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It's a pure wifi thing here, since the wired port on AP can do max speed. Depending on both AP and client wireless NIC, a maximum speed will be determined.

For instant, 802.11g will be slower than 802.11n/ac.

For myself, once upgraded to wifi 6E, I can pull 500Mbps+ easily on a Pixel 6 phone.

Try this and see if it helps...
Interfaces -> WAN -> IPv6 Configuration Type: None