URL substituted: You submitted https://persee.fr but we scanned https://www.persee.fr instead — the HTTPS certificate on the submitted hostname didn't cover that name, so we retried on the www. variant
Spain · Madrid Completed: Apr 22, 2026 22:52 UTCMobile 375 × 812
Desktop 1440 × 900
Score: 69 / 100
Based on 8 categories, 0 sections
Decent speed, but optimizing further could improve engagement.
Several missing protections leave your users and data exposed.
Several issues make your site difficult for assistive technology users.
Well-optimized for search — your content is discoverable.
Good server performance with room for optimization.
Mostly compliant — a few items need attention.
Missing metadata means poor previews on social media and search.
Heavier than average — reducing page weight saves energy and bandwidth.
The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.
Weights reflect general web best practices. Individual needs may differ.
Content-Security-Policy header is missing
Security gaps expose your site and users to attacks, eroding trust.
No Content-Security-Policy header found
Security gaps expose your site and users to attacks, eroding trust.
1 button(s) with no accessible text
Accessibility issues exclude users with disabilities — up to 15% of your potential audience.
11 link(s) with no accessible text
Accessibility issues exclude users with disabilities — up to 15% of your potential audience.
3 image(s) missing alt attribute
Accessibility issues exclude users with disabilities — up to 15% of your potential audience.
High impact, low effort — start here.
High impact, requires investment.
Small gains, minimal effort.
Nothing in this quadrant — good news.
Low impact, high effort — do last.
Nothing in this quadrant — good news.
[](https://beavercheck.com/results/1630058a-1e49-4581-9ba9-167feacc3123)<a href="https://beavercheck.com/results/1630058a-1e49-4581-9ba9-167feacc3123"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fpersee.fr" alt="BeaverCheck Score"></a>https://beavercheck.com/badge?url=https%3A%2F%2Fpersee.frThis badge auto-updates with your latest scan result.
Your site has several issues that may be affecting user experience and business outcomes. Accessibility issues exclude users who rely on assistive technology — an estimated 15% of your potential audience. Addressing the critical issues below would have the most immediate impact on your user trust.
7 barrier(s) likely increasing bounce by ~25%.
Page takes 16.7s to load
+12% bounceUsers abandon at ~3s — you're 14.2s over the 2.5s threshold
Fix: Optimize render-blocking resources, preload the hero image, and compress images
No Content-Security-Policy header
+1% bounceHigher XSS blast radius — one compromised script can exfiltrate the checkout form
Fix: Ship a reporting-only CSP first, then enforce once violations are clean
No Open Graph tags
+2% bounceLinks shared on LinkedIn / Slack / Facebook show bare URLs — referral clicks drop
Fix: Add og:title, og:description, og:image, og:url to the page head
No structured data
+2% bounceNo rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices
Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)
11 link(s) with generic text ("click here", "read more")
+1% bounceScreen-reader users navigating by link list see no context — and search engines can't infer relevance
Fix: Rewrite with descriptive phrases that identify the destination
No skip-to-content link
+1% bounceKeyboard and screen-reader users must tab through the entire header on every page
Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element
1 broken link(s) on the page
+2% bounceClicks land on 404s — trust drops and the session often ends
Fix: Fix or remove the broken destinations surfaced on the Content tab
Preliminary CRO audit — each barrier links to the tab with detailed analysis.
€440 investment → €0.79/month returns + EUR 120,500,000 risk avoided
€440
6h · 5 findings
€0.79 /mo
~€9.54 / year
EUR 120,500,000
if kept compliant
€80 — in quick wins — start here for the fastest payback
Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.
5.5 developer hours at €80/hr
Based on France rates (€80/hr)
Start here for the best return on investment
€10,041,667 / month at risk
~€120,500,010 / year if left unfixed
€120,500,000
+10 more
€0.79 /mo
10729.9 MB/mo × 0.074 EUR/GB
Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.
Unique monthly visitors from your analytics
Purchases, signups, or key actions
Optional — for revenue estimation
more engaged visitors from reduced bounce
Fix 5 critical issues to capture this value
Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.
Your site's LCP: → estimated after fixes.
These are estimates based on industry research — actual results vary
Your data stays in your browser — nothing is sent to our servers
Thanks for your feedback!
We'll use a cached audit if available, or offer to scan.
Industry-standard audits powered by Google Lighthouse.
Key metrics that affect user experience.
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
13.90 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
16.70 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
119 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
13.90 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
20.13 s
Audit breakdown by category with detailed findings.
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
Performance issues directly impact user engagement and conversion rates.
Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling
Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.
Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.
Source: Google web.dev / Lighthouse
3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.
Performance issues directly impact user engagement and conversion rates.
A long cache lifetime can speed up repeat visits to your page. Learn more about caching.
Performance issues directly impact user engagement and conversion rates.
| Request | Cache TTL | Transfer Size |
|---|---|---|
| /persee-search-portlet/webjars/font-awesome/7.0.0/webfont... | 0.0 ms | 99.3 KiB |
| www.persee.fr/persee-theme/css/fonts/ens/BebasNeueRegular-webfont.woff2 | 0.0 ms | 16.1 KiB |
| www.google-analytics.com/analytics.js | 7200.0 s | 20.9 KiB |
| www.persee.fr/persee-theme/css/fonts/ens/BebasNeueBold-webfont.woff2 | 0.0 ms | 15.5 KiB |
| /html/js/liferay/available_languages.jsp?browserId=other&... | 0.0 ms | 1010 B |
Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.
Performance issues directly impact user engagement and conversion rates.
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
div.persee_content-nobox > div.persee_content > div.content > img div.persee_content-nobox > div.persee_content > div.content > img | /documents/10099/1595712/Bandeau_RA2024.png/fc2d5a89-5408... | 245.5 KiB | 214.2 KiB |
div.persee_content > div.content > header#header-banner > section#banner | /documents/10099/1609937/bandeau_versa/fe5e99f9-73fb-4b11... | 158.2 KiB | 123.8 KiB |
Bluesky section#follow-us > p > a > img | /documents/10099/0/Bluesky_White.png/b483ef21-dbfc-4825-b... | 84.9 KiB | 84.8 KiB |
div.content > p > a > img div.content > p > a > img | /documents/10099/1367650/ehess.png/a1fc2282-9b58-4d7c-8f5... | 59.8 KiB | 54.5 KiB |
div.persee_content > div.content > a > img div.persee_content > div.content > a > img | /documents/10099/1367650/cbc.png/35c91685-2aae-4c3f-bb5c-... | 56.4 KiB | 51.4 KiB |
div.content > p > a > img div.content > p > a > img | /documents/10099/1367650/cls.png/391a0243-e2d2-4591-806c-... | 48.1 KiB | 42.3 KiB |
div.persee_content > div.content > p > img div.persee_content > div.content > p > img | /documents/10099/1595712/Bandeau_Keepers.png/d825d1ea-714... | 49.2 KiB | 29.2 KiB |
X section#follow-us > p > a > img | /documents/10099/0/X_logo_white.png/a20e15fc-1439-472b-94... | 27.5 KiB | 27.3 KiB |
CNRS section#partner > section#tutelles > a > img | www.persee.fr/static/LOGO_CNRS_BLEU.png | 18.6 KiB | 18.3 KiB |
Ministère de l'éducation nationale, de l'enseignement supérieur et de la recher… section#partner > section#financeur > a > img | /documents/10099/505733/MENESR_logo_portail.png/e9ae2f42-... | 18.5 KiB | 12.7 KiB |
persee.fr header#navi > section#site-title > a.logo > img | www.persee.fr/static/persee.png | 9.3 KiB | 4.6 KiB |
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Performance issues directly impact user engagement and conversion rates.
HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.
Performance issues directly impact user engagement and conversion rates.
Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
Performance issues directly impact user engagement and conversion rates.
Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Duration |
|---|---|---|
| /html/js/barebone.jsp?browserId=other&themeId=persee_WAR_... | 1.4 MiB | 12.8 s |
| /persee-theme/css/main.css?browserId=other&themeId=persee... | 362.2 KiB | 7.4 s |
| /html/portlet/journal/js/main.js?browserId=other&minifier... | 52.9 KiB | 2.7 s |
| /html/portlet/journal/js/navigation.js?browserId=other&mi... | 14.4 KiB | 1.2 s |
| /html/portlet/journal/css/main.css?browserId=other&themeI... | 21.6 KiB | 1.5 s |
| /persee-search-portlet/webjars/font-awesome/7.0.0/css/fon... | 56.4 KiB | 2.9 s |
| /persee-theme/css/aui.css?browserId=other&themeId=persee_... | 209.6 KiB | 5.7 s |
| /persee-search-portlet/webjars/font-awesome/7.0.0/css/bra... | 15.3 KiB | 1.2 s |
| /html/css/main.css?browserId=other&themeId=persee_WAR_per... | 143.5 KiB | 4.7 s |
| /html/portlet/asset_publisher/css/main.css?browserId=othe... | 6.6 KiB | 753 ms |
| /persee-search-portlet/webjars/font-awesome/7.0.0/css/sol... | 1.2 KiB | 453 ms |
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
Performance issues directly impact user engagement and conversion rates.
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.
Performance issues directly impact user engagement and conversion rates.
The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.
Performance issues directly impact user engagement and conversion rates.
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| /persee-theme/css/main.css?browserId=other&themeId=persee... | 362.2 KiB | 92.9 KiB |
| /persee-theme/css/aui.css?browserId=other&themeId=persee_... | 209.6 KiB | 48.4 KiB |
| /html/css/main.css?browserId=other&themeId=persee_WAR_per... | 143.5 KiB | 24.4 KiB |
| /html/portlet/journal/css/main.css?browserId=other&themeI... | 21.6 KiB | 3.0 KiB |
Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| /html/js/barebone.jsp?browserId=other&themeId=persee_WAR_... | 1.4 MiB | 894.4 KiB |
| /html/portlet/journal/js/main.js?browserId=other&minifier... | 52.2 KiB | 12.2 KiB |
| /combo/?browserId=other&minifierType=&languageId=fr_FR&b=... | 23.2 KiB | 4.4 KiB |
| /html/portlet/journal/js/navigation.js?browserId=other&mi... | 13.8 KiB | 2.8 KiB |
Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| /persee-theme/css/main.css?browserId=other&themeId=persee... | 361.6 KiB | 351.0 KiB |
| /persee-theme/css/aui.css?browserId=other&themeId=persee_... | 209.0 KiB | 201.2 KiB |
| /html/css/main.css?browserId=other&themeId=persee_WAR_per... | 142.8 KiB | 142.7 KiB |
| /persee-search-portlet/webjars/font-awesome/7.0.0/css/fon... | 55.8 KiB | 55.2 KiB |
| /html/portlet/journal/css/main.css?browserId=other&themeI... | 20.9 KiB | 20.9 KiB |
| /persee-search-portlet/webjars/font-awesome/7.0.0/css/bra... | 14.7 KiB | 14.4 KiB |
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.
Multi-megabyte JavaScript bundles delay every interactive feature on the page.
This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.
Source: Google web.dev / Lighthouse
| URL | Transfer Size | Est Savings |
|---|---|---|
| /html/js/barebone.jsp?browserId=other&themeId=persee_WAR_... | 1.4 MiB | 579.7 KiB |
| www.googletagmanager.com/gtag/js?id=G-4RE4X6PZER&cx=c&_slc=1 | 148.0 KiB | 64.1 KiB |
| /html/portlet/journal/js/main.js?browserId=other&minifier... | 52.2 KiB | 52.0 KiB |
Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache
Performance issues directly impact user engagement and conversion rates.
| Failure reason | Failure type |
|---|---|
| The page has an unload handler in the main frame. | Actionable |
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
Performance issues directly impact user engagement and conversion rates.
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
Performance issues directly impact user engagement and conversion rates.
| URL | |
|---|---|
persee.fr header#navi > section#site-title > a.logo > img | www.persee.fr/static/persee.png |
div.content > p > a > img div.content > p > a > img | /documents/10099/1367650/cls.png/391a0243-e2d2-4591-806c-... |
div.content > p > a > img div.content > p > a > img | /documents/10099/1367650/ehess.png/a1fc2282-9b58-4d7c-8f5... |
div.persee_content > div.content > a > img div.persee_content > div.content > a > img | /documents/10099/1367650/cbc.png/35c91685-2aae-4c3f-bb5c-... |
div.persee_news > p > a.picto > img.default-picto div.persee_news > p > a.picto > img.default-picto | www.persee.fr/persee-theme/images/picto/more-news-1.png |
More information about the performance of your application. These numbers don't directly affect the Performance score.
These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.
ARIA roles must have valid values in order to perform their intended accessibility functions. Learn more about valid ARIA roles.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
FR
EN body.persee > header#sidebar |
Informations
Au sujet de persee.fr
Votre collection sur persee.fr
Nous contac… div.persee_content-nobox > div.persee_content > div.content > footer#footer |
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Portail Persée body.persee > header#persee-headbar > a.a_css |
alités div.portlet-body > div.persee_news > h3 > span.perseePrimary |
en chiffres div.portlet-body > div#doc-count > h4.title > span.emphasis |
nous ? div.persee_content-nobox > div.persee_content > h4.title > span.perseePrimary |
Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
info.persee.fr div.persee_content > div.content > p > a |
info.persee.fr div.persee_content > div.content > p > a |
Publications de l'EHESS div.persee_content > div.content > p > a |
Les Jeux olympiques div.content > ul > li > a |
Les origines des jeux olympiques mythes et réalités div.content > ul > li > a |
Les jeux olympiques dans l'Antiquité div.content > ul > li > a |
Jeux Olympiques : du signal universel à la pluralité des images div.content > ul > li > a |
Jeux et enjeux olympiques div.content > ul > li > a |
Chiffres clés et premières analyses des Jeux olympiques et paralympiques div.content > ul > li > a |
Persée footer > footer#footer-small > section#copyright > a |
These are opportunities to improve the legibility of your content.
Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Persée en chiffres div.portlet-borderless-container > div.portlet-body > div#doc-count > h4.title |
These are opportunities to improve keyboard navigation in your application.
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.persee_news > p > a.picto > img.default-picto div.persee_news > p > a.picto > img.default-picto |
Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.content > header#header-banner > section#banner > a |
div.portlet-body > div.persee_news > p > a.picto div.portlet-body > div.persee_news > p > a.picto |
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
div.persee_content > div.content > p > a div.persee_content > div.content > p > a |
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
div.persee_content-withpic > div.persee_content > div.content > a div.persee_content-withpic > div.persee_content > div.content > a |
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
div.persee_content > div.content > p > a div.persee_content > div.content > p > a |
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.
Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Au sujet de persee.fr div.content > footer#footer > section#information > a |
Votre collection sur persee.fr div.content > footer#footer > section#information > a |
Interopérabilité div.content > footer#footer > section#resources > a |
Modèles documentaires div.content > footer#footer > section#resources > a |
Statistiques de consultation div.content > footer#footer > section#resources > a |
Kit logos div.content > footer#footer > section#resources > a |
CGU div.content > footer#footer > section#misc > a |
Mentions légales div.content > footer#footer > section#misc > a |
Crédits div.content > footer#footer > section#misc > a |
Politique d'archivage pérenne div.content > footer#footer > section#misc > a |
These items highlight common accessibility best practices.
Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.
Performance issues directly impact user engagement and conversion rates.
| URL | Displayed size | Actual size | Expected size | |
|---|---|---|---|---|
Ministère de l'éducation nationale, de l'enseignement supérieur et de la recher… section#partner > section#financeur > a > img | /documents/10099/505733/MENESR_logo_portail.png/e9ae2f42-... | 200 x 177 | 200 x 177 | 300 x 266 |
Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.
Performance issues directly impact user engagement and conversion rates.
| Deprecation / Warning | Source |
|---|---|
| Unload event listeners are deprecated and will be removed. | /html/js/barebone.jsp?browserId=other&themeId=persee_WAR_... line 182, col 19 |
Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.
Performance issues directly impact user engagement and conversion rates.
These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.
Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable
Performance issues directly impact user engagement and conversion rates.
| Uncrawlable Link |
|---|
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
To appear in search results, crawlers need access to your app.
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.persee_news > p > a.picto > img.default-picto div.persee_news > p > a.picto > img.default-picto |
Format your HTML in a way that enables crawlers to better understand your app’s content.
Industry-standard audits powered by Google Lighthouse. — Desktop
Key metrics that affect user experience. — Desktop
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.44 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.53 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.034
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.44 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
3.54 s
Audit breakdown by category with detailed findings.
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
Performance issues directly impact user engagement and conversion rates.
Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling
Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.
Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.
Source: Google web.dev / Lighthouse
3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.
Performance issues directly impact user engagement and conversion rates.
A long cache lifetime can speed up repeat visits to your page. Learn more about caching.
Performance issues directly impact user engagement and conversion rates.
| Request | Cache TTL | Transfer Size |
|---|---|---|
| /persee-search-portlet/webjars/font-awesome/7.0.0/webfont... | 0.0 ms | 99.3 KiB |
| www.persee.fr/persee-theme/css/fonts/ens/BebasNeueRegular-webfont.woff2 | 0.0 ms | 16.1 KiB |
| www.google-analytics.com/analytics.js | 7200.0 s | 20.9 KiB |
| www.persee.fr/persee-theme/css/fonts/ens/BebasNeueBold-webfont.woff2 | 0.0 ms | 15.5 KiB |
| /html/js/liferay/available_languages.jsp?browserId=other&... | 0.0 ms | 1010 B |
Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.
Performance issues directly impact user engagement and conversion rates.
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
div.persee_content-nobox > div.persee_content > div.content > img div.persee_content-nobox > div.persee_content > div.content > img | /documents/10099/1595712/Bandeau_RA2024.png/fc2d5a89-5408... | 245.5 KiB | 235.6 KiB |
div.persee_content > div.content > header#header-banner > section#banner | /documents/10099/1609937/bandeau_versa/fe5e99f9-73fb-4b11... | 158.2 KiB | 123.8 KiB |
Bluesky section#follow-us > p > a > img | /documents/10099/0/Bluesky_White.png/b483ef21-dbfc-4825-b... | 84.9 KiB | 84.9 KiB |
div.content > p > a > img div.content > p > a > img | /documents/10099/1367650/ehess.png/a1fc2282-9b58-4d7c-8f5... | 59.8 KiB | 54.5 KiB |
div.persee_content > div.content > a > img div.persee_content > div.content > a > img | /documents/10099/1367650/cbc.png/35c91685-2aae-4c3f-bb5c-... | 56.4 KiB | 51.4 KiB |
div.persee_content > div.content > p > img div.persee_content > div.content > p > img | /documents/10099/1595712/Bandeau_Keepers.png/d825d1ea-714... | 49.2 KiB | 42.9 KiB |
div.content > p > a > img div.content > p > a > img | /documents/10099/1367650/cls.png/391a0243-e2d2-4591-806c-... | 48.1 KiB | 42.3 KiB |
X section#follow-us > p > a > img | /documents/10099/0/X_logo_white.png/a20e15fc-1439-472b-94... | 27.5 KiB | 27.4 KiB |
CNRS section#partner > section#tutelles > a > img | www.persee.fr/static/LOGO_CNRS_BLEU.png | 18.6 KiB | 18.5 KiB |
Ministère de l'éducation nationale, de l'enseignement supérieur et de la recher… section#partner > section#financeur > a > img | /documents/10099/505733/MENESR_logo_portail.png/e9ae2f42-... | 18.5 KiB | 12.7 KiB |
persee.fr header#navi > section#site-title > a.logo > img | www.persee.fr/static/persee.png | 9.3 KiB | 7.8 KiB |
ENS Lyon section#partner > section#tutelles > a > img | /documents/10099/505733/ENS_2024-11/1a6cc584-1c59-4629-9c... | 4.2 KiB | 4.1 KiB |
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Performance issues directly impact user engagement and conversion rates.
HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.
Performance issues directly impact user engagement and conversion rates.
Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
Performance issues directly impact user engagement and conversion rates.
Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Duration |
|---|---|---|
| /html/js/barebone.jsp?browserId=other&themeId=persee_WAR_... | 1.4 MiB | 2.2 s |
| /persee-theme/css/main.css?browserId=other&themeId=persee... | 362.2 KiB | 1.3 s |
| /html/portlet/journal/js/main.js?browserId=other&minifier... | 52.9 KiB | 483 ms |
| /html/portlet/journal/js/navigation.js?browserId=other&mi... | 14.4 KiB | 203 ms |
| /html/portlet/journal/css/main.css?browserId=other&themeI... | 21.6 KiB | 323 ms |
| /persee-search-portlet/webjars/font-awesome/7.0.0/css/fon... | 56.4 KiB | 523 ms |
| /persee-theme/css/aui.css?browserId=other&themeId=persee_... | 209.6 KiB | 1.0 s |
| /persee-search-portlet/webjars/font-awesome/7.0.0/css/bra... | 15.3 KiB | 243 ms |
| /html/css/main.css?browserId=other&themeId=persee_WAR_per... | 143.5 KiB | 843 ms |
| /html/portlet/asset_publisher/css/main.css?browserId=othe... | 6.6 KiB | 163 ms |
| /persee-search-portlet/webjars/font-awesome/7.0.0/css/sol... | 1.2 KiB | 123 ms |
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
Performance issues directly impact user engagement and conversion rates.
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.
Performance issues directly impact user engagement and conversion rates.
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| /persee-theme/css/main.css?browserId=other&themeId=persee... | 362.2 KiB | 92.9 KiB |
| /persee-theme/css/aui.css?browserId=other&themeId=persee_... | 209.6 KiB | 48.4 KiB |
| /html/css/main.css?browserId=other&themeId=persee_WAR_per... | 143.5 KiB | 24.4 KiB |
| /html/portlet/journal/css/main.css?browserId=other&themeI... | 21.6 KiB | 3.0 KiB |
Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| /html/js/barebone.jsp?browserId=other&themeId=persee_WAR_... | 1.4 MiB | 894.4 KiB |
| /html/portlet/journal/js/main.js?browserId=other&minifier... | 52.2 KiB | 12.2 KiB |
| /combo/?browserId=other&minifierType=&languageId=fr_FR&b=... | 23.2 KiB | 4.4 KiB |
| /html/portlet/journal/js/navigation.js?browserId=other&mi... | 13.8 KiB | 2.8 KiB |
Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| /persee-theme/css/main.css?browserId=other&themeId=persee... | 361.6 KiB | 349.5 KiB |
| /persee-theme/css/aui.css?browserId=other&themeId=persee_... | 209.0 KiB | 200.6 KiB |
| /html/css/main.css?browserId=other&themeId=persee_WAR_per... | 142.8 KiB | 142.8 KiB |
| /persee-search-portlet/webjars/font-awesome/7.0.0/css/fon... | 55.8 KiB | 55.2 KiB |
| /html/portlet/journal/css/main.css?browserId=other&themeI... | 20.9 KiB | 20.9 KiB |
| /persee-search-portlet/webjars/font-awesome/7.0.0/css/bra... | 14.7 KiB | 14.4 KiB |
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.
Multi-megabyte JavaScript bundles delay every interactive feature on the page.
This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.
Source: Google web.dev / Lighthouse
| URL | Transfer Size | Est Savings |
|---|---|---|
| /html/js/barebone.jsp?browserId=other&themeId=persee_WAR_... | 1.4 MiB | 590.8 KiB |
| www.googletagmanager.com/gtag/js?id=G-4RE4X6PZER&cx=c&_slc=1 | 148.0 KiB | 64.1 KiB |
| /html/portlet/journal/js/main.js?browserId=other&minifier... | 52.2 KiB | 52.0 KiB |
Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache
Performance issues directly impact user engagement and conversion rates.
| Failure reason | Failure type |
|---|---|
| The page has an unload handler in the main frame. | Actionable |
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
Performance issues directly impact user engagement and conversion rates.
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
Performance issues directly impact user engagement and conversion rates.
| URL | |
|---|---|
persee.fr header#navi > section#site-title > a.logo > img | www.persee.fr/static/persee.png |
div.content > p > a > img div.content > p > a > img | /documents/10099/1367650/cls.png/391a0243-e2d2-4591-806c-... |
div.content > p > a > img div.content > p > a > img | /documents/10099/1367650/ehess.png/a1fc2282-9b58-4d7c-8f5... |
div.persee_content > div.content > a > img div.persee_content > div.content > a > img | /documents/10099/1367650/cbc.png/35c91685-2aae-4c3f-bb5c-... |
div.persee_news > p > a.picto > img.default-picto div.persee_news > p > a.picto > img.default-picto | www.persee.fr/persee-theme/images/picto/more-news-1.png |
More information about the performance of your application. These numbers don't directly affect the Performance score.
These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.
ARIA roles must have valid values in order to perform their intended accessibility functions. Learn more about valid ARIA roles.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
FR
EN body.persee > header#sidebar |
Informations
Au sujet de persee.fr
Votre collection sur persee.fr
Nous contac… div.persee_content-nobox > div.persee_content > div.content > footer#footer |
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Portail Persée body.persee > header#persee-headbar > a.a_css |
alités div.portlet-body > div.persee_news > h3 > span.perseePrimary |
en chiffres div.portlet-body > div#doc-count > h4.title > span.emphasis |
nous ? div.persee_content-nobox > div.persee_content > h4.title > span.perseePrimary |
Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
info.persee.fr div.persee_content > div.content > p > a |
info.persee.fr div.persee_content > div.content > p > a |
Publications de l'EHESS div.persee_content > div.content > p > a |
Les Jeux olympiques div.content > ul > li > a |
Les origines des jeux olympiques mythes et réalités div.content > ul > li > a |
Les jeux olympiques dans l'Antiquité div.content > ul > li > a |
Jeux Olympiques : du signal universel à la pluralité des images div.content > ul > li > a |
Jeux et enjeux olympiques div.content > ul > li > a |
Chiffres clés et premières analyses des Jeux olympiques et paralympiques div.content > ul > li > a |
Persée footer > footer#footer-small > section#copyright > a |
These are opportunities to improve the legibility of your content.
Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Persée en chiffres div.portlet-borderless-container > div.portlet-body > div#doc-count > h4.title |
These are opportunities to improve keyboard navigation in your application.
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.persee_news > p > a.picto > img.default-picto div.persee_news > p > a.picto > img.default-picto |
Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.content > header#header-banner > section#banner > a |
div.portlet-body > div.persee_news > p > a.picto div.portlet-body > div.persee_news > p > a.picto |
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
div.persee_content > div.content > p > a div.persee_content > div.content > p > a |
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
div.persee_content-withpic > div.persee_content > div.content > a div.persee_content-withpic > div.persee_content > div.content > a |
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
div.persee_content > div.content > p > a div.persee_content > div.content > p > a |
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.
Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Au sujet de persee.fr div.content > footer#footer > section#information > a |
Votre collection sur persee.fr div.content > footer#footer > section#information > a |
Interopérabilité div.content > footer#footer > section#resources > a |
Modèles documentaires div.content > footer#footer > section#resources > a |
Statistiques de consultation div.content > footer#footer > section#resources > a |
Kit logos div.content > footer#footer > section#resources > a |
CGU div.content > footer#footer > section#misc > a |
Mentions légales div.content > footer#footer > section#misc > a |
Crédits div.content > footer#footer > section#misc > a |
Politique d'archivage pérenne div.content > footer#footer > section#misc > a |
These items highlight common accessibility best practices.
Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.
Performance issues directly impact user engagement and conversion rates.
| URL | Aspect Ratio (Displayed) | Aspect Ratio (Actual) | |
|---|---|---|---|
div.persee_content-nobox > div.persee_content > div.content > img div.persee_content-nobox > div.persee_content > div.content > img | /documents/10099/1595712/Bandeau_RA2024.png/fc2d5a89-5408... | 290 x 209 (1.39) | 690 x 480 (1.44) |
div.persee_content > div.content > p > img div.persee_content > div.content > p > img | /documents/10099/1595712/Bandeau_Keepers.png/d825d1ea-714... | 290 x 134 (2.16) | 670 x 300 (2.23) |
Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.
Performance issues directly impact user engagement and conversion rates.
| Deprecation / Warning | Source |
|---|---|
| Unload event listeners are deprecated and will be removed. | /html/js/barebone.jsp?browserId=other&themeId=persee_WAR_... line 182, col 19 |
Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.
Performance issues directly impact user engagement and conversion rates.
These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.
Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable
Performance issues directly impact user engagement and conversion rates.
| Uncrawlable Link |
|---|
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
div.persee_content-withpic > div.persee_content > h4.title > a div.persee_content-withpic > div.persee_content > h4.title > a |
To appear in search results, crawlers need access to your app.
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.persee_news > p > a.picto > img.default-picto div.persee_news > p > a.picto > img.default-picto |
Format your HTML in a way that enables crawlers to better understand your app’s content.
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