alt Hacker News> It has to load HTML templates into memory and insert strings into them.
In practice, I doubt this is much slower than serializing JSON. Keeping a couple kilobytes of HTML templates in memory is nothing. Conversely, running a whole vdom on the frontend (typically more resource-constrained than the server) is a much bigger performance issue.
Three levels down and people have entirely forgotten what my post was. My "server" is some anemic ARM core built into real physical hardware with 64M of read-only storage. I don't want it spending its time "hydrating" some DOM, I don't want to bring any of this frontend insanity on there at all. No code hosted on npm shall ever run on that processor or I can't go to sleep in peace.
So how do we still get a fancy SPA website? Build it all down to a simple zip bundle, the ARM can serve those static files just fine. The SPA talks to the ARM via a few JSON APIs. Very nice clean boundary.