FastFurnace
Installed on a server, FastFurnace reduces the work that Furnace and Blast Furnace blocks do each tick by caching the last recipe they used.
What it does
The mod changes how smelting blocks look up recipes. Instead of scanning the whole furnace registry on every tick, a block first checks the recipe it used last, and only falls back to a full scan when that recipe no longer matches. The aim is lower tick time on the server, not faster smelting, so the speed of each smelt stays the same.
The mod affects the vanilla Furnace and Blast Furnace, and any other mod that builds on the furnace base class also gets the benefit. The author measured nine furnaces smelting cobblestone in vanilla, which has about 70 furnace recipes; packs with several hundred recipes are expected to gain more, because the full scan grows with every added recipe. Placebo is required, and the mod runs on Forge and NeoForge.
Files cover the game versions 1.20.1 – 26.1.2, with builds for 1.20.1, 1.21.1 and 26.1.2. The source code and issue tracker are public. The code is released under the MIT License, so the mod is open source.
Key features
Cached recipe lookup
Each smelting block remembers its last recipe and checks it before scanning the full registry.
Tick cost reduction
The full registry scan runs far less often, which lowers the per-tick load of many furnaces.
Support for furnace subclasses
Mods that extend the furnace base class receive the same recipe caching without extra setup.
Vanilla recipe behavior kept
Smelting results and speed match vanilla; only the lookup path is changed.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Modpacks with many recipes
Packs that add hundreds of smelting recipes benefit most, since the full scan costs more as the registry grows.
Busy multiplayer servers
Servers with many furnaces running at once can reduce the time spent on furnace logic each tick.
Who it’s for: Server owners and modpack builders who run many furnaces, blast furnaces or smokers, or use mods that add a large number of smelting recipes.
Questions
Does FastFurnace make smelting faster?
Does FastFurnace need Placebo?
Does the mod have to be installed on both sides?
In the catalog
FastFurnace is one of 3,545 Optimization mods on ModsFinder, and one of 1,441 Optimization mods for Forge. 15,189 mods support Minecraft 26.1.2.
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What the author says
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…
Official listing
- Modrinth page
- modrinth.com/mod/fastfurnace
- Owner
- Shadows-of-Fire
- Published
- 2026-06-14
- Updated on Modrinth
- 2026-06-19
- Facts verified
- 2026-10-15