Tools & Wizards About Us
dec.ens.fr screenshot

Report Summary

  • 15

    Performance

    Renders faster than
    27% of other websites

  • 98

    Accessibility

    Visual factors better than
    that of 94% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 98

    SEO

    Google-friendlier than
    92% of websites

dec.ens.fr

Homepage : DEC Département d'études cognitives

Page Load Speed

2.5 sec in total

First Response

412 ms

Resources Loaded

2 sec

Page Rendered

157 ms

dec.ens.fr screenshot

About Website

Visit dec.ens.fr now to see the best up-to-date DEC Ens content for France and also check out these interesting facts you probably never knew about dec.ens.fr

Les sciences cognitives s'intéressent aux grandes fonctions mentales comme la perception, la mémoire, le raisonnement, le langage, les émotions, la motricité, la prise de décision.

Visit dec.ens.fr

Key Findings

We analyzed Dec.ens.fr page load time and found that the first response time was 412 ms and then it took 2.1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

dec.ens.fr performance score

15

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value14.0 s

0/100

10%

LCP (Largest Contentful Paint)

Value28.3 s

0/100

25%

SI (Speed Index)

Value29.0 s

0/100

10%

TBT (Total Blocking Time)

Value35,770 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.026

100/100

15%

TTI (Time to Interactive)

Value58.8 s

0/100

10%

Network Requests Diagram

www.cognition.ens.fr

412 ms

stylesVersionFinale.css

83 ms

jquery.min.js

32 ms

responsiveslides.min.js

162 ms

reset.css

82 ms

Our browser made a total of 17 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Dec.ens.fr, 6% (1 request) were made to Ajax.googleapis.com and 6% (1 request) were made to Platform.twitter.com. The less responsive or slowest element that took the longest time to load (802 ms) relates to the external source Cognition.ens.fr.

Page Optimization Overview & Recommendations

Page size can be reduced by 33.1 kB (4%)

Content Size

878.4 kB

After Optimization

845.3 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Dec.ens.fr main page is 878.4 kB. 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. Images take 818.3 kB which makes up the majority of the site volume.

HTML Optimization

-72%

Potential reduce by 7.3 kB

  • Original 10.0 kB
  • After minification 8.0 kB
  • After compression 2.8 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. This page needs HTML code to be minified as it can gain 2.1 kB, which is 21% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 7.3 kB or 72% of the original size.

Image Optimization

-2%

Potential reduce by 12.7 kB

  • Original 818.3 kB
  • After minification 805.6 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. DEC Ens images are well optimized though.

JavaScript Optimization

-4%

Potential reduce by 1.3 kB

  • Original 35.8 kB
  • After minification 35.8 kB
  • After compression 34.5 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. This website has mostly compressed JavaScripts.

CSS Optimization

-83%

Potential reduce by 11.8 kB

  • Original 14.3 kB
  • After minification 10.3 kB
  • After compression 2.5 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. Dec.ens.fr needs all CSS files to be minified and compressed as it can save up to 11.8 kB or 83% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

16

After Optimization

16

  • Images
  • JavaScript
  • CSS

The browser has sent 16 CSS, Javascripts, AJAX and image requests in order to completely render the main page of DEC Ens. According to our analytics all requests are already optimized.

Network Requests Diagram

www.cognition.ens.fr

www.cognition.ens.fr

412 ms

stylesVersionFinale.css

stylesVersionFinale.css

83 ms

jquery.min.js

jquery.min.js

32 ms

responsiveslides.min.js

responsiveslides.min.js

162 ms

reset.css

reset.css

82 ms

widgets.js

widgets.js

36 ms

logoEns.png

logoEns.png

82 ms

DEC.png

DEC.png

637 ms

BJA.jpg

BJA.jpg

399 ms

BDFSC.jpg

BDFSC.jpg

480 ms

BIAEDEC.jpg

BIAEDEC.jpg

440 ms

medaille_bronze_2016.jpg

medaille_bronze_2016.jpg

161 ms

Enfant.png

Enfant.png

802 ms

ENS_logoDEC.png

ENS_logoDEC.png

478 ms

WensImage.png

WensImage.png

558 ms

twitter_20x20.png

twitter_20x20.png

520 ms

logos.png

logos.png

558 ms

Accessibility Review

dec.ens.fr accessibility score

98

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Best Practices

dec.ens.fr best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

dec.ens.fr SEO score

98

Search Engine Optimization Advices

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

    EN

  • Language Claimed

    FR

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Dec.ens.fr can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it does not match the claimed French language. Our system also found out that Dec.ens.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

dec.ens.fr

Open Graph description is not detected on the main page of DEC Ens. 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: