@Ivaylo Result from laptop

@Ivaylo After changing the settings as you suggested, this is the speed on 5G and on 2.4Ghz it's 2 Mbps. Here is the link speed you requested

I bought an Archer C6 around June 2020 to support my 150 Mbps connection from Act Fibrenet because my old router only supported till 100 Mbps. As soon as I setup the router, I did a speedtest (by...