@stillinthe90s - like the release notes say, for now this is only supported in WebGL mode, but we're working on supporting it for CocoonJS and directCanvas as well.
@alspal - I think it's similar, yes. If you create an object not on the layout at runtime, it's not in memory, so it will load it at the time you create it. This can create a slight pause at runtime. To avoid that just make sure an instance of the object is on the layout so it loads it when the layout starts.