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How does site speed affect SEO?

Short answer

Speed affects SEO a little and leads a lot. Google's ranking systems use Core Web Vitals, which measure loading speed and responsiveness, but relevance still comes first. Slow pages lose visitors before they ever see your offer. On a phone, every extra second of waiting makes a caller more likely to try a competitor.

In this answer
  1. 01How speed fits into ranking
  2. 02Where speed really pays
  3. 03The usual causes of a slow site
  4. 04How to find and fix the slow parts

How speed fits into ranking

Google measures speed through Core Web Vitals and uses them in its ranking systems. It also says it will show the most relevant page even when that page is slow. So speed rarely lifts a weak page past a strong one. It decides between pages that answer the search equally well.

Where speed really pays

Speed shapes what happens after the click. A visitor who waits on a blank screen goes back to the results and taps the next business. That lost visitor never shows up as a lost lead in any report, which is why slow sites quietly underperform.

Good example. A pest control site loads its service page in under two seconds on a phone. The tap-to-call button appears with the first screen.

Bad example. The same page loads a video background, three tracking scripts and a chat widget before the phone number shows up.

The usual causes of a slow site

  • Images uploaded at full camera size
  • Page builders that load code for every feature
  • Too many plugins, widgets and tracking tags
  • Cheap shared hosting with slow server responses
  • Web fonts and scripts that block the first paint

How to find and fix the slow parts

Run your main pages through PageSpeed Insights. Look at the Core Web Vitals first, then the list of opportunities. Fix the template behind your service pages, not one page at a time, because one fix then speeds up every page using it.

Compress and resize images and remove unused plugins. Delay scripts the first screen does not need, and move to better hosting if the server responds slowly.

Our sites score 100 on Lighthouse for mobile, and we build every client site to the same target. See Core Web Vitals for the metrics, or ask our web design team to speed up yours.

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