T-Mobile 5G Home Internet Gateway slow ethernet but fast WiFi

I figured it out, guess reading here put a bias in me that it was somehow the gateway’s issue if WiFi’s fast but Ethernet’s slow… it was my fault lol, if you’re having the same issues perform the following steps before bugging tech support --

1. Uso https://www.speedtest.net/ and set the same server for testing, do NOT use Google’s M-Lab that comes up in a blurb when you search speed test (it’s highly inconsistent)
    
2. Run speed test via another browser to see if you get the same results, if you’re getting discrepancies it may be VPN / secure DNS, etc. Make sure your VPN software isn’t running, if on Windows check Internet Options → Connections and make sure there’s no VPNs that’s slowing you down
    
3. Check another device and a third device via Ethernet, if you’re getting discrepancies it’s not the gateway’s problem 
    
4. Uninstall your NIC driver and update to the latest, for me it was https://www.realtek.com/en/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-pci-express-software
    
5. Perform a “Network Reset” under System Settings, just type in your search bar
    
6. Worst case if you have a PC that’s still just not performing, buy a new $13 NIC card on Amazon

Now I’m getting 200-400 Mbps on all devices with my old router, a bit inconsistent but beats 4G speeds by a long shot!