An adapter being a regular miniDisplay port to HDMI cable, correct? (I use an Asus PA246Q monitor).
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Most, if not all. Regardless, the bottleneck will be USB 2.0 on the laptop itself, it wouldnt make a difference to have USB 3.0 on the hub.
Uhh .. Sir, we're talking about Thunderbolt express dock here, obviously the hub IS the bottleneck if it only use USB 2.0