This is high standard 23AWG cable, Comparing with traditional 24awg cables, it is higher efficient as 1:1.25.
Power is the factor most effects the charging efficiency.
If output power is low, the charging is slow.
If using 2.4A or 3A current output, there will be a faster charging.
The second factor is cables.
In the condition of the same power, this cable is 30% faster than normal cable.
Peak efficiency is 146%.