Cned.fr Formation tout au long de la vie - Page d'accueil - CNED
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cned.fr Mobile Performance
22/100
These metrics represent real-world Chrome users experience viewing cned.fr on mobile devices. Reports are focused on loading performance and other critical factors that most affect user experience. Follow our guide to track, optimize, and improve the quality of your web pages.
User Loading Experience
Largest Contentful Paint
First Contentful Paint
Cumulative Layout Shift
First Input Delay
Metrics
Total Blocking Time4/100 1,590 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Speed Index5/100 11.5 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Time to Interactive12/100 13.2 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Largest Contentful Paint22/100 5.3 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint59/100 3.6 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift74/100 0.159
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (19)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Eliminate render-blocking resources
Potential savings of 1,280 ms
1,278 ms
Remove unused JavaScript
Potential savings of 281 KiB
1,200 ms
Serve images in next-gen formats
Potential savings of 220 KiB
1,050 ms
Preload key requests
Potential savings of 930 ms
930 ms
Efficiently encode images
Potential savings of 120 KiB
750 ms
Reduce initial server response time
Root document took 1,150 ms
546 ms
Remove unused CSS
Potential savings of 55 KiB
450 ms
Defer offscreen images
Potential savings of 58 KiB
150 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Ensure text remains visible during webfont load
Reduce the impact of third-party code
Third-party code blocked the main thread for 1,320 ms
Serve static assets with an efficient cache policy
26 resources found
Minimize main-thread work
5.5 s
Reduce JavaScript execution time
3.5 s
Keep request counts low and transfer sizes small
60 requests • 1,234 KiB
Avoid long main-thread tasks
20 long tasks found
User Timing marks and measures
30 user timings
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
9 chains found
Avoid large layout shifts
5 elements found
Passed Audits (11)
Preconnect to required origins
Avoids enormous network payloads
Total size was 1,234 KiB
Avoid multiple page redirects
Potential savings of 9,780 ms
Minify JavaScript
Potential savings of 22 KiB
Uses passive listeners to improve scrolling performance
Properly size images
Minify CSS
Enable text compression
Avoids `document.write()`
Use video formats for animated content
Avoids an excessive DOM size
518 elements
cned.fr Mobile SEO
93/100
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more. Run these additional validators on your site to check additional SEO best practices.
Should Fix (1)
Mobile Friendly
Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. Learn more.
Tap targets are not sized appropriately
18% appropriately sized tap targets
Passed Audits (11)
Links have descriptive text
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Image elements have `[alt]` attributes
Page isn’t blocked from indexing
Document avoids plugins
Document has a meta description
Document has a valid `hreflang`
Document uses legible font sizes
61.54% legible text
Page has successful HTTP status code
Links are crawlable
Document has a `<title>` element
cned.fr Mobile Best Practices
54/100
These checks highlight opportunities to improve the overall code health of cned.fr mobile page. Current recommendations will help to make your page fast and secure, to create a good user experience and to avoid deprecated technologies.
Should Fix (6)
Trust and Safety
Includes front-end JavaScript libraries with known security vulnerabilities
10 vulnerabilities detected
Links to cross-origin destinations are unsafe
Does not use HTTPS
1 insecure request found
General
Browser errors were logged to the console
User Experience
Serves images with low resolution
Displays images with incorrect aspect ratio
Passed Audits (8)
Avoids requesting the notification permission on page load
Detected JavaScript libraries
Avoids deprecated APIs
Page has the HTML doctype
Avoids requesting the geolocation permission on page load
Allows users to paste into password fields
Avoids Application Cache
Properly defines charset
cned.fr Mobile Progressive Web App
25/100
These checks validate the aspects of a Progressive Web App. Learn more. These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Should Fix (9)
Fast and reliable
Current page does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive at 13.2 s
`start_url` does not respond with a 200 when offline
PWA Optimized
Does not set a theme color for the address bar.
Is not configured for a custom splash screen
Manifest doesn't have a maskable icon
Installable
Does not use HTTPS
1 insecure request found
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
Passed Audits (5)
Content is sized correctly for the viewport
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Redirects HTTP traffic to HTTPS
Contains some content when JavaScript is not available
Provides a valid `apple-touch-icon`
cned.fr Mobile Accessibility
79/100
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged. These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Should Fix (4)
Names and labels
These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.
Form elements do not have associated labels
Navigation
These are opportunities to improve keyboard navigation in your application.
`[id]` attributes on active, focusable elements are not unique
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Best practices
These items highlight common accessibility best practices.
`[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5.
Passed Audits (16)
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`<html>` element has a valid value for its `[lang]` attribute
`[aria-*]` attributes match their roles
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Image elements have `[alt]` attributes
ARIA IDs are unique
`[aria-*]` attributes have valid values
Heading elements appear in a sequentially-descending order
`<html>` element has a `[lang]` attribute
Buttons have an accessible name
`[aria-*]` attributes are valid and not misspelled
`[aria-hidden="true"]` is not present on the document `<body>`
`[aria-hidden="true"]` elements do not contain focusable descendents
The page contains a heading, skip link, or landmark region
Links have a discernible name
Document has a `<title>` element
Mobile Usability
97/100
These checks validate how easily a visitor can use cned.fr on a mobile device. Test results include a list of any mobile usability problems. Mobile usability problems are issues that can affect a user that visits the page on a mobile (small screen) device, including small font sizes (which are hard to read on a small screen).
Should Fix (1)
Size tap targets appropriately
Passed Audits (4)
Avoid plugins
Configure the viewport
Size content to viewport
Use legible font sizes
Mobile Speed
61/100
These checks analyze the performance of cned.fr on mobile devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (4)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Optimize images
Minify HTML
Passed Audits (6)
Avoid landing page redirects
Enable compression
Reduce server response time
Minify CSS
Minify JavaScript
Prioritize visible content
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