How it achieves the 450Mb per user on 5Ghz 802.11ac where 20+ users are connecting.
You can't achieve such throughput per user. What is the AP model you use.
Even it is 11ac capable AP, total throughput ~600Mbps for the whole AP. So all clients connect to that AP has to share it.
When there is 1 client on that AP, that is the highest throughput a client can achieve.
HTH
Rasika
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