SGUProfiler

The mod samples the cost of each entity during the server tick, covering AI, entity tick, movement and teleport, and collisions. Its reports show how many milliseconds each sampled bucket used per tick, so a server owner can see which dimension or entity group takes the most time while a profiling window is open. Because the numbers are per sampled tick for each bucket, they are not the same as the whole-server MSPT shown by F3, and the row totals should not be read as server MSPT.

Reports are printed in chat with Carpet's Messenger styling when Carpet is present, so installing Carpet with its intended colors gives the cleanest output. Carpet is needed to profile bot Attack and Use splits, which separate fake-player time from the other ActionPack buckets. Optional dimension filters narrow the output to bot-only mode for Carpet players. Without Carpet, the core profiling still runs.

The mod is released under the MIT License and is open source. Either side can run it, and neither needs it, so a server can add it without requiring players to install anything. It requires Fabric Loader 0.16.0 or later, Fabric API matching the Minecraft version, and Java 21 or newer. Use a Carpet build compatible with the Minecraft version in use.