server with this Mod

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 Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

3

Install Mod

Open the mod browser in the dashboard and search for "FastFurnace [FABRIC]". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

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

FastFurnace [FABRIC] server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.

Is FastFurnace [FABRIC] compatible with fabric?

FastFurnace [FABRIC] officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.9. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with FastFurnace [FABRIC] – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if FastFurnace [FABRIC] consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install FastFurnace [FABRIC] with just one click on your server.

Recommended RAM
4 GBab €8/mo
Min. 3 GB | +1 GB pro 8 Spieler
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1-Click Mod Install
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