It seems to me that comparing Chinese ports to American ports is comparing very different things: I would imagine that the vast majority of the traffic at a Chinese port is export traffic while at an American port it’s import traffic.¹ Furthermore, thanks to centralized decision making, the interface between surface traffic and ship in China will inherently be more efficient than the same interface in the U.S. What I’m wondering is how do U.S. ports compare to, say, Europe or Canada where the situation would be more comparable.

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1. In fact, it occurs to me that loading the ship should be faster/more efficient than unloading as there’s not necessarily any reason to do any sorting beyond which ship a container goes on at the export point, while at the import point, there needs to be more direction of getting containers onto individual trucks and trains.