Or put another way, the pipe coming in to the Hub 4 is about 17% bigger than each individual ethernet "pipe" out (eg to your main PC, or your own router or mesh), and 90% bigger than the virtual wifi pipe to a single device.
You can have multiple pipes out and those can (in theory) add up to the total incoming pipe size, but you'd need to do concurrent speed tests across all devices and add the resulting speeds together to see around 1,100 Mbps (as well as adjusting for any TCP/IP overheads and router efficiency).
So ignoring the overheads, if you had a wireless device at 600 mbps, then you could have two ethernet connections running at 250 each (or four at 125 Mbps). Or any other permutation that adds up to 1,100 from ethernet connections individually up to around 930 Mbps and wifi devices up to around 600. But you'll never be able to measure 1,100 Mbps on a single device with the Hub 4.
It was really a big bit daft of VM to launch the Hub 4 without at least one 2.5 Gbps ethernet port and Wifi 6, but you're living proof that people will still buy the offer as it stands.
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