New answers tagged tweening
It seems that for TweenJS, there is no performance penalty in tweening multiple image objects. After contacting CreateJs support, i got extra information on how to do it. You can group multiple images (createjs.Bitmap objects) using a createjs.Container, and the only performance penalty is the creation of the container object it self. Hope this helped ...
One way you can do this is to draw all the images where you want them onto a new canvas (one which is separate from the main canvas, but positioned absolutely exactly on top of the main canvas). Then you can tween the entire canvas element (not the images on the canvas), keeping the images that were drawn on it as one.
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