@Joseph-TP There is probably problem with pppoe in case of using powerful wifi. In config: ONT -> ISP router -> be550 in ap mode I can get full ISP speed like on eth even using wifi 6ghz 320MHz.

@Joseph-TP I did more tests and when I tested client with ax210 network card I had 1.4Gbps download (not issue, that is expected speed) and 600Mbps upload - that was wifi 6e but with 160Mhz...