Playing with some super slow internet today (~256kbits/sec). One thing that it's making clear is how abysmal we are at caching the parts of web pages that never change. Ironically, modern web apps should be better than old style static HTML in this way: we can download only the content, not the fancy page structure, and cache the rest. But that's definitely not what happens. (Once a web app finally loads, navigating around in it was fairly tolerable.)
Mobile apps feel vastly quicker, mainly because they're already downloaded. But... so are web apps that I use all the time! If we care about the web ecosystem, maybe just the caching part could use more work.