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XPS 15 9550 inconsistent wifi-speeds

When I try my wifi speed on my XPS 15 9550 I get really different results depending on how I test it.

On I get my full internet speed of 500Mbps.

If I try I get around 270 Mbps.

Doing an HTTP download from I only get around 40Mbps.

I also tried downloading a file from a samba share on my server and get around 130Mbps.

All these sources max out my connection if I try over a wired connection.

I have also tried changing the Dell Wireless 1830 with an Intel AC 8265 and that didn't make any difference.

I also tried putting the 1830 card into an Intel NUC and got much closer to my max connection so I think it's safe to assume the card is not the issue here.

Where should I look into next?

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