Page speed is closely tied to, but broader than, Core Web Vitals specifically — Core Web Vitals measure particular defined moments (largest content painting, layout stability, interactivity), while overall page speed encompasses the full loading experience across every resource on the page. The most common causes of slow page speed are unoptimized or oversized images, excessive or render-blocking JavaScript and third-party scripts (ad networks, tracking pixels, chat widgets each add their own load time), inefficient server response times, and a lack of caching or a content delivery network for global visitors. Page speed matters commercially as much as it matters for SEO — well-documented industry research consistently links slower load times to higher bounce rates and lower conversion rates, independent of any search-ranking effect.
Example
A page speed audit finds three third-party scripts (a chat widget, an old analytics tag, and an unused A/B testing tool) account for 40% of total load time — removing the unused ones cuts load time by a third with zero functionality loss.
Related terms
Related Reading
404 Error
A 404 error is the standard HTTP status code returned when a requested page doesn't exist on the server — the classic 'page not found' response.
A/B Testing (SEO)
A/B testing in SEO is the practice of showing two versions of a page element — usually a title tag, meta description, or on-page element — to see which one earns a better click-through rate or ranking outcome.
AI Citation
An AI citation happens when an AI assistant like ChatGPT, Perplexity, Claude, or Gemini references or links to a specific page as the source for part of its answer.
