It’d be interesting to know if @slesar is using 20MHz or 40MHz on his 2.4GHz radio then.
If I connect to the 2.4GHz radio with my Pocophone F1 or an old laptop then it’ll get around 66Mbps or less, but if I use my PC with an Intel AX210 network card then I’ll get tripple the speed at a greater distance.
Only when I limit the 2.4GHz radio to 802.11n does my PC match my phone and laptop.
I’m doing the tests at 20MHz, since 2.4GHz is very congested in my area and I don’t want to contribute to the problem by overlapping channels.