USBExpressway, quite a mouthful, is a new technology by VIA Labs which means that when you've got multiple USB 2.0 devices plugged into a USB 3.0 hub, they will operate at full potential speed. This is realized by each device having their own port rather than sharing bandwidth.
"USB 2.0 provides 30-40MB/s of actual throughput, and this is shared across all connected devices. When multiple devices such as external hard drives, flash drives, and webcams are connected, they share available bandwidth which results in severely degraded performance. Compared to USB 2.0, USB 3.0 offers 10x more bandwidth and allows transfers as fast as 300-400MB/s. VIA Labs USB2 Expressway Dedicated Bandwidth Technology allows USB 2.0 devices to utilize USB 3.0 bandwidth, eliminating bandwidth bottlenecks and freeing each connected device to reach its maximum performance potential." - Source.
"USB 2.0 provides 30-40MB/s of actual throughput, and this is shared across all connected devices. When multiple devices such as external hard drives, flash drives, and webcams are connected, they share available bandwidth which results in severely degraded performance. Compared to USB 2.0, USB 3.0 offers 10x more bandwidth and allows transfers as fast as 300-400MB/s. VIA Labs USB2 Expressway Dedicated Bandwidth Technology allows USB 2.0 devices to utilize USB 3.0 bandwidth, eliminating bandwidth bottlenecks and freeing each connected device to reach its maximum performance potential." - Source.
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