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Optimizely injected artificial latency into The Telegraph's website and measured the destruction. At four seconds of added delay, page views dropped 11%. At twenty seconds, the number hit 44%.
Google's rendering pipeline, as of December 2025, silently excludes any page returning a non-200 HTTP status code from being rendered. No crawl, no index, no second chance. A page built with client-side JavaScript that shows users a friendly "out of stock" message on a 404? Googlebot never sees it.
Only 43.4% of websites pass all three mobile Core Web Vitals thresholds. Desktop? 54.6%. That gap tells you everything about where ranking problems actually live.