Also: these types of turns (where the steering wheel turns more than 90-degrees) are most commonly experienced at Autocrosses and Gymkana's. Those drivers who participate in big-track events rarely need to use shuffle-steering, with a few exceptions recognized, because much of the turns at big tracks carry more speed and are much broader in radius. Yes, there are a couple of exceptions to this statement(turn 2 at Streets of Willow, turn 3 at Buttonwillow, turn 9 at Autoclub speedway, etc., etc.).
What Jad says is very important: the sooner you "unwind" the steering wheel, the quicker you can be on full throttle on the exit of a turn. If you don't have to shuffle-steer, the unwinding after the apex is less time consuming and much, much smoother.
Also very important to remember: the throttle position is directly related to the steering wheel position. If the wheel is neutral (straight ahead driving) the throttle can be applied fully (depending on the length of the straight). When he wheel leaves the neutral/straight position the throttle should be adjusted off of the full position accordingly (unless, of course, your

Finally, what Ralph L. told me makes simple ... if not total sense: the straighter the wheel, the faster the travel. Getting the wheel back to straight quickly is key to adding in speed.
Just my rambling ....