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I have tried 

window.navigator.connection.downlink

but I didn't get proper result. I don't want to use any packages from fast, speedtest, ookla cause they required CORS.

BHAR4T
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    Possible duplicate of [How to detect internet speed in JavaScript?](https://stackoverflow.com/questions/5529718/how-to-detect-internet-speed-in-javascript) – Tigger Dec 01 '18 at 09:49
  • Take a look at [this](https://stackoverflow.com/questions/5529718/how-to-detect-internet-speed-in-javascript) question. It's an onld question but it can help you to go in the right direction. – Matteo Meil Dec 01 '18 at 09:53

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