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CurseForge · Minecraft mod
End Crystal Optimizer
Fixes waiting on the server after crystal break before end crystal entities are cleaned.
Choose a version Pick your version below, then grab the matching file.
Quick answer
Which End Crystal Optimizer release matches Fabric?
Best match for your filters Crystal Optimizer-1.21.X-1.0.3.jar
Game version 1.21, 1.20.5, 1.21.4
Loader Fabric
End Crystal Optimizer Crystal Optimizer-1.21.X-1.0.3.jar targets 1.21, 1.20.5, 1.21.4 with Fabric. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is End Crystal Optimizer required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
Client Source doesn’t say
Dedicated server Source doesn’t say
Loader for this release Fabric
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume
The source does not explicitly classify this release as client-only or server-only.
What else does End Crystal Optimizer Crystal Optimizer-1.21.X-1.0.3.jar need?
Crystal Optimizer-1.21.X-1.0.3.jar on Fabric. Every mod below is checked against that same setup.
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 End Crystal Optimizer without breaking your instance.
Built for End Crystal Optimizer Crystal Optimizer-1.21.X-1.0.3.jar on Fabric. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use Crystal Optimizer-1.21.X-1.0.3.jar. It targets 1.21, 1.20.5, 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
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside Crystal Optimizer-1.21.X-1.0.3.jar. It opens that exact file at the source.
About this project
What does End Crystal Optimizer add?
Overview
Crystal Optimizer is a performance-focused mod that improves the responsiveness of end crystal usage by removing crystals client-side immediately after they break, rather than waiting for the server to process and remove the entity. This results in smoother gameplay and reduced perceived delay, especially for players with higher latency.
Supported Platforms & Versions
| Platform | Supported Versions |
|---|---|
| Fabric | 1.19 – 1.21.11 |
License
This project is licensed under the MIT License.
Disclaimer: I am not responsible for any restrictions resulting from the use of this mod.
Project description from CurseForge.
Pick your setup
End Crystal Optimizer by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
Minecraft version
1.21.4
1 loader buildMinecraft version
1.21.3
1 loader buildMinecraft version
1.21.2
1 loader buildMinecraft version
1.21.1
1 loader buildMinecraft version
1.21
1 loader buildMinecraft version
1.20.6
1 loader buildMinecraft version
1.20.5
1 loader buildMinecraft version
1.20.4
1 loader buildMinecraft version
1.20.3
1 loader buildMinecraft version
1.20.2
1 loader buildMinecraft version
1.20.1
1 loader buildShowing the newest 12 of 18 game versions. Older files are in the list below.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
End Crystal Optimizer versions and loaders
Crystal Optimizer-1.21.X-1.0.3.jar
31 Jan 2026
Client Source doesn’t say Server Source doesn’t say Dependencies No extras listed Listed on Release listing
Check the 1.21.4 · Fabric setup 1.21Fabric1.20.51.21.4 release
Crystal Optimizer-1.21.11-1.0.5.jar
31 Jan 2026
Client Source doesn’t say Server Source doesn’t say Dependencies No extras listed Listed on Release listing
Check the 1.21.11 · Fabric setup Fabric1.21.11 release
Crystal Optimizer-1.20.4-1.0.3.jar
31 Jan 2026
Client Source doesn’t say Server Source doesn’t say Dependencies No extras listed Listed on Release listing
Check the 1.20.4 · Fabric setup 1.20.2Fabric1.20.41.20.3 release
Crystal Optimizer-1.19.X-1.0.3.jar
31 Jan 2026
Client Source doesn’t say Server Source doesn’t say Dependencies No extras listed Listed on Release listing
Check the 1.20.1 · Fabric setup 1.19.31.19.4Fabric1.20.1 release
Looking for an older file? The official CurseForge project page is in Resources.
