Trang chủ Onpage SEO What is Pagespeed Insights? The ultimate guide to optimizing website speed

What is Pagespeed Insights? The ultimate guide to optimizing website speed

bởi Nguyễn Thành Tiến

What is Pagespeed Insights ? When building a website, you definitely want your website to have high performance with indicators such as user-friendly interface, fast page loading speed, and high number of website visits. But you don’t know or don’t know what Pagespeed Insights is and how it affects these metrics. The answer will be answered in this article.

How to optimize Pagespeed Insights to rank high in search engines?

Guide to optimizing Pagespeed Insight to help your website rank at the top

What is Pagespeed Insights?

Pagespeed Insights is a website performance optimization tool from Google. It evaluates website performance based on Google’s standards as well as automatically makes suggestions to help your website improve. Pagespeed Insights focuses on 2 factors: page speed and user-friendly interface.

Learn Google Pagespeed Insights

What is Google Pagespeed Insights concept?

Using Pagespeed Insights, users can get reports on the website’s performance on both desktop and mobile. Besides, the tool also provides suggestions for website optimization through Chrome’s UX report.

Things to know about Page Speed

Google Pagespeed Insights website evaluation criteria

To evaluate whether a website is optimized or not, Google Pagespeed Insights has given the following criteria as a basis for evaluation:

  • Limit the use of redirects on the destination page.
  • Enable data compression function before sending to web browser.
  • The server’s response time is as fast as possible.
  • Extend browser cache capabilities.
  • CSS and Javascript resources on the website should be decompressed.
  • Compress images to reduce web page size.
  • Optimize the process of inserting CSS folders into the website.
  • The order of priority content in the website should be clearly and specifically established.
  • Unblock Javascript and CSS before page loads.
  • Make the most of asynchronous properties.
Google standards for evaluating Pagespeed Insights of a website

Google Pagespeed Insights Evaluation Criteria

A website that fully meets the above criteria is called a standard website. The Pagespeed Insights tool will detect and notify non-standard factors for users to find ways to improve to optimize the performance of the website.

Information about the website in Pagespeed Insights

Pagespeed Insights will provide users with information about performance metrics and components. They are arranged in the sequence below.

The information Google Pagespeed Insights provides

The information Pagespeed Insights provides to users

Speed ​​score – Speed ​​score

Speed ​​Score is also known as speed score. This Pagespeed score is based on statistics pulled from Lighthouse Lab.

Pagespeed speed score based on statistics pulled from Lighthouse Lab

Speed ​​points obtained from Lighthouse Lab

Field data – Real data

Field data consists of two main components, First Contentful Paint (FCP) and First Input Delay (FID). This information is collected based on real Chrome user experience. They are tested for at least 30 days from running Pagespeed Insights.

Real metrics tested for at least 30 days when running Pagespeed Insights

Real metrics tested for at least 30 days when running Pagespeed Insights

Lab data – Lab data

Lab data will be based on data collected and analyzed from Lighthouse Lab. These data are taken from 3G data network or simulated mobile network.

Lab data analyzed based on Lighthouse

Lab data analyzed based on Lighthouse

Opportunities – Opportunities (Suggestions for improvement)

In this Opportunities section, Pagespeed Insight will collect data on page load time and performance. From there, make suggestions for users to base on to improve page load time for efficiency.

Google Pagespeed Insights makes recommendations to improve page speed

Suggestions to improve page load time

Diagnostics – Diagnostics

The Diagnostics section provides users with best practice recommendations for users to add to their website. It offers support recommendation tools for users to use.

Diagnostics offers suggested tools supported

Diagnostics offers suggested tools supported

Passed audits – Passed audits (Stable components)

The Passed audits section includes a summary of the site’s performance. These displays do not need to be added or changed.

Does PageSpeed ​​Insights Affect SEO?

Pagespeed Insights does not directly affect the process or SEO score as well as the website’s ranking on search engines.

However, Pagespeed score and rank on SERP are closely related. Because the results obtained on Pagespeed are aggregated from performance analysis based on metrics. The higher the score, the better the website quality.

In short, a highly rated website needs to have many different factors. Of these, user experience is the most important. If your website is user-friendly, it will certainly have more visitors and be more effective.

While Google PageSpeed’s overall score isn’t a ranking factor, it’s important to pay attention to the Core Web Vitals metrics. They are part of the User Experience ranking signal and will affect a website’s organic visibility.

Pagespeed greatly affects the user experience on the website

Pagespeed does not directly affect SEO but affects user experience

How to calculate Website score on PageSpeed ​​Insights

The Pagespeed Insights score is calculated based on the Lighthouse API metric. This score represents the user’s rating of the site with a maximum score of 100.

The Google Pagespeed Insights score is equal to the sum of web speed scores and Lab Data scores analyzed by Lighthouse.

Pagespeed analyzes and gives specific scores

Pagespeed gives a specific score based on the analysis results

Based on the scale, the score results are shown as follows:

  • 0 points: The website has many errors and needs to be optimized for many problems.
  • 50 points: The website is of good quality, there are a few places that need to be optimized.
  • 100 points: Website has good quality, no errors, can function normally.

Besides, depending on the score frame, there will be different colors:

  • 0 to 49 (slow): Red
  • 50 to 89 (medium): Orange
  • 90 to 100 (fast): Green

Guide to optimizing website performance Pagespeed Insights

Instructions to improve website with Page Speed

Unzip for the server

The decompression method for the server using Pagespeed Insights helps users to detect the compressed resources from the server when passing through HTTP requests. This saves bandwidth when transferring data, increasing the download speed of the website.

Minimize resources on the website

When the size and capacity of the resources on the website are too heavy, the Pagespeed Insights tool will notify users of actions to reduce resources on the website.

At this point, the user needs to remove the comments in the code and remove the unnecessary code. Then name functions and variables shorter to minimize resources. Finally, remove the spaces to save web space.

Minimizing website resources is also a way to optimize Google Pagespeed Insights

Minimize resources on website to optimize website performance

Reduce main server response time

When the server’s response is faster than 200m/s, the Pagespeed Insights tool will detect and notify the user. At this time, users need to use better servers than hardware and Internet connection to reduce the response time of the main server.

Remove JavaScript 

To optimize Javascript on the website, the Pagespeed Insights tool will be activated based on rendering a free DOM-built page through HTML data analysis. The goal is to remove Javascript that causes content rendering. This happens when the HTML doesn’t call the blocking Javascript in the onscreen portion of the page.

Advanced caching in web browsers

To optimize the website, users need to enhance caching on the web browser when the specified resources are cached for short periods of time.

Optimize image size

Optimizing the image size is also a way to make the website more user-friendly and increase the customer experience. This tool will notify each time it detects an unoptimized image on the website. At the same time, optimizing images also helps reduce the size of your website.

Optimizing image size is one of the ways to optimize Google Pagespeed Insights and user experience

Optimize image size to increase user experience

Instructions for website analysis with Google Pagespeed Insights

Frequently asked questions about Pagespeed Insights

What is a good PageSpeed ​​Insights score?

PageSpeed ​​Insights scores range from 0 to 100 points. The higher the score, the better, and 85 or more indicates the page is performing well.

Is PageSpeed ​​Insights reliable?

PageSpeed ​​Insights currently offers a high level of accuracy when measuring user experience on a website. With different metrics, PageSpeed ​​Insights provides an accurate overview of how users interact on the website.

Where does PageSpeed ​​Insights run from?

PageSpeed ​​Insights combines data from the Chrome User Experience Report to provide performance information for websites, as collected by FCP and DCL. Performance data in both CrUX and PSI is generated by real users in the wild and represents how users experience the web.

Reference articles

>> What is SEO ? The Role of SEO in Digital Marketing Strategy
>>The best basic and advanced Onpage SEO 
optimization standards should not be ignored
>>Suggest Offpage SEO 
strategies to help rank thousands of keywords


Above is an overview of what Google Pagespeed Insights is and how to optimize website performance effectively. With Google Pagespeed Insights, it is without a doubt a great tool for optimizing page speed. Hopefully through this article, you will know how to use this tool properly to own a quality website!

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