Try rebooting the router, you did not state whether you had tried that yet, and disable the WiFi adapter in Device Manager. Then try again. Also if the router is connected to a modem, reboot the modem. I get all kinds of strange speeds at times through the modem until I reboot it.
Morning peeps - my laptop is only getting to about 11Mbps on ethernet, which is (exactly) the same as my WiFi. I've tried the cat5e cable & a USB/ethernet adapter and both result in the same. (The adapter indicator shows it's at full speed (green) and in Device Manager, the ethernet speed is 1Gbps, as it should be. I've tried three ethernet connections, one directly on the router. (I also have used several cables.) What should I do? Cheers, Chris
Inspiron 7746 - Ethernet same speed as WiFi (around 11Mbps)