Update: It's Hyper-V's virtual switch. I run some VMs and this card was used to get VMs online. Guess I need to find a different VM host - I've never been able to get Microsoft to fix bugs in Win10 or Win11 Hyper-V. Why would an Intel (10GBe) and a Realtek (2.5) card have wildly different performance, but only on the Internet, not the LAN? Same speedtest servers, Intel gets 1300 megabit down, Realtek gets 2000+ Router with Aquantia NIC gets 2000+ using Speedtest-CLI Will need to boot this machine into Linux soon. #AskFedi #Networking