Originally Posted by Glaurong

Sunfury with quiver and SS fires at 2.1

Steady with quiver and SS fires at 1.08

This means you could do the following:

0.0 cast steady (global cool tic)
1.1 steady fires
1.5 arcane fires (global cool tic)
1.6 auto begins hidden cast
2.1 auto fires
3.0 cast steady (global cool tic)
4.1 steady fires
4.1 auto begins hidden cast
4.6 auto fires (delayed by 0.4 seconds)

Repeat this slotting specials in as possible. You will delay every second or third auto shot by about 0.4 seconds but overall it will net you a pretty significant bump in dps.

It is pretty intuitive to understand, delay every other auto shot by 0.4 seconds, or suffer with 0.6 seconds of dead time.