Comment by IshKebab

Yeah you can easily get this speed down to like 100ms which is near enough to instant to not matter. You definitely don't need to go to client side rendering for most things to feel fast.

Also I couldn't see any explanation of what happens when a network request fails. That's a huge downside of local rendering.

I think for most sites the best option is still server-side rendering but use a fast backend (e.g. not Python) and lightweight frontend.