Hi all, and thank you all for your responses.
Sorry for not responding quickly. I have done a lot of test using TweenMax...
I think you are right, the example I give is ok, there is no "lag" in it, but, sometimes, randomly, there is a little break... It is really more visible using fullpage background.
And you are right, there is better result using X and Y position instead of top/left...
To don't have the problem with some little breaks in the animation, I'm creating an animation controlling by scroll, this don't solve the problem but I think it's a better experience for the user Did you have any advice for this kind of navigation ?
I have one week to finish my project, I will post the result here (is it ok with the forum rules ?)
Thanks for working on this great library and for the support.
Moutz
(and please excuse my english )