I don't have any hard data. But it seems to charge faster than with standard USB 2.0 cable. J
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From what I understood, the charging faster only worked when you plugged the phone into a computer's USB port. This is because the USB 2.0 standard would output 500 ma on a computer's USB port while the USB 3.0 standard outputs 900 ma. That's still slower than the DC output of the charger plug, which is supposed to be 2 amps. Perhaps it only outputs 2 amps using the USB 3.0 cord, while it outputs 1 amp using a USB 2.0 cord?