Karolina Szczur avatar Karolina Szczur

Lighthouse changes how Performance Score is calculated

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Lighthouse 6 is the first major release of the popular auditing tool since May 2019, introducing critical changes that will impact everyone relying on the scoring. Remember, the PageSpeed Score (which contributes to your SEO ranking) is the same as the Lighthouse Performance Score.


No matter how you are using Lighthouse, whether it’s one-off tests or any continuous performance testing tool, your Performance Score will change.

  1. Same page tested on PageSpeed Insights over a few hours the same day, without anything modified, and the desktop scores vary from 19 to 59… 🤷‍♂️

    A lot of businesses rely on this crap to now if their site is "fast" enough for Google SEO! 😭

    Three different scores: 44, 59, 19