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metrics enables webmasters to align technical optimizations with actual ranking signals rather than assumptions or outdated practices.
Quick SEO Quiz

Test your SEO knowledge in 5 questions

Less than a minute. Find out how much you really know about Google search.

🕒 ~1 min 🎯 5 questions
★★★ Should you unblock JavaScript and CSS in robots.txt for better SEO?
Blocking access to JavaScript and CSS files via robots.txt prevents Google from downloading these resources, which can cause rendering issues. If content is generated by JavaScript or if non-native la...
Martin Splitt Jun 23, 2020
★★ Why aren't all your Disqus comments indexed in the same way?
The indexing of Disqus comments varies based on the implementation (caching in static HTML or not). Martin Splitt mentioned a possible bug. Indexing is not uniform across all sites using Disqus....
John Mueller Jun 23, 2020
★★ Does JavaScript really consume more crawl budget than classic HTML?
JavaScript sites may consume slightly more crawl budget if JS makes extra network requests, but Google caches common resources (JS, CSS, identical images) between pages. The real impact on crawl budge...
Martin Splitt Jun 17, 2020
★★ Why are your Lighthouse mobile scores consistently lower than desktop?
Mobile Lighthouse scores are generally lower than desktop because mobile processors are less powerful and the connection is often slower. Mobile represents the smallest common denominator; it is more ...
Martin Splitt Jun 17, 2020
★★★ Should you really prioritize critical content server-side before metadata in SSR?
For a client/server hybrid rendering, prioritize Server-Side Rendering of critical content (title, meta description, canonical, main content) over secondary elements. The main content should always be...
Martin Splitt Jun 17, 2020
★★★ Is your lazy loading preventing Google from detecting your images?
If lazy loading shows placeholder URLs in the rendered HTML instead of the real image URLs, Google will only see the placeholders. This indicates an incorrect lazy loading implementation that needs to...
Martin Splitt Jun 17, 2020
★★ Can you really rely on Google's cache: to diagnose an SEO issue?
Google's cache: feature in Search is not a testing tool and should not be used to diagnose SEO issues. If the rendering appears incorrect, it means nothing. Official testing tools like Search Console ...
Martin Splitt Jun 17, 2020
★★ Can you really have a good FID while suffering from catastrophic TTI?
It is possible to have a good First Input Delay score while having poor Time to Interactive and Total Blocking Time scores, likely due to intermittent blocking of the main thread not captured by FID. ...
Martin Splitt Jun 17, 2020
★★ Should you still be concerned about native lazy loading for SEO?
Googlebot Chromium supports native lazy loading of images (loading='lazy'), introduced in recent versions of Chrome....
Martin Splitt Jun 17, 2020
★★ Does JavaScript really drain your crawl budget?
JavaScript sites may consume slightly more crawl budget if the JS makes additional network requests, but Google caches common resources. The actual impact on crawl budget is generally negligible excep...
Martin Splitt Jun 17, 2020
★★ Is it really essential to split your JavaScript by page to optimize crawling?
It is possible and recommended to load scripts (like reCAPTCHA) only on the pages where they are necessary, using code splitting techniques to optimize performance....
Martin Splitt Jun 17, 2020
★★ Why doesn’t Google need to download your images to index them?
Images are often not downloaded by Search Console testing tools for performance reasons, but this does not affect indexing. For the main web crawl, Google only needs the image URL, alt text, and conte...
Martin Splitt Jun 17, 2020
★★★ Can poorly implemented lazy loading really make your images invisible to Google?
If lazy loading only shows placeholder URLs in the rendered HTML instead of the actual image URLs, it indicates incorrect implementation and Google will not see the real images. Check the rendered HTM...
Martin Splitt Jun 17, 2020
★★★ Is it true that Google's cache is a trap for testing your page's rendering?
Google's cache: function (cache URL) is not a reliable testing tool. If the rendering in the cache seems incorrect, it means nothing. Use the URL Inspection Tool in Search Console to test rendering, n...
Martin Splitt Jun 17, 2020
★★ Is it possible to have great Core Web Vitals while running a technically flawed site?
It is possible to have an excellent First Input Delay but poor Time to Interactive and Total Blocking Time, probably due to JavaScript blocks that do not affect the FID. If the actual user experience ...
Martin Splitt Jun 17, 2020
★★ Is it true that native lazy loading is crawled by Googlebot?
The headless Chromium-based Googlebot supports native lazy loading for images (loading='lazy' attribute)....
Martin Splitt Jun 17, 2020
★★★ Are Core Web Vitals truly crucial for Google ranking?
The importance of signals like speed (Core Web Vitals) varies depending on the query. For a clear navigational search (e.g., 'SEO Roundtable'), Google will not favor a faster but less relevant site. I...
John Mueller Jun 12, 2020
★★ Does Google really estimate the Core Web Vitals of low-traffic sites?
For sites lacking sufficient traffic in the Chrome User Experience Report, Google cannot display Core Web Vitals data in Search Console. However, the site will not be excluded from search results: Goo...
John Mueller Jun 12, 2020
★★★ Are Core Web Vitals truly a ranking factor or just smoke and mirrors?
In June 2020, Core Web Vitals are not yet a ranking factor. Google announced that it would give approximately six months' notice before using them. The position changes observed at the announcement da...
John Mueller Jun 12, 2020
★★★ Is Google really testing the AMP version for Core Web Vitals even if the mobile version is indexed?
For evaluating Core Web Vitals and the page experience score, Google tests the version that users actually see. If a site has an AMP version, it is the AMP version that will be tested for speed and us...
John Mueller Jun 12, 2020
🔔

Get real-time analysis of the latest Google SEO declarations

Be the first to know every time a new official Google statement drops — with full expert analysis.

No spam. Unsubscribe in one click.