@Liverpool20 thanks for the replay. Negotiation speed is set at 1000 mbps. I am using Wi-Fi. I am not using Lan although even when using Lan, I am getting speeds of 10 mbps. I have done all steps...

As described, When connected directly to ISP, I get speeds of 500 MBPS approx. When connected to Router WIFI, I get only 9+ MBPS. This is the same case, when I connect to WIFI LAN PORT through cable...