Nessus performance with 50k hosts

I am planning to deploy Nessus as a tool for scanning a very large
network, locating the Windows hosts online, logging into these hosts
and retrieving a dozen registry keys.
The number of hosts that I expect to find in each scan is about 50000.
I am wondering how fast Nessus might be in collecting this data and
which architecture would deliver the best performance.

Thank you in advance.

Regards,

Paul
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