Increases your skill Attack Speed.
Use items with Attack Speed bonuses to accelerate your skill/magic casting speeds.
Attack Speed can narrow down the interval of DoT skills such as Poison Arrow, allowing them to achieve more attacks
and greater damage in the same amount of time.
Cleansing Touch and similar skills (those that deliver multiple attacks while casting) attack the same number of times,
but they can do that at a faster speed, so that they can be cast more quickly.
In other words, Cleansing Touch inflicts the same amount of damage in a shorter period of time with a higher Attack Speed.