Here, let me blow your mind. It's in Czech, but you can click the orange buttons to try the activites: https://gramazing.com/features .
Made with NextJS (client side only), Django, hosted in Germany on a cheap VPS.
Statically generated site is something completely different and I couldn't make Gramazing like that.
The problem was: can we make the same data APIs to serve the web and mobile apps?
To be honest, server side rendering is always the king regard of performance. A properly optimized static html generator can make you see the page under 0.5s after you click the link even under most awful network. And it isn't even enough for most spa to download the javascript alone (it will at least need 3 rtt to see basic layouts, one time html, one time js, the js load the images and style)
I'm sorry but I have to disagree. I've never seen a fast or responsive SPA, not to mention the absurd amounts of resources they require. A tab taking up 400 mb of memory is pure insanity and this is the de facto standard these days. Look at HN: this is the definition of fast and responsive. It will work equally well on my dual-xeon workstation and a first gen raspberry pi zero. This is fast and responsive. Most people who use a computer to navigate the internet would not care if the browser blinks when you navigate a page. Mobile users don't really use the web beyond social media and chats so it makes no difference to them either. SPAs solved a problem no one had by creating 1000 other problems. Just take us back to server side html rendering and I guarantee most ordinary people as well as most developers will love it.