In general the database queries themselves are the most expensive. That and maybe the ActivityPub messages. The HTML/Javascript content from the browser should be nothing in comparison, especially since it's static. So in the end, it shouldn't matter if you're using a mobile client or a browser, assuming both are optimized.
I haven't looked at the code for either the web-UI nor Jebora, so I can't say if either are written optimally. In theory they should be comparable at least because they are written by the same developers, but who knows...
But that's interesting, for myself on Jebora, it's slow as molasses. I constantly get network timeouts and JSON errors. On the browser it at least feels smooth, just longer load times.
Nope. The web ui uses something called service worker which caches the html, css and js files on your device and only fetches updates from time to time.
Possibly? No idea how much of the data is from service worker cache. Also I'm not sure whether clearing the cache really skips service worker's cache, my gut feeling would be that it's purged as well.
Would be nice if Apollo would become open-source and then we could modify it to work with the fediverse. Maybe we could have a crowdfunding to pay back Christian's work and make it opensource.
Christian isn't interested. Only person I've heard about is the person from Sync. They're making Sync For Lemmy. I'm trying a bunch so idk yet. Connect, Liftoff, Jerboa are a few. Look up WefWef. It's a site app that looks like Apollo. Wefwef.app