Creating a JFR report

1. Launch Minecraft with Fabric.
2. Download the latest release and add it in the mods folder.
3. Start by running the /jfr start command and generate new terrain.
4. Run /jfr stop. This will create a file at .minecraft/debug/client-*.jfr.

Analyzing the JFR report

1. Download and install the JDK Mission Control tool.
2. In Mission Control, navigate to File > Open File... and select the JFR report.
   !jmc_SuUZYxQXXM
3. Select the Even Browser Page in the Outline.
   !jmc_rvRbBmPA1r
4. Find the Minecraft > World Generation > Feature Placement event type, and select it.
5. Create a new page with just this event type.
   !jmc_0pSlSrsXNA
6. Because the JFR file has an event for each feature placement per chunk, it is useful to group events.
   !jmc_di6ct6Eoin !jmc_HvCkGq9xMT
7. In this view, you can show average and total durations. It is now really easy to see which features are the bottlenecks.
   !jmc_FwmZ5h4ZDg !jmc_DxJRDkXVTw