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I think the problem is that your USB port is not running at USB 2.0 speeds, but at USB 1.1 speeds.
Which operating system are you running? If you are on Linux then check this out: http://superuser.com/questions/431759/using-multiple-usb-webcams-in-linux
If you are running Windows then I would update the chipset drivers or something to that extent. If you are plugging them into a USB 3.0 port then make sure you install drivers for those. Many USB 3.0 controllers require specific drivers.
