October 31, 2023  SEONews
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Answering Common Questions About Interpreting Page Speed Reports — Smashing Magazine


Have you noticed that different tools’ reports result in different performance scores? Shouldn’t they be the same if reports rely on the same underlying tooling to generate scores? Take a closer look at how various performance tools audit and report on performance metrics, such as core web vitals. Geoff Graham answers a set of common questions that pop up during performance audits.

Running a performance check on your site isn’t too terribly difficult. It may even be something you do regularly with Lighthouse in Chrome DevTools, where testing is freely available and produces a very attractive-looking report.

Lighthouse is only one performance auditing tool out of many. The convenience of having it tucked into Chrome DevTools is what makes it an easy go-to for many developers.

But do you know how Lighthouse calculates performance metrics like First Contentful Paint (FCP), Total Blocking Time (TBT), and Cumulative Layout Shift (CLS)? There’s a handy calculator linked up in the report summary that lets you adjust performance values to see how they impact the overall score. Still, there’s nothing in there to tell us about the data Lighthouse is using to evaluate metrics. The linked-up explainer provides more details, from how scores are weighted to why scores may fluctuate between test runs.

Why do we need Lighthouse at all when Google also offers similar reports in PageSpeed Insights (PSI)? The truth is that the two tools were fairly distinct until PSI was updated in 2018...



source: https://news.oneseocompany.com/2023/10/31/answering-common-questions-about-interpreting-page-speed-reports-smashing-magazine_2023103152007.html

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