Hello. How to find out the download speed of the script in js?

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    You can see the developer tools in the browser, usually on the network tab it shows how long it took to download a particular file - Grundy
  • What exactly? Hit request and / or waiting for response and / or file download and / or processing and / or execution? Similar information is provided in the developer’s tools, an extremely useful tool. - user207618

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On JS it is impossible to know, because JS code will be executed after the download.