[property set from css will get gsap performance?]

hello, thanks for this awesome GSAP

 

i have one question, a simple code as below

    var tl = new TimelineLite();
    TweenMax.set($a, {autoAlpha: 0, display: 'none', top: 100});
    tl.staggerTo($a, 1, {autoAlpha: 1, top: 0, display: ''}, 0.2);
    tl.play();

staggerFrom seem better for my code but i cant get it work, i will try again late

 

so now i set the $a property by TweenMax first.

 

if i set the property by css file not by TweenMax, and then play with TimelineLite, will i get the nice performance from gsap too?

 

e.g set translate, opacity, z-index, scale etc

 

any different between set property from css / TweenMax? which one is better?

 

sorry for my language skill, thanks so much