How to Not Screw Up UX in a Single-Page Application

If there were a Hippocratic oath for web developers, it would surely include a promise that any modification to a web page will provide a net improvement to User Experience.
And yet, there are many sites that have multi-megabyte code bundles, break native browser features like page history or make users wait too long before showing page content. Most often the root cause of these infractions is a poor or unnecessary implementation of the single-page application (SPA) architecture.

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