Western SEO Specialist David Previti spent a small study correlations of page performance (Lighthouse Performance Score) and changes in page visibility in the middle of the Google July 2021 Core Update. The author of the study wanted to see how the pages of different sites coped with the algorithm update.

As a result, the “slowest” pages with a score below 25 decreased their visibility by 14%. Other groups showed no particular dynamics.


The sample for the study included 100,000 URLs from 7,000 domains. Visibility was tracked for 36 thousand requests. He parsed the Lighthouse Performance Score with the Screaming Frog program via the Page Speed ​​Insights API.

Output: as before, you don’t have to be the fastest. Now it’s even more important not to be the slowest.

A source: SEO without water


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