This doesn’t help with speed over a laptop with DisplayPort and USB3. All it does combine cables, which as I noted even Apple gave up when it doesn’t give any other advantages.
Apple Display Connector > Lightning Bolt
USB > USB 3
DVI > DisplayPort
Power > Power
Same thing, just a newer generation.
Thunderbolt, now that removes your speed limitation. You can even hook up an external graphics card. In addition, you aren’t limited to the inefficiencies of the USB protocol. Theoretically, you get about 60% of that 5 Gb/s raw rate; realistically, even lower.