The only way to do it quick, fast, quiet and the cock feather the way you want it to be is practice.
Set your self up a timer, set it for 20 sec, when you can get off 5 shots, put them where you want them and not fumble with tring to nock an arrow then you got it.
This not only helps you get a second shot off quick but is loads of fun.
With speed shooting 4 fletch is the way to go or train youself not to worry about how the cock feather lands,(with a tuned bow it does not matter)
Once you get there then do what smokin joe said, "silent movement might be more important than speed in some cases"