Tools & Wizards About Us
irfu.cea.fr screenshot

Report Summary

  • 40

    Performance

    Renders faster than
    59% of other websites

  • 82

    Accessibility

    Visual factors better than
    that of 52% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 99

    SEO

    Google-friendlier than
    93% of websites

irfu.cea.fr

L'Irfu, Institut de Recherche sur les lois Fondamentales de l'Univers

Page Load Speed

8.6 sec in total

First Response

346 ms

Resources Loaded

7.7 sec

Page Rendered

562 ms

irfu.cea.fr screenshot

About Website

Visit irfu.cea.fr now to see the best up-to-date Irfu Cea content for France and also check out these interesting facts you probably never knew about irfu.cea.fr

L'IRFU est un institut du CEA/Saclay. Ses recherches portent sur les lois fondamentales de l'Univers. Astrophysique, physique nucléaire et physique des particules, l'infiniment grand et l'infiniment p...

Visit irfu.cea.fr

Key Findings

We analyzed Irfu.cea.fr page load time and found that the first response time was 346 ms and then it took 8.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.

Performance Metrics

irfu.cea.fr performance score

40

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.6 s

31/100

10%

LCP (Largest Contentful Paint)

Value15.8 s

0/100

25%

SI (Speed Index)

Value10.7 s

7/100

10%

TBT (Total Blocking Time)

Value70 ms

99/100

30%

CLS (Cumulative Layout Shift)

Value0.379

28/100

15%

TTI (Time to Interactive)

Value10.7 s

23/100

10%

Network Requests Diagram

irfu.cea.fr

346 ms

irfu.cea.fr

965 ms

bootstrap.min.css

326 ms

all.css

251 ms

tempusdominus-bootstrap-4.min.css

250 ms

Our browser made a total of 90 requests to load all elements on the main page. We found that 97% of them (87 requests) were addressed to the original Irfu.cea.fr, 3% (3 requests) were made to Fonts.googleapis.com. The less responsive or slowest element that took the longest time to load (4 sec) belongs to the original domain Irfu.cea.fr.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.1 MB (14%)

Content Size

7.6 MB

After Optimization

6.5 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Irfu.cea.fr main page is 7.6 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. 55% of websites need less resources to load. Images take 7.3 MB which makes up the majority of the site volume.

HTML Optimization

-85%

Potential reduce by 67.7 kB

  • Original 79.3 kB
  • After minification 60.9 kB
  • After compression 11.6 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 18.4 kB, which is 23% 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 67.7 kB or 85% of the original size.

Image Optimization

-13%

Potential reduce by 969.5 kB

  • Original 7.3 MB
  • After minification 6.3 MB

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. Obviously, Irfu Cea needs image optimization as it can save up to 969.5 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-12%

Potential reduce by 20.2 kB

  • Original 166.8 kB
  • After minification 166.8 kB
  • After compression 146.6 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 20.2 kB or 12% of the original size.

CSS Optimization

-10%

Potential reduce by 5.3 kB

  • Original 51.9 kB
  • After minification 51.9 kB
  • After compression 46.6 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. Irfu.cea.fr has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 16 (19%)

Requests Now

84

After Optimization

68

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 84 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Irfu Cea. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 to 1 for JavaScripts and from 9 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

irfu.cea.fr

irfu.cea.fr

346 ms

irfu.cea.fr

irfu.cea.fr

965 ms

bootstrap.min.css

bootstrap.min.css

326 ms

all.css

all.css

251 ms

tempusdominus-bootstrap-4.min.css

tempusdominus-bootstrap-4.min.css

250 ms

global.css

global.css

245 ms

phocea.css

phocea.css

245 ms

jquery-3.4.1.min.js

jquery-3.4.1.min.js

405 ms

tarteaucitron.js

tarteaucitron.js

486 ms

tarteaucitron.js

tarteaucitron.js

565 ms

popper.min.js

popper.min.js

495 ms

bootstrap.min.js

bootstrap.min.js

497 ms

moment.min.js

moment.min.js

644 ms

moment-with-locales.js

moment-with-locales.js

810 ms

tempusdominus-bootstrap-4.min.js

tempusdominus-bootstrap-4.min.js

726 ms

css

css

29 ms

css

css

45 ms

css

css

23 ms

background-CEA.jpg

background-CEA.jpg

384 ms

ImageIrfu-Int-tronquee.png

ImageIrfu-Int-tronquee.png

905 ms

IRFU.png

IRFU.png

246 ms

home.png

home.png

297 ms

Stephans-Quintet-MIRI-Image-H465-rognee.png

Stephans-Quintet-MIRI-Image-H465-rognee.png

1014 ms

mr_4964_1-ISEULT-H465-rognee.jpg

mr_4964_1-ISEULT-H465-rognee.jpg

701 ms

CMStunnel-redim.jpg

CMStunnel-redim.jpg

720 ms

scanpyramids-redim.jpg

scanpyramids-redim.jpg

935 ms

RFQ-redim.jpg

RFQ-redim.jpg

942 ms

cms-redim.jpg

cms-redim.jpg

1259 ms

Euclid-esa-redim.jpg

Euclid-esa-redim.jpg

1042 ms

Gbar-redim.jpg

Gbar-redim.jpg

1781 ms

nectar-elec-redim.jpg

nectar-elec-redim.jpg

1493 ms

RFQ2-redim.jpg

RFQ2-redim.jpg

1579 ms

nectarCam-redim.jpg

nectarCam-redim.jpg

1573 ms

MINOS.jpg

MINOS.jpg

1598 ms

camera1-redim.jpg

camera1-redim.jpg

1817 ms

camera-spatial-redim.jpg

camera-spatial-redim.jpg

1892 ms

alice_fiber-redim.jpg

alice_fiber-redim.jpg

2131 ms

caliste-redim.jpg

caliste-redim.jpg

2138 ms

agata-redim.jpg

agata-redim.jpg

1997 ms

image2.jpg

image2.jpg

2502 ms

image1.jpg

image1.jpg

2376 ms

title-block-more.gif

title-block-more.gif

2134 ms

5250_2.png

5250_2.png

3903 ms

mr_5255_1.jpg

mr_5255_1.jpg

2609 ms

mr_5252_2.jpg

mr_5252_2.jpg

2452 ms

mr_5249_1.jpg

mr_5249_1.jpg

2615 ms

Modele-standard-2521_230-219.jpg

Modele-standard-2521_230-219.jpg

2616 ms

accelerateur-enceinte-cryogenique230-219.jpg

accelerateur-enceinte-cryogenique230-219.jpg

2770 ms

Photo-Irfu-Mat-Noire2521_230-219.jpg

Photo-Irfu-Mat-Noire2521_230-219.jpg

2741 ms

if_linkedin_square_color_107091.png

if_linkedin_square_color_107091.png

2849 ms

facebook.png

facebook.png

2816 ms

fa-solid-900.woff

fa-solid-900.woff

3121 ms

fa-regular-400.woff

fa-regular-400.woff

2930 ms

twitter.png

twitter.png

2772 ms

mail.png

mail.png

2848 ms

news_defaut.jpg

news_defaut.jpg

2802 ms

9158.png

9158.png

3588 ms

Plans-acces-Irfu-N-rog.png

Plans-acces-Irfu-N-rog.png

2606 ms

Postes-stages-theses132.png

Postes-stages-theses132.png

2613 ms

univs2-ups.png

univs2-ups.png

2433 ms

labex-rog-partenaires.png

labex-rog-partenaires.png

2484 ms

euclid-premiere-image.png

euclid-premiere-image.png

3440 ms

euclid.jpg

euclid.jpg

2717 ms

DEFIS-246.PNG

DEFIS-246.PNG

4046 ms

DEFIS-245.PNG

DEFIS-245.PNG

3593 ms

Les-dix-Mille-et-Une-Nuits-de-l-univers-200-300.jpg

Les-dix-Mille-et-Une-Nuits-de-l-univers-200-300.jpg

2479 ms

Les-accelerateurs-l-homme-et-l-univers-230-300.jpg

Les-accelerateurs-l-homme-et-l-univers-230-300.jpg

2575 ms

Groupes-de-symetrie-en-physique-230-300.jpg

Groupes-de-symetrie-en-physique-230-300.jpg

2632 ms

Particules-et-noyaux-230-300.jpg

Particules-et-noyaux-230-300.jpg

2614 ms

Pourquoi-le-Soleil-brille-230-300.jpg

Pourquoi-le-Soleil-brille-230-300.jpg

2607 ms

Plume-Mansoulie-200-300.jpg

Plume-Mansoulie-200-300.jpg

2717 ms

Plume-Elbaz-9782738134776-230-300.jpg

Plume-Elbaz-9782738134776-230-300.jpg

2641 ms

Plumes-bonnet-bideau-70113652-230-300.jpg

Plumes-bonnet-bideau-70113652-230-300.jpg

2783 ms

Plumes-CohenT-Spiro-41qBaLVmMSL-230-300.jpg

Plumes-CohenT-Spiro-41qBaLVmMSL-230-300.jpg

2656 ms

Plumes-Klein-41qBaLVmMSL-rogneV10-230-300.jpg

Plumes-Klein-41qBaLVmMSL-rogneV10-230-300.jpg

2719 ms

Plumes-Lehoucq-minipommier-61iq6z7omuL-230-300.jpg

Plumes-Lehoucq-minipommier-61iq6z7omuL-230-300.jpg

2716 ms

Plumes-aventure-du-grand-collisionneur-LHC-rogne-230-301.jpg

Plumes-aventure-du-grand-collisionneur-LHC-rogne-230-301.jpg

2723 ms

PlumesBontemps-lehoucq-230-300.jpg

PlumesBontemps-lehoucq-230-300.jpg

2733 ms

Plumes-Marco-Zito-Partic-230-300.jpg

Plumes-Marco-Zito-Partic-230-300.jpg

2746 ms

Plumes-Bernard-Fernadez-230-300.jpg

Plumes-Bernard-Fernadez-230-300.jpg

2560 ms

Plumes-debu-noyaux-230-300.jpg

Plumes-debu-noyaux-230-300.jpg

2557 ms

navdropdown_typologies-CEA-feuilleter.png

navdropdown_typologies-CEA-feuilleter.png

2709 ms

icon-rss.png

icon-rss.png

2597 ms

haut-fleche.png

haut-fleche.png

2639 ms

Les-accelerateurs-l-homme-et-l-univers-200-300.jpg

Les-accelerateurs-l-homme-et-l-univers-200-300.jpg

1266 ms

Groupes-de-symetrie-en-physique-200-300.jpg

Groupes-de-symetrie-en-physique-200-300.jpg

1376 ms

Particules-et-noyaux-200-300.jpg

Particules-et-noyaux-200-300.jpg

1279 ms

Pourquoi-le-Soleil-brille-200-300.jpg

Pourquoi-le-Soleil-brille-200-300.jpg

1180 ms

tarteaucitron.css

tarteaucitron.css

112 ms

tarteaucitron.en.js

tarteaucitron.en.js

241 ms

Accessibility Review

irfu.cea.fr accessibility score

82

Accessibility Issues

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.

Impact

Issue

High

Buttons do not have an accessible name

High

Form elements do not have associated labels

High

Links do not have a discernible name

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

irfu.cea.fr best practices score

58

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

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

irfu.cea.fr SEO score

99

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

    FR

  • Language Claimed

    FR

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Irfu.cea.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 Irfu.cea.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

irfu.cea.fr

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