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…
⬇ Download on Modrinth
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!
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 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: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as fluidcore-1.0.0.jar — drop this file into the mods folder
- Download size: 14 KB
- Download link checked 24 Aug 2026 — working
These come from our own check of the pack file, not from the source page.