Drawing just the “shape” with the handles is just an overlay, on the top of all the layers, without to touch anything under.
It doesn’t cost anything, no calculation is done.
But if you move your shape in a layer placed in the middle of the stack of layers, you will have (at least) to recompose every layer above this one, at anytime you will move even of a single pixel.
It would be ok for a few layers in your scene, but when you have a few hundreds you will be able to go and take a coffee before the workarea to be refreshed
If you want more accurate placement with visualisation of the “shape” in the composition, you can still move pixel by pixel with the keyboard, it will refresh the scene everytime.