ASUS RT-AX53U slow wifi on WPA3

Is the CPU bottlenecking here? Otherwise on WPA2 I get 600Mbps. But with WPA3 barely 100Mbps.

Not possible, wpa3 uses same crypto as wpa2 after new key exchange.
What is in ubus call system board ? ie 23.05.5 or better at least?
Can you post /etc/config/wireless segments for 2 access points?
Literarily mine, just made 600Mbps speed run:

        option device 'radio1'
        option network 'lan'
        option mode 'ap'
        option ssid '---'
        option encryption 'sae'
        option macaddr 'random'
        option key '---'

and

        option device 'radio1'
        option mode 'ap'
        option ssid '---'
        option encryption 'psk2+ccmp'
        option macaddr 'random'
        option key '---'
        option ieee80211w '1'

If you want more than 500-600Mbps you need at least soft offload with either wifi protocol. Also check firewall4 git, first head release takes off some brakes, and walk through my PR-s.

I have Software and Hardware offloading enabled both. But wifi offloading? Where do I sign up for that?

It is called WED (search wiki)

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Ok thanks, I search wifi offloading nothing came up.

https://openwrt.org/toh/linksys/e8450#wireless_ethernet_dispatch_wed_hw_acceleration_for_wireless_clients