Question: is 10 watts fast charging?
Answer: A 10W charger is fast as 5W charger. But it all depends on the device that you are charging. For example, Apple iPad 9.7″ 5th gen Comes with a 10W charger inside the box, but for the same iPad if you use a 5W Apple Charger it will charge the device at half the rate at which the 10W charger does charge.