FastTNT
by KarmaSpace
FastTNT speeds up how Minecraft calculates block destruction during large TNT explosions on Fabric servers.
What it does
Vanilla Minecraft works out a TNT explosion by casting many overlapping rays, so the same candidate blocks are checked again and again. FastTNT replaces that step with a block wavefront algorithm that checks each candidate block only once, which cuts the number of calculations during large blasts. Because the resulting explosion shape differs slightly from vanilla, especially around corners and obstacles, the change is visible to anyone watching the blast.
The mod runs on the server, so players who join a Fabric server need nothing installed. It works in singleplayer and on dedicated servers alike. Its configuration is saved automatically, and optimization can be switched on or off, with a choice between optimizing TNT explosions only or all explosions. Mod Menu support is optional and only adds a settings screen. FastTNT requires Fabric API and is published for Fabric 1.21.11 only, under the MIT License; the code is not open source.
Key features
Wavefront explosion calculation
Candidate blocks are processed in a wavefront order, so each one is evaluated once instead of once per overlapping ray.
Toggleable optimization
The optimization can be enabled or disabled, so the vanilla explosion calculation can be restored at any time.
TNT-only or all explosions
A setting selects whether only TNT explosions use the faster method or every explosion in the game does.
Automatic configuration saving
Changes to the settings are written to the configuration file without a separate save step.
Gallery
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.
Optional 1
Use cases
TNT-heavy server builds
Server owners running TNT-heavy builds or events can reduce the calculation work done during big explosions.
Who it’s for: Server owners running Fabric 1.21.11 who want faster TNT explosions. Players only need to join the server.
How it compares
TNT Optimizer is also a Fabric 1.21.11 server-side mod under the MIT License, but it is not open source. TNTQueue is server-side and open source under the Mozilla Public License 2.0, with Fabric files for 1.21 – 1.21.10, so it covers older versions. Panda TNT Fusion is server-side, open source under CC0 1.0 Universal, and published for 1.21.1 – 26.3.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| FastTNT | Fabric | 1.21.11 | Server-side only | 2026-08-26 |
| TNT Optimizer | Fabric | 1.21.11 | Server-side only | 2026-06-18 |
| TNTQueue | Fabric | 1.21 – 1.21.10 | Server-side only | 2025-12-21 |
| Panda TNT Fusion | Fabric | 1.21.1 – 26.3 | Server-side only | 2026-10-04 |
Questions
Does FastTNT need Fabric API?
Do players need FastTNT installed?
Can FastTNT be disabled for some explosions?
Is Mod Menu required to change the settings?
In the catalog
FastTNT is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from KarmaSpace
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What the author says
Fast TNT BFS is a server-side performance optimization mod for Fabric 1.21.11. Minecraft normally calculates TNT explosions using many overlapping rays, causing the same blocks to be checked repeatedly. This mod replaces that process with an efficient block wavefront algorithm, significantly reducing unnecessary…
Official listing
- Modrinth page
- modrinth.com/mod/fasttnt
- Owner
- KarmaSpace
- Published
- 2026-08-26
- Updated on Modrinth
- 2026-08-26
- Facts verified
- 2026-10-15