Tools & Wizards About Us

Report Summary

  • 18

    Performance

    Renders faster than
    34% of other websites

  • 98

    Accessibility

    Visual factors better than
    that of 94% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 98

    SEO

    Google-friendlier than
    92% of websites

lumiere.ens.fr

Homepage : DEC Département d'études cognitives

Page Load Speed

6.1 sec in total

First Response

331 ms

Resources Loaded

5.1 sec

Page Rendered

766 ms

About Website

Welcome to lumiere.ens.fr homepage info - get ready to check Lumiere Ens best content for France right away, or after learning these important things about lumiere.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 lumiere.ens.fr

Key Findings

We analyzed Lumiere.ens.fr page load time and found that the first response time was 331 ms and then it took 5.8 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.

Performance Metrics

lumiere.ens.fr performance score

18

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value14.0 s

0/100

10%

LCP (Largest Contentful Paint)

Value28.5 s

0/100

25%

SI (Speed Index)

Value19.3 s

0/100

10%

TBT (Total Blocking Time)

Value1,810 ms

9/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value31.3 s

0/100

10%

Network Requests Diagram

www.cognition.ens.fr

331 ms

cognition.ens.fr

425 ms

en

156 ms

en

177 ms

ajax-progress.module.css

152 ms

Our browser made a total of 175 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Lumiere.ens.fr, 10% (18 requests) were made to Use.typekit.net and 6% (11 requests) were made to Platform.twitter.com. The less responsive or slowest element that took the longest time to load (1 sec) relates to the external source Syndication.twitter.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 543.9 kB (33%)

Content Size

1.7 MB

After Optimization

1.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Lumiere.ens.fr main page is 1.7 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. 70% of websites need less resources to load. Images take 932.6 kB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 65.8 kB

  • Original 81.0 kB
  • After minification 76.9 kB
  • After compression 15.2 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 65.8 kB or 81% of the original size.

Image Optimization

-10%

Potential reduce by 91.1 kB

  • Original 932.6 kB
  • After minification 841.5 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. Lumiere Ens images are well optimized though.

JavaScript Optimization

-32%

Potential reduce by 75.3 kB

  • Original 234.1 kB
  • After minification 234.0 kB
  • After compression 158.7 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 75.3 kB or 32% of the original size.

CSS Optimization

-76%

Potential reduce by 311.7 kB

  • Original 411.3 kB
  • After minification 409.5 kB
  • After compression 99.6 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. Lumiere.ens.fr needs all CSS files to be minified and compressed as it can save up to 311.7 kB or 76% of the original size.

Requests Breakdown

Number of requests can be reduced by 129 (84%)

Requests Now

153

After Optimization

24

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 153 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Lumiere Ens. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 48 to 1 for JavaScripts and from 76 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

lumiere.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

lumiere.ens.fr best practices score

75

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

Missing source maps for large first-party JavaScript

SEO Factors

lumiere.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

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Lumiere.ens.fr can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Lumiere.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

Open Graph data is detected on the main page of Lumiere Ens. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: