Press enter and start recording the results. The first approach to this utility is quite intuitive because the test results are divided into specific sections. It starts with recording the real data.
This is a key aspect of Pagespeed. The platform updates have neatly separated the data collected in the field from that obtained in the lab. The latter section has been moved to the background to leave the field to what is recorded by users while browsing.
data field
The data taken into consideration are those concerning the essential web signals, the web vitals. These values are real data taken through the navigation of users thanks to Chrome User Experience Report in the last 28 days and apply to the entire domain, but also to the single page thanks to the switch.
Immediately after, we go into the most important metrics and then continue with some of the interesting sections. Namely, those of opportunities and diagnostics, where you can find several tips to improve images , CSS, code and cache.
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Pagespeed Insight Field Data
The great reality that can make the difference with this tool: when you analyze a page you can count on the data of the Chrome User Experience Report (CrUX) . That is, the Chrome user experience report that suggests metrics related to how the user on Chrome navigates the website.
How to read the ranking? Pagespeed Insight shows field data (called Real User Monitoring or simply RUM ), when available, anonymously collecting real-world user performance. And it groups them into 3 sets of browsing experiences: fast, moderate or slow .
Largest Contentful Paint (LCP).
First Contentful Paint (FCP).
First Input Delay (FID).
Cumulative Layout Shift (CLS).
In practice, in the field data section you can record the behavior of the Core Web Vitals on a site and on the single web page. With a simple command you can switch from mobile to desktop data and decide whether or not to expand the display of performance details.
real pagespeed analysis
The numbers delve into the proportion of pages that respond to good results or have problems. To close this section we have a box that suggests the period in which the data was collected, the duration of visits , the devices used by users, connections and Chrome versions.
Pagespeed Insight lab data
Pagespeed uses a series of elements to perform a check and determine the performance of the page. In particular, in addition to the field data, it also uses the numbers obtained in the laboratory . Numbers that are accompanied, unlike those recorded in the field, by screenshots of the pages that simulate the loading evolution.
google pagespeed laboratory data
What are the items considered in this section of the Pagespeed Insight tool? They are metrics needed to determine the page loading speed . But also stability, reaction times and user experience. But what do the various items mean? What exactly do they refer to?
First Contentful Paint
The time it takes the browser to display the first content on the page. This key metric indicates how many seconds the user has to wait before seeing an image or a string of text.
First Meaningful Paint
Displaying the first content useful to those who surf. It does not only evaluate the physical presence, the appearance of text or visuals: this step concerns the presence of the main visible content.
Speed Index
Element directly linked to the first and second metrics. This measure defines the speed index with which they load and are displayed to people who visit the web page.
Time to Interact
The time you have to wait to finally interact with the page. A parameter that takes into consideration the resource in question and is not limited to recording simple appearances of text and images .
First CPU Idle
The first CPU downtime is when people can interact and query elements of the web page. The page can handle input from people on the other side of the interface.
Estimated Input Latency
Estimated input latency (or first potential interaction delay). What is it for? It defines exactly how quickly a page responds to external stimuli performed by a user.
