LoTAS-Light

LoTAS-Light

Tools for creating Tool-Assisted Speedruns in MC 1.21+

by
21.2K Downloads
fabricutility
Rent Server with this Mod

Screenshots

Clickable chat links for savestates
Name savestates after creation

About this Mod

LoTAS-Light

Continuation of LoTAS for versions higher than 1.20.3, but with a reduced feature set

Needs Fabric-API

Why remove features?

  1. Updating LoTAS to new versions was always very tedious due to the large feature set… Testing and verifying each feature was hard and with Mojangs faster release schedule, we could not keep up (especially if Mojang rewrites everything between minor versions)
  2. Mojang patched a lot of things, so LoTAS's features would be reduced either way

Features

Improved /tick command

  • /tick rate supports tickrates lower than 1
  • A second /tick freeze by simply typing /tick rate 0, which also freezes the player
  • Tickrates higher than 20 also affect the player

Tickrate keybinds

Same deal as LoTAS

  • . increases the tickrate
  • , decreases the tickrate
  • F8 toggles /tick rate 0
  • F9 advances 1 tick while the game is frozen

Savestates

  • /savestate command for "quicksaving" and "quickloading" a minecraft world
  • J and K for saving and loading respectively

Item Duplication

  • Press Pause to save the game with the item in your inventory
  • Throw out the item out of your inventory or put it in a chest
  • Press O
  • Rejoin the world

Config

  • /lotaslight for changing the config

No Multiplayer support!!

The reason why this mod doesn't support multiplayer is simply: Savestates.
Basically Mojang never intended a quickloading feature, so to load a different world,
it is intended that you stop the Minecraft server (Imagine restarting and reconnecting to the server for every savestate).
Changing this requires a lot of work, more than I am willing to put into this mod.
If you want to see (somewhat) working multiplayer savestates, check out TASmod

Translations

Help translate this mod with Weblate

Contributions

  • Chinese Simplified
    • Blom
    • BoredYukolin
    • JustaSqu1d
  • French
    • Elvee
  • German
    • ScribbleTAS
  • Italian
    • LeoAnimates
  • Japanese
    • Naruyoko
  • Korean
    • swwgdxed
  • LOLCAT
    • ScribbleTAS
  • Polish
    • 4NTJ
    • NULLderef

Bug reports and TASing help

Bugs can preferably reported on GitHub, but you can also use Discord, where we also provide help!

Available Versions

LoTAS-Light 1.3.5release
MC 26.1, 26.1.1, 26.1.2fabric
April 11, 2026
LoTAS-Light 1.3.5release
MC 1.21.11fabric
April 11, 2026
LoTAS-Light 1.3.5release
MC 1.21.9, 1.21.10fabric
April 11, 2026
LoTAS-Light 1.3.5release
MC 1.21.6, 1.21.7, 1.21.8fabric
April 11, 2026
LoTAS-Light 1.3.5release
MC 1.21.5fabric
April 11, 2026

How to Install LoTAS-Light 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 (26.1.2).

3

Install Mod

Open the mod browser in the dashboard and search for "LoTAS-Light". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

26.1.2, 26.1.1, 26.1 (+16 more)

Server-side

Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

LoTAS-Light 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 (26.1.2). You can switch loaders with one click in the panel.

Is LoTAS-Light compatible with fabric?

LoTAS-Light officially supports fabric for Minecraft 26.1.2, 26.1.1, 26.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with LoTAS-Light – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if LoTAS-Light 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 LoTAS-Light with just one click on your server.

Recommended RAM
4 GBab €8/mo
Min. 3 GB | +1 GB pro 8 Spieler
Create Server Now
1-Click Mod Install
NVMe SSD Storage
DDoS Protection included

Details

License
GNU General Public License v3.0 only
Server-side
Required

Supported Versions

26.1.226.1.126.11.21.111.21.101.21.91.21.81.21.71.21.61.21.5+9 more