Tauri is great. I haven't built a proper app with the nice native backend features, but i wrote a wrapper for passing a url on the command line, which lets you run an arbitrary web app like it's a native one: https://github.com/russmatney/clove
It's going to be a lot smaller since it doesn't bundle a version of chromium in every build. Instead it uses the systems native web view. This does pose the problem of vendor specific rendering issues..
How snappy it feels is down to how the front-end programmed. It can still be a mess of bloated JavaScript 🙂
It's good if you already know a frontend framework it works nicely, I have worked with similar framework in golang as well which is wails which seems better though.
Chiming in here as well, I'm running tauri in production for a "desktop" version of our vuejs spa at a startup. The spa is rather complex business/logistics software. But in the end it hardly makes a difference what your spa does. The big pro is that you can write very system level code in rust that you can invoke from your js app. That's pretty neat if you do want to do stuff with native apis. Another massive reason for us to switch was the bundle size and memory imprint, it's a game changer for B2B customers with often lower spec hardware.
And the cherry on top is the potential mobile targets that are now in alpha...