What do I benefit from the performance tool?

When I finished implementing the performance tool, I didn’t see anything. Can you communicate the idea and the work of this tool and what did I benefit from it?

I’d recommend clicking the record button to get started.

https://developer.mozilla.org/en-US/docs/Tools/Performance can get you started with a video.

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Will you describe exactly what you already know? It will direct us what we can still tell you