Old Debug Screen
This mod restores the old debug screen (Old F3 Menu) that was changed in version 1.21.9.
Screenshots
About this Mod
This mod restores the old debug screen from Minecraft, which was changed in version 1.21.9. The update removed some features that players found useful for debugging and gameplay. This mod brings back those original features for a more informative experience.
Before
After
Available Versions
How to Install Old Debug Screen 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 (26.1.2).
Install Mod
Open the mod browser in the dashboard and search for "Old Debug Screen". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
26.1.2, 26.1.1, 26.1 (+3 more)
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Old Debug Screen 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 (26.1.2). You can switch loaders with one click in the panel.
Is Old Debug Screen compatible with fabric?
Old Debug Screen officially supports fabric for Minecraft 26.1.2, 26.1.1, 26.1. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Old Debug Screen – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Old Debug Screen 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.
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Rent Modded Server
Install Old Debug Screen with just one click on your server.