@Kevin_Z Thanks for replay, Yes tested with only one laptop and disconnected all device from wifi connection. Through wifi tested speed using https://speedtest.net. link. But with direct LAN cable...

TL-WR841N Model router am using, I have 75Mbps speed internet connection. But only 35Mbps speed coming. I tested with direct LAN cable then am getting around 80Mbps speed. Through LAN cable from wifi...