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A comment on Newest MacBook Pro is the first MacBook not recommended by Consumer Reports. Parent comment

Re:Newest MacBook Pro is the first MacBook not recommended b... by Osiris on Friday December 23, 2016 @03:20PM (#13247007)
I read that the 2 ports on the left and right are actually slightly different. I don't recall exactly what it was but I think it was something about Thunderbolt 3 because of a lack of sufficient PCI-E lanes for all four ports.
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Re:Newest MacBook Pro is the first MacBook not recommended b... by manarth on Friday December 23, 2016 @06:27PM (#13247794)
Official Apple comment:

  The two right-hand ports deliver Thunderbolt 3 functionality, but have reduced PCI Express bandwidth [1]
The full Thunderbolt 3 speed is 40MBPs (use the left-side ports to achieve that).

I can't find any official document which clearly states the speed of the reduced-functionality ports, but Apple also state this:

  All late-2016 MacBook Pro models deliver USB 3.1 Gen 2 (10 Gbps) performance on all Thunderbolt 3 ports [1]
So there may be a 4x speed differential, depending which port you plug into.

[1] https://support.apple.com/en-us/HT207256

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