If you ever transfer large files to or from a Thunderbolt-equipped MacBook Air or Retina MacBook Pro where wired networking is available, you probably want Apple’s new Thunderbolt to Gigabit Ethernet Adapter.

New Thunderbolt adapter on top, older USB Ethernet Adapter on bottom.

I ran some speed tests with zPerf from the 15” Retina MacBook Pro to my Gigabit-wired Mac Pro:

Apple USB Ethernet Adapter: 94 Mbps (it’s a 10/100 device, and only USB 2)

(it’s a 10/100 device, and only USB 2) Wireless via 802.11n: 118 Mbps (to the newest AirPort Extreme, 15 feet away)

(to the newest AirPort Extreme, 15 feet away) Thunderbolt to Gigabit Ethernet Adapter: 941 Mbps

Nice.