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As someone who has audited many, many sites for performance and usability, React sites have long been a major outlier. The fragile, client-dependent patterns that the tooling encouraged early-on may not be the chosen path for folks in the know anymore, but they made a lasting impact and continue to be visible in the most popular sites on the web.

Most of the sites in this audit I did for WPT were that slow **because of** the React delivery patterns they used. https://blog.webpagetest.org/posts/will-html-content-make-site-faster/