FluidCore

FluidCore optimizes Minecraft fluid ticks using a smart sleep/wake system. Water and lava blocks far from players or stabilized are put to sleep, reducing fluid tick CPU usage by 13%+ without breaking vanilla behavior.

by EmiriqueOptimization Utility

Fabric

Loaders: Fabric
Downloads on Modrinth: 223
Followers on Modrinth: 2
version: 1
Updated: July 1, 2026Jul 1
Published: in 2026

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At a glance

Runs on Fabric

For Minecraft 1.20.1

Server only — players don't need to install it

Latest version — 1.0.0 from July 1, 2026

Requires Fabric API

License MIT — free

Where it's needed

In gamenot neededOn serverrequired

Install on the server only; players don't need it

Game versions1.20.1

FluidCore - Minecraft fluid performance optimization mod banner

FluidCore

FluidCore is a lightweight Fabric performance mod that optimizes Minecraft's vanilla fluid tick system for both singleplayer and multiplayer servers.

How It Works

Vanilla Minecraft ticks every single water and lava block every few game ticks — even blocks that haven't changed in minutes, and even when no player is nearby. FluidCore introduces a smart sleep/wake system that eliminates this wasted CPU time.

Distance-based sleeping — Fluid blocks farther than 96 blocks from any player are put to sleep and stop ticking
Stability counter — Fluid blocks that haven't changed for 60 ticks are gradually put to sleep, even near players
Event-driven wake-up — Sleeping fluids instantly wake up when a nearby block changes, ensuring correct behavior
Chunk unload cleanup — Sleeping fluid data is automatically cleaned when chunks unload, preventing memory leaks
Both source and flowing blocks — Optimizes both water/ lava source blocks and flowing blocks

Benchmarks

Tested with Spark profiler on Fabric 1.20.1:

Metric	Vanilla	FluidCore	Improvement
Fluid tick CPU usage	2.63%	2.29%	~13% reduction

Tested on a flat world with a large water area. Results may vary depending on world complexity.

Compatibility

✅ Fabric 1.20.1
✅ Works in singleplayer
✅ Compatible with vanilla clients (server-side only)
✅ Compatible with Sodium, Lithium, and other performance mods

Installation

Install Fabric Loader
Install Fabric API
Drop FluidCore into your mods folder
Launch the game

Enjoy!

FAQ

How to install FluidCore?

Install Fabric for your Minecraft version, download FluidCore for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does FluidCore support?

FluidCore has builds for Minecraft 1.20.1.

Is FluidCore needed on the server?

Server only — players don't need to install it

License and source

MIT Licensefree to use and share with credit to the author

Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders