The Digital Marketer's Guide to Google Core Web Vitals

  • Oct 03, 2023

  • by Narender Kumar

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The Digital Marketer's Guide to Google Core Web Vitals

Understanding your website's performance is pivotal for ensuring a seamless user experience. Google has consistently introduced tools and metrics to help webmasters gauge their site's performance. One such metric is the Core Web Vitals, which are essential performance indicators for all web experiences. This guide delves into the intricacies of Core Web Vitals and offers insights on enhancing your website's performance.

The Evolution of Web Performance

Web performance optimisation has transformed over the years. Earlier, simple actions like compressing images or minifying style sheets could significantly boost a site's performance. However, the focus has shifted with advancements in connection speeds and the introduction of various plugins. Google's PageSpeed Insights (PSI) remains a valuable tool for evaluating page loads, but to truly excel, websites must now meet the standards set by the Core Web Vitals Assessment.

Understanding Core Web Vitals

Core Web Vitals are metrics introduced in 2021 that focus on user experience. According to Google, these metrics reflect real-world user-centric outcomes. The current Core Web Vitals include:

  • First Contentful Paint (FCP)
  • First Input Delay (soon to be replaced by Interaction to Next Paint)
  • Interaction to Next Paint (INP)
  • Time to First Byte (TTFB)
  • Largest Contentful Paint (LCP)
  • Cumulative Layout Shift (CLS)

Each metric has its significance:

  • FCP: Measures the time taken for the first content piece to render on the screen.
  • FID: Gauges the time between a user's interaction and the browser's response.
  • INP: Assesses overall responsiveness to user interactions.
  • TTFB: Measures the time between a resource request and the arrival of the first byte.
  • LCP: Reports the render time of the largest visible content.
  • CLS: Measures unexpected layout shifts during a page's lifespan.

Assessing Core Web Vitals for Enhanced UX and SEO

To analyse a webpage's performance, tools like PageSpeed Insights are invaluable. This tool provides insights into URL-level data, domain-level data, lab data, and field data. While the traditional numeric rating offers a detailed breakdown, the Core Web Vitals assessment, based on real user data, is what Google uses in its ranking algorithms. The goal is to use lab data to improve and eventually pass the Core Web Vitals assessment.

Technical Deep Dive

To truly understand and optimise for Core Web Vitals, one can utilise Chrome DevTools. This tool provides insights into scripting tasks, main thread activities, and more. For instance, JavaScript execution often takes up a significant portion of the main thread's time. By analysing individual scripts and their load times, one can identify bottlenecks and areas for optimisation.

Other tools that can assist in this journey include GTMetrix, Google Search Console, and Screaming Frog SEO Spider. Each offers unique insights and functionalities to help webmasters optimise their sites.


Improving page speed and performance is no longer a straightforward task. With the introduction of Core Web Vitals, the challenge has become multifaceted. However, achieving optimal performance is attainable with the right tools and understanding. Commit to the journey, and the results will follow.

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Narender Kumar
  • Narender Kumar
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