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Core Web Vitals for Search Engine Optimisation: What Do We Need to Know?

CSS Wizardry

Google’s Core Web Vitals initiative was launched in May of 2020 and, since then, its role in Search has morphed and evolved as roll-outs have been made and feedback has been received. However, to this day, messaging from Google can seem somewhat unclear and, in places, even contradictory. Don’t have time to read 5,500+ words?

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Answering Common Questions About Interpreting Page Speed Reports

Smashing Magazine

But do you know how Lighthouse calculates performance metrics like First Contentful Paint (FCP), Total Blocking Time (TBT), and Cumulative Layout Shift (CLS)? Still, there’s nothing in there to tell us about the data Lighthouse is using to evaluate metrics. But it comes with caveats. So why use lab data at all?

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How to use Server Timing to get backend transparency from your CDN

Speed Curve

However, that pesky 20% on the back end can have a big impact on downstream metrics like First Contentful Paint (FCP), Largest Contentful Paint (LCP), and any other 'loading' metric you can think of. Google recommends that TTFB be 800ms at the 75th percentile. That performance golden rule still holds true today.

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Fostering a Web Performance Culture

Jos

Google’s Lighthouse is one of them, which shows information about PWA, SEO and more. presented in Google IO 2018 ( source ) These tools make it easier to determine where we need to put emphasis to improve our sites. One could argue this is a metric-driven decision. A screenshot of Lighthouse 3.0, Well, not so fast.

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Front-End Performance Checklist 2021

Smashing Magazine

LogRocket tracks key metrics, incl. Getting Ready: Planning And Metrics Performance culture, Core Web Vitals, performance profiles, CrUX, Lighthouse, FID, TTI, CLS, devices. Assets Optimizations Brotli, AVIF, WebP, responsive images, AV1, adaptive media loding, video compression, web fonts, Google fonts. Table Of Contents.

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Fostering a Web Performance Culture

Jos

Google’s Lighthouse is one of them, which shows information about PWA, SEO and more. presented in Google IO 2018 ( source ). One could argue this is a metric-driven decision. Again, it’s easy to fake performance optimization by leaving out the bad metrics, blocking users who spoil the stats. Well, not so fast.

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The Performance Inequality Gap, 2021

Alex Russell

The scale of the effect can be deeply situational or hard to suss out without solid metrics. Since then, the metrics conversation has moved forward significantly, culminating in Core Web Vitals , reported via the Chrome User Experience Report to reflect the real-world experiences of users. Baselines And Budgets Remain Vital.