I think Progressive Web Apps should help with this. The architecture there designates that you have an app shell that's only downloaded once - this should be yo

I think Progressive Web Apps should help with this. The architecture there designates that you have an app shell that's only downloaded once - this should be your SPA framework and all the layout bits and blobs. Those get cached at the service worker layer. Everything else (i.e. the actual data that gets displayed) can be cached as needed or retrieved as needed, without having to redownload all the "app shell" bits.