You don't need to wait for the CPU time of all components to complete before the first bytes are available. When we render an HTML element, we now emit the open

You don't need to wait for the CPU time of all components to complete before the first bytes are available. When we render an HTML element, we now emit the opening tag before processing the children. People have seen benefits in practice from this. Our new architecture makes it easier to implement the type of async data fetching you describe and we'd like to add it in the future.