ModsJava
Worldgen profiling
Adds custom JFR events to profile world generation. Free Minecraft Java mod for 1.19.3, 1.19.4, 1.20.
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
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.
Verified by MCModsHub
- Ships as worldgen-profiling-1.3.1.jar — drop this file into the mods folder
- Download size: 11 KB
- Download link checked 31 Aug 2026 — working
These come from our own check of the pack file, not from the source page.