In some situations it's not necessary to calculate bounding boxes. For example, if the canvas has a fixed size then there's no need to calculate a bounding box for the entire Picture (though a bounding box may be needed to layout nested Pictures). Removing calculating the bounding box could speed up rendering.
Bounding boxes, and the conversion to the backend's specific representation, can be cached. This will be more useful when interactivity / animation is improved.
In some situations it's not necessary to calculate bounding boxes. For example, if the canvas has a fixed size then there's no need to calculate a bounding box for the entire
Picture(though a bounding box may be needed to layout nestedPictures). Removing calculating the bounding box could speed up rendering.Bounding boxes, and the conversion to the backend's specific representation, can be cached. This will be more useful when interactivity / animation is improved.