Tilt Brush is comparable in that it has it need to work as ypu propose internally. And all it has to do is fill relatively small vertey buffers with geometry,

Tilt Brush is comparable in that it has it need to work as ypu propose internally. And all it has to do is fill relatively small vertey buffers with geometry, yet it takes forever to load a file. I am not going to create a full model to estimate memory usage and of the different designs. It is however clear that a nondestructive approach is more computationally heavy in principle because it will always rerun the same operations more often than a destructive one. And all these times do add up. An operation that takes 100ms after a click or keypress is perceived as practically instant. But 100 of these take 10 seconds. And there are operations in Photoshop that a lot longer than that.