Windows 11, at a software level, should certainly support WPA3. But it is possible that there is an issue with your wifi hardware in that device. I don't really know. Try WPA2 and see if that works. You may also need to see if Windows can "forget" the SSID and password so that you can re-enter it. If the problem persists, it's probably worth a new thread to figure out the problem with your WPA3 connection.
Meanwhile... on this specific topic (wifi speed), I think we agree that there wasn't really an issue:
And with that in mind...
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Thanks! 