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Solved
Wired ethernet speed slow
I am having the same problem. It seems to have begun 2 weeks ago in my case when Windows11upgraded to 22H2. It is only affected wired ports. WiFi unaffected. It is affecting every PC upgraded to 22H...
Had a network tech friend bring his Asus GT AX-11000 to test in my home and we experienced the ethernet throttling the same even with the Asus. He then turned off IPV6 on my NICs properties, rebooted, retested and problem is resolved. I now have full ~920Mbps download on a 1GbE NIC as expected from using either the Asus or the RBK852 simply using IPV4. Circumvention is to turn of IPV6 in NIC properties.
Windows reimage was done but it immediately upgraded to 22H2. Problem occurs on all PC's/laptops. 4 different ones have been tried. The speedtests downloads all initiate at ~800Mbps and during the speedtest throttle down to ~300Mbps or less. See previously provided youtube
And all PCs have this same version of Windows?
yes. The latest Windows 11 22H2 build 22621.675