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Profile JavaScript performance with Firebug

Using Firebug, you can test which file of your web page is causing the delayed loading of the page.

We have to open Firebug > Console and then click Profile. You need to reload the page you are testing. Then click Profile again and you will find a report in the console.

profile javascript firebug

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https://www.w3resource.com/web-development-tools/measure-performance-of-JavaScript-code-with-Firebug.php