
Modrinth · Minecraft mod
Crystal Optimizer
Instant crystals and anchors with zero server delay — a lightweight, client-side mod that makes Crystal & Anchor PvP feel smooth and responsive. 100% legit, no cheat, anti-cheat safe.
Quick answer
Which Crystal Optimizer release should I use?
Crystal Optimizer 1.21.4 targets 1.21.4 with Fabric. It must be installed on the client. Do not install it on the dedicated server. No extra mods listed for this file.
Where it goes
Is Crystal Optimizer required on the client, server, or both?
It must be installed on the client. Do not install it on the dedicated server.
This file is marked client-only.
What else does Crystal Optimizer 1.21.4 need?
1.21.4. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Crystal Optimizer without breaking your instance.
Built for Crystal Optimizer 1.21.4. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.21.4. It targets 1.21.4 with Fabric; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
It must be installed on the client. Do not install it on the dedicated server.
- 04
Pick the file you checked
Use the “Get this file” button beside 1.21.4. It opens that exact file at the source.
About this project
What does Crystal Optimizer add?
Flecky's Crystal Optimizer
The optimization mod for Crystal PvP and Anchor PvP – for faster, smoother and more responsive gameplay.
CrystalOptimizerSync makes placing crystals, breaking crystals and igniting anchors feel instant, without the annoying server delay. On top of that come handy performance options for more FPS in big fights.
100% client-side and no cheat – no reach, no damage changes, no combat automation and no modified or extra packets sent to the server. The server always behaves exactly like in vanilla. Nothing is exploited, everything runs only on your own client – the game just feels better.
✨ Features
🔮 Crystal Optimization
- Instant Place – Crystals you place appear on your screen instantly, instead of waiting for the server's response. (If the server doesn't accept the crystal after all, it disappears again automatically.)
- Instant Break – Crystals you break disappear instantly, instead of lingering for a moment. If the hit doesn't go through, the crystal reappears automatically.
- Distance Culling – Hides distant crystals so you get more FPS in big fights (optional).
- Static Crystals – Displays crystals still, without spinning and bobbing, for a cleaner view (optional).
⚓ Anchor Optimization
- Instant Replace – Respawn anchors react instantly instead of stuttering briefly. A background timeout makes sure everything always stays correct.
⚡ Performance
- Reduce Particles – Fewer particles for more FPS, with a freely adjustable amount.
- Disable Explosion Particles – For maximum FPS during heavy crystal spam.
- Limit Total Particles – Sets a fixed cap on the maximum number of particles.
- Memory Cleanup – Automatically cleans up in the background (optional).
⚙️ Configuration
All features can be toggled individually via ModMenu + Cloth Config. A global switch disables the entire mod when needed.
💡 Tip: Everything can be turned off or fine-tuned in the ModMenu – set it up exactly how you like. If you want the perfect settings, check out the images in the gallery here on Modrinth and just copy them.
Server operators can disable the mod for their players via the crystaloptimizersync:disable channel (server-side opt-out, complies with Modrinth Content Rules 3.2).
📦 Requirements
- ModMenu (for the settings menu)
- Cloth Config (for the settings menu)
- Java: ≥ 21
- Client-side only
Project description from Modrinth.
Pick your setup
Crystal Optimizer by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.10
1 loader build1.21.9
1 loader build1.21.8
1 loader build1.21.7
1 loader build1.21.6
1 loader build1.21.5
1 loader build1.21.4
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Crystal Optimizer versions and loaders
1.21.4
Crystal Optimizer 1.21.4.jar
1 Sept 2026
1.21.5
Crystal Optimizer 1.21.5.jar
1 Sept 2026
1.21.6
Crystal Optimizer 1.21.6.jar
1 Sept 2026
1.21.7
Crystal Optimizer 1.21.7.jar
1 Sept 2026
1.21.8
Crystal Optimizer 1.21.8.jar
1 Sept 2026
1.21.9
Crystal Optimizer 1.21.9.jar
1 Sept 2026
1.21.10
Crystal Optimizer 1.21.10.jar
1 Sept 2026
1.21.11
Crystal Optimizer 1.21.11.jar
1 Sept 2026
Looking for an older file? The official Modrinth project page is in Resources.