What does Google say about SEO? /
Web performance has become an official ranking factor in Google's algorithm, particularly since the introduction of Core Web Vitals in 2020. This category compiles all official Google statements regarding loading speed optimization, performance metrics, and their impact on organic search rankings. SEO professionals will find Google's positions on key indicators such as Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), First Input Delay (FID), and Interaction to Next Paint (INP). Google regularly communicates about the importance of loading times, Time to First Byte (TTFB), cache optimization, and techniques like lazy loading. These official declarations help understand how Google truly measures user experience, which performance thresholds to prioritize, and how PageSpeed Insights integrates into a site's overall evaluation. For search practitioners, following Google's official recommendations on web performance is crucial to maintain or improve search rankings while delivering an optimal user experience that enhances conversion rates and visitor retention. Understanding Google's evolving stance on speed metrics enables webmasters to align technical optimizations with actual ranking signals rather than assumptions or outdated practices.
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★★★ Is Lazy Loading and Responsive Images the Real Key to Core Web Vitals or Just Google's Generic Advice?
Images are often the largest contributor to the overall page size. Google recommends optimizing images by using lazy loading and responsive image techniques to provide fast, high-quality user experien...
John Mueller Feb 10, 2021
★★★ Do Google's Core Web Vitals Really Apply the Same Way to All Types of Websites?
John Mueller also explained on Twitter that as part of the "Page Experience" project, the Core Web Vitals KPIs, which will be implemented in May, will be the same regardless of the type of site. Thus,...
John Mueller Feb 08, 2021
★★★ Is the text/HTML ratio really useless for SEO?
Google does not consider text/HTML ratio for SEO. It is not a ranking factor. It can play a minor role for speed, or in extreme cases of huge pages (hundreds of MB) exceeding download limits, but this...
John Mueller Feb 05, 2021
★★ Do you really need to wait 30 days to see the impact of your Core Web Vitals optimizations in PageSpeed Insights?
Field data in PageSpeed Insights is delayed by about 30 days. To quickly verify if changes are improving performance, use lab data from testing tools, then wait 30 days to see the actual impact in the...
John Mueller Feb 05, 2021
★★★ Core Web Vitals: Which version truly impacts your ranking when Google shows the AMP?
When Google has data for both AMP and non-AMP versions and displays the AMP version in the results, it is the data from the AMP version that is used for ranking. This principle also applies to interna...
John Mueller Feb 05, 2021
★★★ How does Google really group your pages to evaluate Core Web Vitals?
Google does not have Core Web Vitals data for each page individually. Pages are grouped based on the amount of available data. This can be at the entire domain level or among groups of similar pages. ...
John Mueller Feb 05, 2021
★★★ How does Google measure Core Web Vitals on your AMP and non-AMP pages?
Google tracks Core Web Vitals data from real users. If users access the AMP version via Search and the non-AMP version directly, Google can follow both versions separately. For ranking purposes, Googl...
John Mueller Feb 05, 2021
★★★ How does Google group your pages to measure Core Web Vitals?
Google does not have CWV data for every individual page. Pages are grouped according to the available data: at the domain/origin level if there is little data, or by groups of similar pages if there i...
John Mueller Feb 05, 2021
★★★ Is it true that your PageSpeed Insights tests don't accurately reflect what Google really measures regarding Core Web Vitals?
For ranking with Core Web Vitals, Google uses what real users see (field data), not the renders from Googlebot or PageSpeed Insights. Lab tools (controlled environment) provide predictions, not actual...
John Mueller Feb 05, 2021
★★★ Does Google really track Core Web Vitals for AMP and non-AMP pages separately?
Google tracks CWV data for both AMP and non-AMP versions separately based on actual user data. If users go directly to the non-AMP URLs and use Search to access the AMP URLs, both versions will have d...
John Mueller Feb 05, 2021
★★★ Core Web Vitals: Why Do Only Real User Data Matter for Ranking?
For the Core Web Vitals ranking signal, Google uses real user data (field data) from actual users, not lab data. Lab testing tools are helpful for identifying issues and testing fixes, but only real u...
John Mueller Feb 05, 2021
★★★ Why does Google overlook your Lighthouse scores when ranking your site?
For the Core Web Vitals ranking signal, it is the field data that is taken into account, not lab data....
John Mueller Feb 05, 2021
★★ Why do PageSpeed Insights and Googlebot show different results for your site?
PageSpeed Insights is based on Chrome, not Googlebot. Googlebot also uses Chrome for rendering but must obey robots.txt for all embedded content (CSS/JS), unlike PageSpeed Insights. The differences be...
John Mueller Feb 05, 2021
★★★ Is it true that the text/HTML ratio is completely irrelevant for Google SEO?
Google does not use the concept of text/HTML ratio as an SEO ranking factor. Many tools calculate this metric, but it does not affect SEO. Only two extreme cases can pose a problem: reduced page speed...
John Mueller Feb 05, 2021
★★★ Does PageSpeed Insights really reflect what Google sees on your site?
PageSpeed Insights is based on Chrome, not on Googlebot. Googlebot also uses Chrome for rendering but must follow robots.txt for embedded resources (CSS, JS). PageSpeed Insights is not subject to robo...
John Mueller Feb 05, 2021
★★★ Do You Really Need to Pass All 3 Core Web Vitals to Get an SEO Boost?
John Mueller also explained in a webmaster hangout that, as part of the rollout of the "Page Experience / Core Web Vitals" project next May, all 3 KPIs (FID, CLS, LCP) will need to be met with positiv...
John Mueller Feb 01, 2021
★★ Do cookie banners really affect your Core Web Vitals score?
Google does not differentiate between GDPR-compliant cookie banners and other page elements for speed calculation. Even if legally required, a CMP banner that slows down loading or causes layout shift...
John Mueller Jan 29, 2021
★★★ Can speed really hurt your SEO with Core Web Vitals?
Speed is currently used as a ranking signal for mobile. In May 2021, with the rollout of Core Web Vitals, this signal is likely to be reinforced. However, content relevance remains paramount: a highly...
John Mueller Jan 29, 2021
★★★ Do Core Web Vitals really need to be ALL in the green to boost your ranking?
To qualify for the Core Web Vitals ranking bonus starting May 2021, the metrics must be in the green zone. If any metric is yellow or red, it will not count as compliant. All criteria must be met to b...
John Mueller Jan 29, 2021
★★ Do Core Web Vitals really change after the initial page load?
LCP values are updated as content loads. CLS values can be updated based on user actions. These metrics are not fixed at the time of the initial load....
Google Jan 28, 2021
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