Type /clogger start, play for a while, then /clogger stop. You get a text report with the biggest problems at the top, with numbers and suggested fixes.
- FPS, TPS and lag spikes
- Which mod is using the most time
- Entities, busy chunks, memory and save lag
- Log warnings and errors grouped by mod
- System info and the full mod list
Works on the client (measures your game on any server), on a server (measures the server), or both. Nothing runs until you start it and nothing is sent anywhere. Reports are saved in the clogger folder.

