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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 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.
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.
47 Replies
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.
CAT6 A STP is recommended between the RBR and CM modem.
Is this the only device that your seeing this with? Does this happen on other PCs or different windows versions?
What is the brand and model of the ethernet adapter with in the PC?
Ensure the ethernet adapter drivers are up to date.
Disable any ethernet adapter built in QoS features if it supports it.
Swap ethernet adapters to compare results
What is the size of your home? Sq Ft?
What is the distance between the router and 📡 satellite(s)? 30 feet or more is recommended in between RBR and RBS📡 to begin with depending upon building materials when wirelessly connected.
https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite 📡Any of the following enabled?:
Armor, Circle, Traffic MeterHas a power off for 1 minute then back ON with the ISP modem and router been performed since last update?
Be sure to restart your network in this sequence:
Turn off and unplug modem.
Turn off router and computers.
Plug in and turn on modem. Wait 2 minutes for it to connect.
Turn on the router and wait 2 minutes for it to connect.
Turn on computers and rest of network.Has a factory reset and setup from scratch been performed since last FW update?
My previous post did not make it for some reason. All of what you mention has been verified and done ad nauseum. Tests with Netgear support were extensive. NICS are Intel, Killer and Realtek. Results on each NIC the same when connected to RBR. Satellite not part of problem. Wifi speeds unaffected Problem is only with the (4) 1GbE LAN ports on RBR850. All NICS test full link speed when directly connected to Netgear CM2000 modem port. All cables confirmed in spec and are recent. No parental controls and Armor was tested with and without and made no difference, RBR Speedtest below and video showing NIC throttling with Speedtest is at https://www.youtube.com/shorts/5_82G_0I3jQ
So after the reset and setup from scratch the speed is good for a while then drops to a lower result?
Is the CAT6 cable between the Modem and RBR a CAT6A STP?
Are you testing different speed test servers on Ooklas speed test app to compare?
How many devices are connected entirely to the RBR?
Are you speed testing while other devices are online or just a wired PC?
FYI, Killer nics have there own QOS that can cause problems though if you tested with other nics, kinda doubt a nic problem. You should be seeing near 900Mpbs or just over all the time on the LAN ports.
What Firmware version is currently loaded?
WRSORBI wrote:
when Windows11upgraded to 22H2.
Just a random question: Have you tried rolling back one of the Windows systems to before the 22H2 upgrade?
WRSORBI wrote:
wired to RBK852 and running Ookla’s SpeedTest shows wired speeds being gradually throttled from 789Mbps to ~230Mbp
The way I read this, when Ookla Speed Test is run repeatedly on one PC, the reported results fall from something close to 800MB/s, with each result being less than the previous result, until finally reaching just over 200MB/s, where it remains? i.e. a constant progression?
After one PC has gone through this, what happens when another PC does the same thing? Does it begin high and gradually decrease?
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?
