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How does AnyConnect client calculate its Link Speed? (Windows 7)

I'm curious about how the AnyConnect client determines what its default Link Speed is, upon initialization?  

For example, from behind my home firewall, if I have a client that's physically connected to a 1Gbps uplink, when I launch the AnyConnect client, Windows Task Manager shows me a Link Speed of 9 Mbps for my AnyConnect connection.

However, if I also launch an AnyConnect connection from another machine on my home LAN, connected via 300Mbps WiFi, Windows Task Manager will only show me around a 1 Mbps Link Speed.

How does the AnyConnect client calculate its Link Speed upon connection?   Does it take a percentage of the available upstream bandwidth?

My home ISP bandwidth is 50Mbps down/12 Mbps up.   My corporate ISP (where the ASA I'm connecting to resides) it 50Mbps bi-directional.