Core Web Vitals: What They Are and How to Improve Them

Forget the fluff; let’s cut right to the chase. Core Web Vitals are not just another SEO buzzword. They’re a critical, Google-imposed evolution in how websites are ranked, effectively turning user experience into a quantifiable metric. This isn’t just about making your site look pretty; it’s about making it as user-friendly as possible, which, in turn, boosts your SEO ranking. As someone who’s wrestled with the ever-changing landscape of SEO for years, I’ve seen trends come and go, but Core Web Vitals represent something morea fundamental shift in how we approach website design and optimization.

What are Core Web Vitals and Why are They Important for SEO?

By reading this article, you will learn:
– Core web vitals are metrics related to speed, responsiveness, and visual stability of a website.
– They are crucial for SEO as they directly impact user experience and search ranking.
– You can measure and improve core web vitals through various optimization techniques like image optimization, CDN usage, JavaScript minimization, and more.

What Are Core Web Vitals?

Core Web Vitals are a set of specific factors that Google considers important in a webpage’s overall user experience. They are part of Google’s “page experience” signals, which include existing search signals such as mobile-friendliness, safe-browsing, HTTPS-security, and intrusive interstitial guidelines. Specifically, Core Web Vitals focus on three aspects: loading performance (Largest Contentful Paint, or LCP), interactivity (First Input Delay, or FID), and visual stability (Cumulative Layout Shift, or CLS).

From my experience, I can tell you that focusing on these aspects can dramatically change how visitors interact with your website. I remember working on a client’s site that had terrible loading times. By focusing on improving the LCP, we not only improved its Core Web Vitals scores but also saw a significant decrease in bounce rates.

Why Are Core Web Vitals Important?

Here’s the deal: Google has explicitly stated that Core Web Vitals are a ranking factor. This means that if your site performs poorly on these metrics, it’s less likely to show up on the first page of search results. But it’s not just about appeasing the Google gods. Improving your site’s Core Web Vitals scores improves the user experience, leading to higher engagement, better conversion rates, and, ultimately, more revenue.

An interesting case study in this realm is the improvement of Pinterest’s mobile site. By focusing on Core Web Vitals, Pinterest improved user engagement and saw a significant increase in SEO traffic and sign-ups. This is a clear indicator of the tangible benefits that come with optimizing these metrics.

How to Measure Core Web Vitals

Measuring your site’s Core Web Vitals is the first step towards improvement. Thankfully, Google provides several tools for this, with PageSpeed Insights being one of the most straightforward. Another great tool is the Chrome User Experience Report, which offers real-world user experience insights.

During an overhaul of my own blog, I relied heavily on these tools to identify problem areas. It was a bit of a reality check to see how poorly some pages performed, but it provided a clear roadmap for improvements.

How to Improve Core Web Vitals

1. Optimize Your Images

Large images are one of the biggest culprits when it comes to slow page load times. Compressing images and using modern formats like WebP can drastically reduce file sizes without compromising quality.

2. Use a Content Delivery Network (CDN)

A CDN can significantly improve your sites loading times by storing copies of your site on servers around the world, so users always download from a location near them.

3. Minimize JavaScript

Excessive or inefficient JavaScript can kill your sites performance. Minimizing and deferring JavaScript can improve both loading times and interactivity.

4. Use Lazy Loading

Lazy loading defers the loading of non-critical resources at page load time. Instead, items are loaded only when they’re needed (e.g., when scrolling down the page), which can significantly improve LCP.

5. Reduce Server Response Time

Improving your server’s response time can have a dramatic impact on your site’s performance. This might mean upgrading your hosting plan or optimizing your server’s configuration.

6. Minimize CSS

Just like JavaScript, CSS can also hinder performance if not handled properly. Minimizing and optimizing CSS delivery can improve render times.

7. Use AMP

AMP (Accelerated Mobile Pages) is a web component framework designed to speed up the loading time of pages on mobile devices. While it’s not a fit for every site, it can offer significant improvements in mobile performance.

8. Reduce Redirects

Each redirect triggers an additional HTTP request-response cycle, increasing the load time of your page. Eliminating unnecessary redirects can shave off precious milliseconds.

9. Optimize for Mobile

Given the mobile-first indexing approach of Google, ensuring your site is optimized for mobile is crucial, not just for UX but for SEO as well.

Core Web Vitals FAQs

What are the core web vitals?

They are a set of real-world, user-centered metrics that quantify key aspects of the user experience.

What is the difference between core web vitals and page experience signals?

Core Web Vitals are a subset of page experience signals, focusing specifically on loading, interactivity, and visual stability.

What is a good core web vitals score?

A good score for LCP is under 2.5 seconds, for FID under 100 milliseconds, and for CLS less than 0.1.

How do I check my core web vitals?

Tools like Google’s PageSpeed Insights and the Chrome User Experience Report are excellent for measuring these metrics.

What happens if my site doesnt meet the core web vitals standards?

Failing to meet the standards can negatively impact your site’s ranking on Google, leading to decreased visibility and traffic.


Core Web Vitals are not just another hoop to jump through. They represent a fundamental shift towards prioritizing the user experience in the web’s architecture. As someone who’s seen the impact of these metrics first-hand, I can attest to their importance not just for SEO, but for the health and success of your site as a whole. By focusing on these metrics, we’re not just chasing algorithm updates; we’re building better, faster, and more engaging websites that serve our users first and foremost. It’s a win-win scenario that’s hard to argue against, and it’s why Core Web Vitals should be at the forefront of any web optimization strategy.

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Xavier Berkness

Xavier Berkness is the President of PERC, a renowned Digital Marketing Company. With an impressive career spanning over two decades since 1996, Xavier has earned a reputation as a leader in the field of digital marketing. He has leveraged his deep understanding and expertise in building websites to author a highly-regarded book, 'Mastering On-Page Optimization - The Secret Sauce of an SEO System.' Xavier's impactful contributions to the industry have been recognized in a Star Tribune feature, where he was hailed as a 'Mover and Shaker.' Outside the professional realm, Xavier is a nature lover who cherishes time spent near the ocean. He continues to fuel his passion for digital marketing, relentlessly seeking new knowledge and strategies every day. His combination of professional prowess and personal charm make Xavier a trusted authority in the digital marketing industry.