immediateRender property of from()-based tweens is one of those things you only find out about when it gives you unexpected results. The one case where it is important to change the default behavior is when you have multiple from()-based* tweens on the same property of the same object. The video below explains in detail.
In the demo below set var immediateRender:true to see the difference.
*from()-based tweens includes: from(), fromTo(), staggerFrom() and staggerFromTo() in TweenLite, TweenMax, TimelineLite and TimelineMax. The default value for
immediateRender is true.