Hello
This topic may only be Hunter specific.
I am getting massive sound delay and I am pretty sure its down to Aimed Shot and I am maybe 90% sure that it only started after I unlocked the Precise shots passive ability in my spell book!
I have been in contact with Tech Support at Blizzard and on the phone to them for an hour and they could not find the problem either. They don’t think its down to my PC either, which is also brand new and I have had no such issues with other games.
If someone is experiencing the same issue or knows of a fix (even better) please let me know, its making the game almost unplayable as a Hunter sadly 
I will also leave a YouTube link here so you can hear for yourselves what I am talking about. Play it from 20 seconds onward and you can hear the sound repeating a few times. This sound can literally go on for 20 seconds at a time.
The problem was Nvidia’s audio driver, which I have removed, now fixed 