How can I calculate how much processing power a piece of javascript code uses?

I would like to calculate how much processing power (in percentage, ideally) a certain piece of javascript code code uses. What are some known approaches I can use to calculate this?

Solution

You can visualise the CPU performance using Google Chrome Devl Tools

https://developers.google.com/web/tools/chrome-devtools/profile/rendering-tools/js-execution?hl=en

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