It's actually pretty common for single-page apps to have a large amount of configuration data (e.g. all the client-side routes) and potentially a large of amount of application data sent from the server-side renderer. And code compilation can be a significant part of the cold-boot time for large single-page apps. I haven't verified, but it's very conceivable that this would significantly speed up time-to-interactivity for a very large single-page app.