Hello @Clive_A - Since my issue has been resolved by using the latest router firmware and NIC drivers, I don't have any reason to investigate any more. Everything is good with my setup now. Thanks...

@Clive_A - any update on a fix for my issue? Hello @Clive_A ! Great news! I wanted to give you an update. I updated to the latest ER707-M2 firmware and also upgraded my Realtek 2.5G network adapters...

@Clive_A Thank you! I did some more testing that may be helpful. I tried switching the cable modems between the two WAN ports: I put the Netgear CM2050V Xfinity modem (faster 1000mbps, primary...

@Clive_A Hello Again- Below is a video with the different information you requested. I am not sure if the iperf run I did is exactly what you are looking for. Could you take a look and let me know?...

Here is a video with the different information you requested. I am not sure if the iperf run I did is exactly what you are looking for. https://youtu.be/QtVfmzMTulM

@Clive_A Hello- The slow downs occur with only one client downloading something from the primary WAN and one client downloading on the backup WAN. What is the point of doing iperf? Also, I monitored...