A:Answer This unfortunately is a dual channel Thunderbolt 3 setup, so it will support 20Gbps. This will give slightly weaker performance if using it with an external GPU, and to date, will not allow you to run dual 4k displays. For just about everything else though, it shouldn't cause a big difference if any.
Also note that the USB-C port does NOT support PowerDelivery, so you cannot charge the laptop via USB-C.