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Possible needs to be USB3 though to get the chance of full speed as with all these things YMMV or will definitely vary.
 
depends on which ethernet adapter you get. Some support 1000BaseT, others are limited to 100BaseT.

A link to the product you were considering may help clarify matters.
 
With USB 3 you will but with usb2 you will not
There's always the possibility that someone will design a 100 baseT device for USB 3.0. Really, you need both USB 3.0 (Superspeed) and 1000BaseT-- and you'll need to look at the specs to determine if either has been overlooked.
 
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I got an Anker USB 3.0 Gigabit one from Amazon, which has the bonus of a 3 port USB 3.0 hub. It's hardly any slower than the Apple Thunderbolt to Ethernet adaptor, and then you'd have to peer at benchmark graphs to notice.
 
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