I have a late 2013 15" rMBP. I usually connect wireless to a 2013 Time Capsule (5GHz ac). Occasionally, I want/need to connect via a wired connection. Currently, I have a USB 3.0 multi-port hub that also has Gigabit Ethernet, with a CAT 6 cable to the Time Capsule. The hub is connected to a USB 3 port of the rMBP (I've turned the wireless off to verify the ethernet connection is working). My question: Would I get more transfer speed by connecting the CAT 6 cable directly to the rMBP (using the Apple Ethernet adapter, given the elimination of the ethernet port on the rMBP)? My first thought is I wouldn't think so, given that USB 3.0 is (theoretically) 5 Gbps and GigE is 1 Gbps -- but I'm wondering whether any "translation" or other delay resulting from the hub being in the path is slowing transfers to the point that a direct connection is preferable. p.s. -- As I finished typing the above, it dawned on me: Is the Time Capsule's LAN connection the real transfer limitation? In other words, even with the Time Capsule's ethernet ports being "spec'd" as 1 Gbps, do they actually deliver 1 Gbps between LAN ports when transferring files from one computer to another over CAT 6 cables that meet at the Time Capsule?