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Cerulean

Mod

Advancements optimization mod, updated fork of Icterine with added features

Type

Mod

Modrinth Downloads

2,066,845

Modrinth ID

dv57xmf9

Last Updated

Jul 27, 2026

Description

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Cerulean is a mod that optimizes Minecraft's advancement checking system, specifically the laggy InventoryChangeTrigger, which can cause heavy lag in modpacks with lots of modded advancements. It is a fork of Icterine, updated to modern versions and with additional features.

Aside from being updated to 1.21.1, Cerulean adds an option to only process advancements every few ticks, which is the strategy used by mods like Achievements Optimizer (which does not work with the original Icterine). This option is handled in a way that ensures the first time an item is picked up per player, it is always processed for achievements--preventing cases where advancements would stall until you moved items around.

From the original mod page:

  • Optimizes triggering advancements for obtaining items;
  • Might break parity with vanilla, but doesn't affect vanilla advancements and shouldn't affect the vast majority of mods/datapacks;
  • Even if it does affect something, advancement still should be obtainable by just dropping and picking up one of required items;
  • Currently, there are no known incompatibilities or issues;
  • Every injection into vanilla code can be disabled in config file.
  • All changes are server-side.

demo

Compatibility

Mod Loaders

Fabric Forge Neoforge

Game Versions

1.20 1.20.1 1.21.1

Screenshots

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Included in Modpacks

Create: Kryp Create: Kryp Better MC [FORGE] - BMC4 Better MC [FORGE] - BMC4 Bubble Cobble Redux Bubble Cobble Redux Trusted Modded Trusted Modded Better OneBlock Better OneBlock Sengoku Chronicles Sengoku Chronicles Create+ Create+ Pix Vulka Optimizations Pix Vulka Optimizations Pix Android Boost Pix Android Boost Era do Panado II Era do Panado II Redstone Witch [Lite] Redstone Witch [Lite] RothCraft RothCraft Whittled & Wistful Whittled & Wistful Create: Basically Everything Create: Basically Everything Refabricated Beta Refabricated Beta The Real New World The Real New World Beta Decay Beta Decay Simplicity Refabricated: Vanilla+ Simplicity Refabricated: Vanilla+ Create: Just Extended ModCraftTech-servers ModCraftTech-servers [balls_game_2] [balls_game_2] OptiMizaPion OptiMizaPion Create - Brand New World Create - Brand New World Better MC [NEOFORGE] BMC5 Better MC [NEOFORGE] BMC5 Omnicraft: Ben 10 [Alien Evo] Omnicraft: Ben 10 [Alien Evo] Better MC [FABRIC] BMC3 Better MC [FABRIC] BMC3 Horrorland 2 - Psychological and Classic Horror Modpack (with Horror Quests) Horrorland 2 - Psychological and Classic Horror Modpack (with Horror Quests) Elden Kingdom Elden Kingdom Shenanigans Shenanigans Hidecraft Modpack Hidecraft Modpack ZoeyNeko's Create Modpack ZoeyNeko's Create Modpack VictoriaCraft VictoriaCraft Arcane Dragons [NEOFORGE] Arcane Dragons [NEOFORGE] Arcane Dragons [FABRIC] Arcane Dragons [FABRIC] Horrorland - With Horror Quests! Horrorland - With Horror Quests! Elysium Days Elysium Days Create: Physics And Aeronautics Create: Physics And Aeronautics Guns&Fun Guns&Fun Better MC [FABRIC] BMC2 Better MC [FABRIC] BMC2

External Resources

Modrinth Source Code Issues