Cerulean Mod optimizes how Minecraft checks for advancements to help reduce lag. This is especially helpful in large modpacks where the game can slow down when you pick up many items. The mod is an updated fork of Icterine, with extra features to improve performance.
Features:
- Reduces lag from advancement checks, particularly when you pick up items.
- Adds an option to process advancements every few ticks for better performance.
- Makes sure the first time you pick up an item, it is checked for achievements right away.
- Works with vanilla advancements and most other mods and datapacks.
- Lets you turn its features on or off in a config file.
- Runs entirely on the server-side and has no known conflicts with other mods.
Screenshots:
Cerulean Mod Download Links
For Minecraft 1.21.1, 1.21
Fabric Version: Download from Server 1 – Download from Server 2
NeoForge Version: Download from Server 1 – Download from Server 2
For Minecraft 1.20.1, 1.20
Forge Version: Download from Server 1 – Download from Server 2
Fabric Version: Download from Server 1 – Download from Server 2
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.1, 1.20.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: In MC Java Mods, or directly above on this page.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Downloads as 177447.mcaddon
- Download size: 920 KB
- Download link checked 25 Jul 2026 — working
- Mirrored on our own servers — the download does not depend on the original host
These come from our own check of the pack file, not from the source page.