Table of contents

Optimizing Core Web Vitals: Boosting FID, CLS & LCP

Today, we will delve into the realm of Core Web Vitals — specifically, First Input Delay (FID), Cumulative Layout Shift (CLS), and Largest Contentful Paint (LCP). These metrics are now integral parts of Google’s ranking criteria and can significantly influence a site’s performance.

Understanding Core Web Vitals

Before diving into optimization techniques, it’s pivotal to comprehend what these metrics measure:

Largest Contentful Paint (LCP): Measures the loading performance. A good LCP score ensures that the main content of a page loads and becomes visible within the first 2.5 seconds.

First Input Delay (FID): Assesses interactivity. For an optimized user experience, pages should have an FID of less than 100 milliseconds.

Cumulative Layout Shift (CLS): Gauges visual stability. A page should maintain a CLS of less than 0.1 to ensure elements don’t shift unexpectedly, causing accidental clicks or user confusion.

Optimizing Largest Contentful Paint (LCP)

Upgrade Hosting: Over the years, we’ve noticed the difference a robust hosting solution can make. Consider upgrading to a premium hosting plan or a dedicated server.

Use a Content Delivery Network (CDN): CDNs like Cloudflare or Akamai can significantly reduce load times by serving content from the closest server to the user.

Optimize Images: Tools like ImageOptim or TinyPNG can compress images without sacrificing quality.

Remove Unnecessary Third-party Scripts: Too many third-party scripts can bloat your site. Audit and retain only the essentials.

Optimizing First Input Delay (FID)

Minimize JavaScript Execution: Heavy JS can hinder interactivity. Tools like Google’s Lighthouse can help identify and minimize long tasks.

Use Browser Caching: Leveraging browser cache can significantly reduce resource load times.

Optimize CSS: Prioritize critical CSS and defer non-essential styles.

Optimizing Cumulative Layout Shift (CLS)

Use Set Dimensions: Always specify dimensions for images, videos, and other media elements.

Ensure Ad Elements Have Reserved Space: Unexpected ad insertions can disrupt layout. Define a specific space for ads to prevent content shifts.

Preload Key Assets: Preloading fonts and critical assets can help in stabilizing the layout.

Monitoring Core Web Vitals

To stay ahead, it’s essential to consistently monitor your website’s performance. Here are some tools I’ve regularly employed:

Google Search Console: The Core Web Vitals report offers a holistic view of your website’s performance metrics.

PageSpeed Insights: This tool provides real-time insights into page performance, including Core Web Vitals.

WebPageTest: An advanced tool offering granular insights into load times and potential issues.


To wrap up, optimizing Core Web Vitals is not just about pleasing search engines; it’s about offering a seamless, pleasant experience to your users. And in today’s digital landscape, user experience is paramount.

agence conseil en email marketing

Related posts

Dive into the core metrics of Google Ads. From click-through rates to conversion tracking, learn how to evaluate and optimize your campaigns using the most impactful key performance indicators.
Discover the power of geo-targeting in Google Ads. Learn how to harness localized strategies to connect with audiences more effectively and drive impactful results in specific regions.
Unlock the power of audience targeting in Google Ads. Dive deep into techniques and strategies to reach your customers, ensuring higher ROI and better engagement.
Contact us

N’hésitez pas à nous contacter dès maintenant pour en discuter davantage!​