Tools & Wizards About Us

Report Summary

  • 1

    Performance

    Renders faster than
    19% of other websites

  • 100

    Accessibility

    Visual factors better than
    that of 97% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 91

    SEO

    Google-friendlier than
    70% of websites

certificat-air.gouv.fr

Le site officiel de la vignette Crit'Air (certificat qualité de l'air) - Ministère de la Transition écologique

Page Load Speed

2.6 sec in total

First Response

279 ms

Resources Loaded

2.2 sec

Page Rendered

68 ms

About Website

Visit certificat-air.gouv.fr now to see the best up-to-date Certificat Air content for France and also check out these interesting facts you probably never knew about certificat-air.gouv.fr

Le seul site officiel à délivrer la vignette Crit'Air (certificat qualité de l'air), établie en fonction des émissions polluantes du véhicule.

Visit certificat-air.gouv.fr

Key Findings

We analyzed Certificat-air.gouv.fr page load time and found that the first response time was 279 ms and then it took 2.3 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.

Performance Metrics

certificat-air.gouv.fr performance score

1

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.3 s

1/100

10%

LCP (Largest Contentful Paint)

Value25.0 s

0/100

25%

SI (Speed Index)

Value16.2 s

0/100

10%

TBT (Total Blocking Time)

Value2,740 ms

3/100

30%

CLS (Cumulative Layout Shift)

Value1.533

0/100

15%

TTI (Time to Interactive)

Value25.8 s

0/100

10%

Network Requests Diagram

certificat-air.gouv.fr

279 ms

www.certificat-air.gouv.fr

670 ms

tarteaucitron.js

187 ms

runtime.571c4d16c77b462a.js

279 ms

polyfills.50e71b5a60afa639.js

376 ms

Our browser made a total of 13 requests to load all elements on the main page. We found that all of those requests were addressed to Certificat-air.gouv.fr and no external sources were called. The less responsive or slowest element that took the longest time to load (747 ms) belongs to the original domain Certificat-air.gouv.fr.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.5 MB (79%)

Content Size

1.8 MB

After Optimization

379.6 kB

  • HTML
  • JavaScript
  • CSS

In fact, the total size of Certificat-air.gouv.fr main page is 1.8 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 25% of websites need less resources to load. Javascripts take 952.8 kB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 51.6 kB

  • Original 61.3 kB
  • After minification 61.0 kB
  • After compression 9.7 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 51.6 kB or 84% of the original size.

JavaScript Optimization

-74%

Potential reduce by 702.9 kB

  • Original 952.8 kB
  • After minification 952.6 kB
  • After compression 249.9 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 702.9 kB or 74% of the original size.

CSS Optimization

-86%

Potential reduce by 713.7 kB

  • Original 833.7 kB
  • After minification 825.4 kB
  • After compression 120.0 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Certificat-air.gouv.fr needs all CSS files to be minified and compressed as it can save up to 713.7 kB or 86% of the original size.

Requests Breakdown

Number of requests can be reduced by 4 (57%)

Requests Now

7

After Optimization

3

  • JavaScript
  • CSS

The browser has sent 7 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Certificat Air. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

certificat-air.gouv.fr accessibility score

100

Accessibility Issues

Best Practices

certificat-air.gouv.fr best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

certificat-air.gouv.fr SEO score

91

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

robots.txt is not valid

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](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    FR

  • Language Claimed

    FR

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Certificat-air.gouv.fr can be misinterpreted by Google and other search engines. Our service has detected that French is used on the page, and it matches the claimed language. Our system also found out that Certificat-air.gouv.fr main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

Open Graph description is not detected on the main page of Certificat Air. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: