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Why is my ping higher when my charger is plugged into my Dell Precision M6800 laptop?

I recently noticed that the reason my Wi-Fi was so terrible… It seems like it was caused by me plugging in my charger.

Here is a little video of it happening, trying to ping `riot.de`

Here is the ping when plugged in:

And here, when it isn't:

What could be causing this issue ?

I tried updating my Wi-Fi drivers and resetting my power settings, to no avail. I am running Windows 10 and using a Dell Wireless 1550 802.11ac.

Here are the main power settings:

Just got similar result after testing it within the Windows sandbox (Which should put aside the problem behind cause by bloatware, right ?).

First plugged in, then not:

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