How to remove flicker when transitioning between layers

Hi - I have several slides that have 4-5 layers, with shapes moving around to different places on different layers.  Some shapes remain stationary between layers, but the screen flickers so that they seem to disappear and appear again when switching layers.  Is there any way to stop that, other than putting each layer on its own slide?  The shapes that stay are variable, so it can't be a slide master or putting them on the base layer.

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