Worldgen profiling
Adds custom JFR events to profile world generation
About this Mod
Creating a JFR report
- Launch Minecraft with Fabric.
- Download the latest release and add it in the
modsfolder. - Start by running the
/jfr startcommand and generate new terrain. - Run
/jfr stop. This will create a file at.minecraft/debug/client-*.jfr.
Analyzing the JFR report
- Download and install the JDK Mission Control tool.
- In Mission Control, navigate to
File > Open File...and select the JFR report.
- Select the
Even BrowserPage in the Outline.
- Find the
Minecraft > World Generation > Feature Placementevent type, and select it. - Create a new page with just this event type.
- Because the JFR file has an event for each feature placement per chunk, it is useful to group events.
- In this view, you can show average and total durations. It is now really easy to see which features are the bottlenecks.
Available Versions
How to Install Worldgen profiling on Your Server
Order Server
Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.20.4).
Install Mod
Open the mod browser in the dashboard and search for "Worldgen profiling". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.20.4, 1.20.3, 1.20.2 (+10 more)
Server-side
✓ RequiredRecommended RAM
6 GB(min. 4 GB)Frequently Asked Questions
Worldgen profiling 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 4 GB RAM is allocated and the loader matches the mod version (1.20.4). You can switch loaders with one click in the panel.
Is Worldgen profiling compatible with fabric?
Worldgen profiling officially supports fabric for Minecraft 1.20.4, 1.20.3, 1.20.2. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Worldgen profiling – how to optimize performance?
Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Worldgen profiling 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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