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Realtek's $10 tiny 10GbE network adapter is coming to motherboards later this year
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
ISPs in Switzerland offer up to 10 or 25Gbit over fiber.
https://www.init7.net/en/internet/fiber7/
But even within a LAN it really allows using a NAS for anything, not just slow access data.