Ben HardillStarted on the Christmas tech support already, Dad's Win11 Dell XPS13 laptop won't speed test above 500mbps, usually closer to 300mbps (on 1000/100 FTTP) either via WiFi 6 or USB-C 1gbps Eth adapter with 2m cat6a cable direct to router. My similar (year older iirc) XPS13 running Linux with same USB-C adapter gets +900mbps on same cable. Phones also seeing ~900 on WiFi.
Starting to apply driver updates, but really can't explain this one.