GlassSync

A mod for Hypixel Skyblock that fixes the clientside desync of glass pane block states on 1.21. This allows for easier aiming at glass panes for gemstone mining.

3.0K Downloads

fabricgame-mechanicsoptimizationutility

Rent Server with this Mod

About this Mod

This mod fixes Hypixel Skyblock's Glass Pane client blockstate desync issue on 1.21.5, allowing for gemstone mining to be easier and more efficient.

This mod makes the client update the blockstate manually, rather than waiting for an update packet from the server. The block shown on the client will then replicate what is on the server.

Available Versions

GlassSync 1.1.0release

MC 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11fabric

January 26, 2026

GlassSync 1.0.0release

MC 1.21.5fabric

July 9, 2025

How to Install GlassSync on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

Install Mod

Open the mod browser in the dashboard and search for "GlassSync". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.11, 1.21.10, 1.21.9 (+4 more)

Server-side

✗ Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

GlassSync server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.

Is GlassSync compatible with fabric?

GlassSync officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.9. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with GlassSync – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if GlassSync consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.