Definition of PageSpeed Insight 

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on the theme SEO tools and KPIs


Le web page loading time is an essential factor in offering a user experience optimal. A loading speed improves not only visitor satisfaction, but also search engine optimization and conversion.

In this context, it is essential to have a tool for measuring and optimising performance. This is where PageSpeed Insights from Google.

Our SEO Agency explains how it works:

PageSpeed Insights

What is PageSpeed Insights?

PageSpeed Insights (PSI) is a free online tool provided by Google, which assesses the performance and loading time of a web page, both on mobile and desktop devices. PSI analyses your site and awards a score from 0 to 100 based on various technical criteria and the loading speed observed.

A high score indicates a fast, high-performance site, while a low score suggests that the page needs to be optimised to reduce its loading time.

How does PageSpeed Insights work?

When you enter the URL of a page to be analysed, PSI performs several operations to determine the site's performance:

  1. Field data collection PSI recovers anonymous statistical data from Chrome users who have agreed to share their browsing data. This information, based on the actual experience of Internet users, is used to measure page loading times.
  2. Source code analysis PSI examines the code HTML, CSS and JavaScript of the page to identify any problems that may be affecting performance, such as unoptimised resources, slow display or blocking scripts.
  3. Overall score Finally, Page Speed Insights assigns an overall performance score based on a series of metrics, such as First Contentful Paint (FCP), the Largest Contentful Paint (LCP) or the Cumulative Layout Shift (CLS). Each metric has a different weighting in the calculation of the final score.

Understanding the results of the analysis

The results provided by PageSpeed Insights take the form of a report comprising several sections:

  • Overall score The overall score, between 0 and 100, assesses the speed of your site. A score above 90 indicates excellent performance, while a score between 50 and 90 indicates average performance. Below 50, performance is considered insufficient.
  • Metric PSI presents details of the different metrics used to evaluate page performance, along with their respective values.
  • Audit report This section identifies the technical problems encountered by your site and suggests solutions to improve performance. The recommendations are classified according to their priority (high, medium or low).

Some key concepts to be aware of

To fully understand the results of Page Speed Insights, it is useful to familiarise yourself with a few key concepts:

  • First Contentful Paint (FCP) This metric measures the time elapsed between the request to load the page and the display of the first element. visible on the screen. A fast FCP indicates that the user has quick access to content, even if the page is not yet fully loaded.
  • Largest Contentful Paint (LCP) LCP: LCP measures the time taken to display the largest visible element (text, image, video, etc.) on the screen when the page is first loaded. A short LCP is generally synonymous with a good user experience.
  • Cumulative Layout Shift (CLS) CLS: CLS assesses the visual instability of a page, i.e. unexpected changes in the layout when the site is loaded. A low CLS value (ideally less than 0.1) guarantees a stable and predictable presentation of the page.

Optimise your site with PSI's recommendations

The PageSpeed Insights reports don't just give you a performance score; they also provide valuable advice on how to improve your site's loading speed. Some of the most common suggestions include:

  • Image optimisation reduce the size and weight of images, use appropriate formats, set up a progressive loading system (lazy loading).
  • Compressing HTML, CSS and JavaScript code Use tools such as Gzip or Brotli to reduce file size and delete or move blocking scripts.
  • Browser caching Configure the server to store certain elements of the page in the visitor's cache memory, in order to speed up subsequent loading.

By following the recommendations provided by PageSpeed Insights and carrying out regular performance audits, you can optimise your site to deliver an unrivalled user experience and maximise engagement, return on investment and conversion rates. conversion rate and the natural referencing of your web page.

So don't hesitate to use this essential tool!

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