Eternal Starlight Fix

By
Saereth
Mods

Performance fix for Eternal Starlight - caches book progression data to eliminate TPS lag caused by repeated data storage hits.

ESFix

A lightweight performance fix for Eternal Starlight.

The Problem

Eternal Starlight's book unlock system calls getOrCreateBookProgressions() for every inventory slot every 200 ticks. Each call hits data storage multiple times with no caching, causing significant TPS lag on servers - especially with multiple players online.

The Solution

ESFix adds a simple mixin that caches book progression data for 5 seconds per player, dramatically reducing data storage access and improving server performance.

Requirements

- NeoForge 1.21.1 - Eternal Starlight

Installation

Drop the jar in your mods folder alongside Eternal Starlight.

PS Yes, I know the logo is terrible, CF makes me put something there.

The Eternal Starlight Fix Team

18
Followers
19
Projects
738.5K
Downloads

More from SaerethView all

Compact Machines Preview Fixer
BySaereth
- 25
- Mods
Fixes the severe memory leak when previewing Compact Machines rooms. Opening a preview can chew through hundreds of MB to multiple GB of RAM that never gets freed, eventually crashing the game. This client side mod cleans that up.
- 25
- May 23, 2026
- Mods
- +1
View
Install
Create: AeroPortals
BySaereth
- 973
- Mods
Sail your Create: Aeronautics airships through a MC or Modded portals and the whole ship goes with you. Players, passengers, decorations, and more travel together. AeroPortals is the bridge between Create's airships physics and Minecraft's portal systems.
- 973
- May 23, 2026
- Mods
- +3
View
Install
Horse Powered
BySaereth
- 12.7K
- Mods
Hand-cranked and animal-powered machinery focusing on early game grinding, chopping, pressing, drying, and crushing. Leash horses, donkeys, or llamas to automate the line or generate Forge Energy. Data-driven recipes with full JEI, EMI, and Jade support.
- 12.7K
- May 22, 2026
- Mods
- +2
View
Install
Just Trial Spawners
BySaereth
- 312
- Mods
Backports Minecraft 1.21's Trial Chamber features to Forge 1.20.1. Trial spawners, vaults, breeze, bogged, wind charges, ominous mode, trial-themed mob effects, with full 1.21.1 Trial spawner functionality.
- 312
- May 22, 2026
- Mods
View
Install

Compact Machines Preview Fixer
BySaereth
- 25
- Mods
Fixes the severe memory leak when previewing Compact Machines rooms. Opening a preview can chew through hundreds of MB to multiple GB of RAM that never gets freed, eventually crashing the game. This client side mod cleans that up.
- 25
- May 23, 2026
- Mods
- +1
View
Install
Create: AeroPortals
BySaereth
- 973
- Mods
Sail your Create: Aeronautics airships through a MC or Modded portals and the whole ship goes with you. Players, passengers, decorations, and more travel together. AeroPortals is the bridge between Create's airships physics and Minecraft's portal systems.
- 973
- May 23, 2026
- Mods
- +3
View
Install
Horse Powered
BySaereth
- 12.7K
- Mods
Hand-cranked and animal-powered machinery focusing on early game grinding, chopping, pressing, drying, and crushing. Leash horses, donkeys, or llamas to automate the line or generate Forge Energy. Data-driven recipes with full JEI, EMI, and Jade support.
- 12.7K
- May 22, 2026
- Mods
- +2
View
Install
Just Trial Spawners
BySaereth
- 312
- Mods
Backports Minecraft 1.21's Trial Chamber features to Forge 1.20.1. Trial spawners, vaults, breeze, bogged, wind charges, ominous mode, trial-themed mob effects, with full 1.21.1 Trial spawner functionality.
- 312
- May 22, 2026
- Mods
View
Install