@woozle Thank you! It is the problem of "QoS", the speedtest reaches ~2500 Mbps for download and ~4750 Mbps for upload when I turn the QoS off. Thank you very much for helping me to resolve the...

@woozle Thank you for your reply. My model of Modem is: Huawei OptiXstar HN8250Ts-20 XGS-PON Terminal I have tested the internet speed with the router and got 5 Gbps. Also, I got 5 Gbps when I...

@terziyski Thank you for your reply. My GE550 ethernet status / port negotiated speeds: Let me know if you want to know more about my GE550 configuration. Thanks!

I upgraded my internet to 5Gbps and got an Archer GE550 V2. I also bought TP-Link TX401 to upgrade my PC to ensure 5Gbps can be supported. I can got ~4870 Mbps in the speedtest when I connected my...