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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.
Reposting to correct thread. 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 22H2 irrespective of NIC vendor; Intel, Realtek, etc nor brand of PC/laptop. My RBK852 is still under warranty and Netgear replaced it but the problem continues. Wiring (with replaced Cat6 cables to be sure) directly to Netgear CM2000 modem yields consistent 1Gbs download yet wired to RBK852 and running Ookla’s SpeedTest shows wired speeds being gradually throttled from 789Mbps to ~230Mbp each time no matter what LAN port on router is used. Ookla SpeedTest on router consistently runs at ~1.4Gbps download/41Mbps up. ISP is Xfinity. Netgear tried changing MTU from default 1500 to 1492 but this made no difference. Of course, multiple factory reset and NIC driver u[dates performed to no avail.