Hi  @keremcanb 

Is the 14mbps you mentioned the wired speed from the router or the wireless speed?

If it is the wired speed from the router, it cannot be equated with the wireless speed; generally speaking, the wireless speed of a device is lower than the wired speed.

If it is the wireless speed, have you tested the actual wired speed obtained by the range extender from the router? You can use a PC to test the same Ethernet cable to confirm the wired speed of the router. We recommend using the http://www.speedtest.net for testing speed accurately. Speedtest APP/CLI tools (https://www.speedtest.net/apps/) would be better.

  @Joseph-TP It is both wired and wireless speed of the router. If I connect to router via ethernet cable, I get 14 mbps. Also if I'm near the router and connect via Wi-fi, I get almost the same speed. But with TP-Link I get much lower. I can understand there can be some speed loss, but I think a loss of 6 mbps is too much.

  @terziyski I already configured RE as AP mode. And FW version is the latest, as you can see below.