Netgear R6220 - not sufficient WiFi performance
Hello, I have noticed that my Netgear R6220 doesn't achieve WiFi speeds that i see in benchmarks on the internet. Both my laptop and mobile phone get something around 250 Mbps using 5 GHz in ac. This router was tested to achieve transfers above 400 Mbps in close range, jet it is impossible for me. I tested using my SMB3 server and iperf3. What confuses me the most is that i get exactly 250 Mbps almost everywhere in the room - speed starts to drop behind the door. My laptop is able of achiving throughputs about 450 Mbps (tested with another router). I'm the only user in 5 GHz spectrum in my neighbourhood. I have disabled QoS and WMM. Testing hosts are inside LAN. I'm using up to date firmware.
Does somebody have a clue what could be the cause of speed limitation?