Drag & Drop not smooth

I created a (bit complex) Drag & Drop project. It builds up on quite a few images. Now, when I preview it in Storyline it runs perfectly fine. After I uploaded it to Articulate Review it isn't as smooth as it should be. It is perfectly fine until you drag it above a target - than dragging jiggles and "feels" slow.

Is that only on Review? What can I do to make it run smoother? I used PNGs, because I need transparency. I did however use quite large images (thought they would be compressed anyway - if that could be the reason, is there a way to swap images without having to resize and reposition each of them?)

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