CurseForge · Minecraft mod

LightSpeedRe - Launch optimizations

Reduces your waiting time by loading modpacks significantly faster (currently 48% - 71%)

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which LightSpeedRe - Launch optimizations release should I use?

Updated 10 days ago

Latest stable file lightspeed-1.21.1-1.2.3.jar

Game version 1.21.1

Loader NeoForge

LightSpeedRe - Launch optimizations lightspeed-1.21.1-1.2.3.jar targets 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.

Where it goes

Is LightSpeedRe - Launch optimizations required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say

Dedicated server Source doesn’t say

Loader for this release NeoForge

Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does LightSpeedRe - Launch optimizations lightspeed-1.21.1-1.2.3.jar need?

lightspeed-1.21.1-1.2.3.jar. Change the file and its required mods may change too.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add LightSpeedRe - Launch optimizations without breaking your instance.

Built for LightSpeedRe - Launch optimizations lightspeed-1.21.1-1.2.3.jar. Pick another file and the loader, install side or required mods may change.

01
Stick to this file

Use lightspeed-1.21.1-1.2.3.jar. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
02
Bring the mods it needs

This file does not list any required mods. Do not add a library just because a different file uses it.
03
Put it on the correct side

The project page does not say whether this file belongs on the client, dedicated server, or both.
04
Pick the file you checked

Use the “Get this file” button beside lightspeed-1.21.1-1.2.3.jar. It opens that exact file at the source.

About this project

What does LightSpeedRe - Launch optimizations add?

This is a high-version (1.20.1+) port of the Lightspeed mod.
It removes the model-baking optimizations that were already implemented in vanilla Minecraft 1.20.1, keeping only the resource-pack cache feature, which speeds up launch times.
(Currently, only ports for Forge 1.20.1 and NeoForge 1.21.1 are planned.)

Since version 1.2.0+, this mod introduces high-concurrency loading to improve startup speed. If you encounter any issues while using this mod, please try disabling the related option in the configuration file.

Project description from CurseForge.

Pick your setup

LightSpeedRe - Launch optimizations by Minecraft version and loader

Choose the version and loader you play, then open the matching release.

2 available setups

Minecraft version

1.21.1

1 loader build

NeoForge lightspeed-1.21.1-1.2.3.jar 8 stable files · 8 total · 17 Aug 2026

Minecraft version

1.20.1

1 loader build

Forge lightspeed-1.20.1-1.2.3.jar 9 stable files · 9 total · 17 Aug 2026

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files