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What about using an iframe and refreshing it with links targeting it ? Use <link rel="preload" ...> to make it really fast. Do so for any subcomponent of your page that can be updated independently of the rest of the page. Use browser caching for code assets/dependencies.

Pros: cheap & fast (?)

Cons: obviously the logical structure of your app must (somehow) follow the structure of nested iframes in the page.

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I think iframes are inferior to the JS approach for a few reasons, one is usability for people with screen readers / etc - others would be standards compliance, bookmarking, managing state when pieces do need to talk to each other, etc.

IFrames create security obstacles, additional requests, take up memory, share CPU threads, and are usually the wrong size.

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