What is this?

Observable profiles (tile) entities and shows you what's taking up tick time and where. It's available for Minecraft 1.16 - 1.20 (with early builds for 1.21 available here) on (Neo)Forge and Fabric. Get it on CurseForge, Modrinth, or GitHub.

How do I use it?

First, make sure you have permissions to run it. By default, only server operators can use the tool. They can allow everyone to use the tool by running:

/observable set allPlayersAllowed true to allow everyone, or
/observable allow <username> to allow a specific user.

Once that's taken care of, bind the "Show profiler screen" key to whatever you prefer, or run /observable run <duration> if you're an operator.

I'm still confused!

I have an incomplete wiki available here or you can talk to me on Discord.