Right, actually building all those pages at once necessarily takes time. But on Netlify, most of my build time isn't actually used doing `next build`, it's the un-logged-to-user file transfer to their server / CDN cache invalidation / whatever hosting magic they do after the static files are built.

So at least in my case, NextJS would have to create a way to not rebuild files that haven't changed, and then the hosting/CDN provider would also need to be able to see which files those are and respond accordingly. This all seems very doable eventually though.