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Audit Complete

Results for https://psl.eu

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FR · EUR (€) · Estimated Applicable regulations: RGPD · ePrivacy Directive · EAA Dev cost: €80/hr How jurisdiction is detected
United Stated United Stated · New York Completed: Apr 22, 2026 23:25 UTC
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Mobile 375 × 812

Screenshot of the audited page (Mobile 375×812)
C70

Site Health

Score: 70 / 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.

Solid SEO basics — a few optimizations could boost rankings.

Solid infrastructure — fast server responses across the board.

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.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

Drupal · 362 peers
You 70
·
Avg 73
At average
0 50 100
Better than 6% of Drupal sites See full Drupal benchmark →
Debian · 13 peers
You 70
·
Avg 73
At average
0 50 100
Better than 7% of Debian sites See full Debian benchmark →

Top Priorities (5)

1

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers
2

Cookie 'cookiesession1' is missing the Secure flag

Security gaps expose your site and users to attacks, eroding trust.

Security › Cookie Security
3

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy
4

Page weighs 7.7 MB (6.5 MB transferred)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Budget
5

2 image(s) missing alt attribute

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Alt Text Quality
View fix priority matrix

Fix Priority Matrix

5 findings

Quick Wins

3

High impact, low effort — start here.

Strategic

2

High impact, requires investment.

Easy Improvements

0

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

0

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →
BeaverCheck badge
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<a href="https://beavercheck.com/results/1d5e5689-112d-4a36-9a65-473a770559d6"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fpsl.eu" alt="BeaverCheck Score"></a>
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This badge auto-updates with your latest scan result.

What fixing these means

Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Your LCP of 8.8s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. Addressing the critical issues below would have the most immediate impact on your user trust.

3 security gaps detected — browsers may warn visitors about your site.
Your LCP is 8.8s — fixing the 1 performance critical could bring it under Google's 2.5s 'Good' threshold.
1 accessibility issue excludes users who rely on assistive technology.

Conversion Barriers

1 critical 7 warning

8 barrier(s) likely increasing bounce by ~28%.

Speed (1)

Page takes 8.8s to load

+12% bounce

Users abandon at ~3s — you're 6.3s over the 2.5s threshold

Fix: Optimize render-blocking resources, preload the hero image, and compress images

Trust (2)

No HSTS header

+1% bounce

Returning visitors are briefly exposed to downgrade attacks on first request

Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains

No Content-Security-Policy header

+1% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Usability (1)

Viewport disables user zoom

+2% bounce

Visitors with low vision can't read the page — and some jurisdictions treat this as a legal risk

Fix: Remove user-scalable=no; drop maximum-scale if it's below 2

Content (3)

No Open Graph tags

+2% bounce

Links 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% bounce

No 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, …)

Thin content

+3% bounce

Under 300 words — visitors bounce looking for substance, search engines rank competitors first

Fix: Add a substantive FAQ, product detail, or case-study section

Navigation (1)

No skip-to-content link

+1% bounce

Keyboard 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

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

€400 investment → €5,392/month returns + EUR 120,500,000 risk avoided

Payback period: < 1 month First-year ROI: +16077%

Investment

€400

5h · 5 findings

Monthly returns

€5,392 /mo

~€64,708 / year

  • Conversions recovered €5,391
  • Bandwidth savings €1.52

Regulatory risk avoided

EUR 120,500,000

if kept compliant

  • ePrivacy Directive EUR 100,000,000
  • RGPD EUR 20,000,000
  • EAA EUR 500,000

Payback period

0 12mo 24mo

€120 — 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.

Full methodology & sources

Estimated Remediation Cost

€400

5.0 developer hours at €80/hr

Based on France rates (€80/hr)

Quick wins
€120 3 fixes in ~90 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions
/hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

€10,041,668 / month at risk

~€120,500,018 / year if left unfixed

Compliance Risk

€120,500,000

ePrivacy DirectiveRGPDEAA
  • No privacy policy link detected
    RGPD: EUR 10,000 – EUR 20,000,000
  • Trackers detected but no cookie policy found
    RGPD: EUR 5,000 – EUR 10,000,000
  • Trackers detected but no cookie policy found
    RGPD: EUR 10,000 – EUR 20,000,000

+7 more

Bandwidth Waste

€1.52 /mo

20526.5 MB/mo × 0.074 EUR/GB

  • Optimize transfer: save ~2.1 MB per page load
    Saves €1.52/mo

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.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Unique monthly visitors from your analytics

Purchases, signups, or key actions

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue
Current bounce (est.)
After fixes (est.)
Estimated bounce reduction

Fix 5 critical issues to capture this value

How this is calculated

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

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

Was this report useful?

Thanks for your feedback!

We'll use a cached audit if available, or offer to scan.

Checking for existing audit...

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

64
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

Core Web Vitals

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.

3.50 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

8.75 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

90 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.001

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

5.70 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.

8.89 s

Detailed Report

Audit breakdown by category with detailed findings.

64

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

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

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more

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.

Why this matters

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
static.psl.eu/sites/default/files/2025-04/slider_hp_4.png0.0 ms1.2 MiB
static.psl.eu/sites/default/files/2020-10/capture12.png0.0 ms1.2 MiB
static.psl.eu/sites/default/files/2025-05/54380820552_543c183b44_k.jpg0.0 ms1.1 MiB
static.psl.eu/sites/default/files/2025-09/images_actu_1.png0.0 ms567.6 KiB
static.psl.eu/sites/default/files/2025-10/marie_curie_grevin.png0.0 ms432.7 KiB
static.psl.eu/sites/default/files/2026-04/logo_eelisa_eu_cmyk_neg.svg0.0 ms412.5 KiB
static.psl.eu/sites/default/files/2025-04/establishments.svg0.0 ms336.0 KiB
static.psl.eu/sites/default/files/2025-05/54455527836_4097ab3587_c.jpg0.0 ms129.6 KiB
static.psl.eu/sites/default/files/2025-04/bandeau_1920x1080.jpg0.0 ms114.9 KiB
static.psl.eu/sites/default/files/2025-04/site.jpg0.0 ms112.7 KiB
/sites/default/files/2026-04/slider_journee_etudes_matiss...0.0 ms96.6 KiB
static.psl.eu/sites/default/files/2025-04/photodune-6389776-uranus-m.jpg0.0 ms96.3 KiB
static.psl.eu/sites/default/files/2025-03/gabarit_images_articlesactus_7.jpg0.0 ms79.8 KiB
static.psl.eu/sites/default/files/2025-03/slider_labelbienvenueenfrance2025.jpg0.0 ms72.7 KiB
static.psl.eu/sites/default/files/2025-10/campus_tour_vignetteyt.jpg0.0 ms69.1 KiB
psl.eu/themes/custom/oooooo/assets/js/bundles/slider.bundle.js0.0 ms41.3 KiB
psl.eu/themes/custom/oooooo/assets/js/oooooo.script.js?tdefyf0.0 ms40.0 KiB
/sites/default/files/2026-04/actu_instrument_majis_missio...0.0 ms37.2 KiB
matomo.psl.eu/js/container_hiK0OYeY.js0.0 ms37.2 KiB
/sites/default/files/2026-04/actu_dopamine_organisation_s...0.0 ms31.0 KiB
psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.10.0 ms30.0 KiB
psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-medium.woff20.0 ms23.7 KiB
psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-light.woff20.0 ms23.7 KiB
psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-bold.woff20.0 ms23.7 KiB
psl.eu/themes/custom/oooooo/assets/css/oooooo.style.css?tdefyf0.0 ms20.1 KiB
static.psl.eu/sites/default/files/2025-04/logotype-blanc.svg0.0 ms20.1 KiB
psl.eu/core/misc/ajax.js?v=10.5.60.0 ms17.1 KiB
static.psl.eu/sites/default/files/2025-04/students.svg0.0 ms13.5 KiB
static.psl.eu/sites/default/files/2025-04/students_0.svg0.0 ms13.5 KiB
static.psl.eu/sites/default/files/2025-04/laboratories.svg0.0 ms11.7 KiB
psl.eu/themes/custom/oooooo/assets/images/logo.svg0.0 ms9.6 KiB
psl.eu/themes/custom/oooooo/assets/js/bundles/selectbox.bundle.js0.0 ms9.0 KiB
psl.eu/themes/custom/oooooo/assets/fonts/iconfont/iconfont.woff20.0 ms7.6 KiB
psl.eu/core/misc/drupal.js?v=10.5.60.0 ms6.5 KiB
/modules/contrib/eu_cookie_compliance/js/eu_cookie_compli...0.0 ms5.8 KiB
/sites/default/files/languages/fr_G_wxD3PjXiNucpUiMwQwyUB...0.0 ms5.6 KiB
static.psl.eu/sites/default/files/2025-04/logo-footer.svg0.0 ms5.5 KiB
psl.eu/themes/custom/oooooo/components/01-quarks/swiper/swiper.css?tdefyf0.0 ms3.2 KiB
psl.eu/themes/custom/oooooo/assets/images/hp_formation.svg0.0 ms3.2 KiB
psl.eu/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.00.0 ms2.8 KiB
psl.eu/core/misc/message.js?v=10.5.60.0 ms2.8 KiB
psl.eu/core/misc/progress.js?v=10.5.60.0 ms2.1 KiB
psl.eu/core/misc/announce.js?v=10.5.60.0 ms2.0 KiB
psl.eu/modules/contrib/eu_cookie_compliance/css/eu_cookie_compliance.css?tdefyf0.0 ms1.7 KiB
psl.eu/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.00.0 ms1.3 KiB
psl.eu/core/assets/vendor/js-cookie/js.cookie.min.js?v=3.0.50.0 ms1.2 KiB
psl.eu/core/assets/vendor/once/once.min.js?v=1.0.10.0 ms1.1 KiB
psl.eu/core/misc/debounce.js?v=10.5.60.0 ms1.0 KiB
psl.eu/core/modules/system/css/components/hidden.module.css?tdefyf0.0 ms1.0 KiB
psl.eu/modules/custom/custom_front/assets/js/formation_paragraph.js?tdefyf0.0 ms919 B
psl.eu/themes/custom/oooooo/assets/images/loader.svg0.0 ms913 B
psl.eu/core/misc/drupal.init.js?v=10.5.60.0 ms891 B
psl.eu/core/misc/components/ajax-progress.module.css?tdefyf0.0 ms869 B
psl.eu/themes/custom/oooooo/assets/js/common.script.js?tdefyf0.0 ms842 B
psl.eu/core/misc/drupalSettingsLoader.js?v=10.5.60.0 ms787 B
psl.eu/themes/custom/oooooo/assets/css/oooooo.extra.css?tdefyf0.0 ms775 B
psl.eu/core/misc/components/progress.module.css?tdefyf0.0 ms741 B
psl.eu/modules/contrib/google_tag/js/gtag.ajax.js?tdefyf0.0 ms679 B
/modules/contrib/social_media_links/css/social_media_link...0.0 ms619 B
/sites/default/files/eu_cookie_compliance/eu_cookie_compl...0.0 ms594 B
psl.eu/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tdefyf0.0 ms394 B
psl.eu/themes/custom/oooooo/assets/js/plugins.script.js?tdefyf0.0 ms391 B
psl.eu/themes/custom/oooooo/assets/css/loader.style.css0.0 ms335 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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG
nodeLabel: Visuel abstrait de l'évènement
path: 1,HTML,1,BODY,4,DIV,1,MAIN,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,1,IMG
selector: div#p-44834 > div.thumbnail-hero-slider > div.thumbnail-hero-slider__media > img.image
snippet: <img src="//static.psl.eu/sites/default/files/2026-04/slider_journee_etudes_matisse_…" width="1440" height="590" alt="Visuel abstrait de l'évènement" loading="lazy" typeof="foaf:Image" data-component-id="oooooo:image" class="image max-w-full object-cover object-center img-loader">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
psl.eu/http/1.1
/sites/default/files/eu_cookie_compliance/eu_cookie_compl...http/1.1
psl.eu/themes/custom/oooooo/assets/css/loader.style.csshttp/1.1
psl.eu/core/misc/components/progress.module.css?tdefyfhttp/1.1
psl.eu/core/misc/components/ajax-progress.module.css?tdefyfhttp/1.1
psl.eu/modules/contrib/eu_cookie_compliance/css/eu_cookie_compliance.css?tdefyfhttp/1.1
psl.eu/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tdefyfhttp/1.1
/modules/contrib/social_media_links/css/social_media_link...http/1.1
psl.eu/themes/custom/oooooo/components/01-quarks/swiper/swiper.css?tdefyfhttp/1.1
psl.eu/core/modules/system/css/components/hidden.module.css?tdefyfhttp/1.1
psl.eu/themes/custom/oooooo/assets/css/oooooo.style.css?tdefyfhttp/1.1
psl.eu/themes/custom/oooooo/assets/css/oooooo.extra.css?tdefyfhttp/1.1
psl.eu/core/misc/drupalSettingsLoader.js?v=10.5.6http/1.1
psl.eu/themes/custom/oooooo/assets/images/logo.svghttp/1.1
static.psl.eu/sites/default/files/2025-04/establishments.svghttp/1.1
psl.eu/themes/custom/oooooo/assets/images/hp_formation.svghttp/1.1
static.psl.eu/sites/default/files/2025-04/students.svghttp/1.1
static.psl.eu/sites/default/files/2025-04/laboratories.svghttp/1.1
static.psl.eu/sites/default/files/2025-04/students_0.svghttp/1.1
static.psl.eu/sites/default/files/2025-04/logo-footer.svghttp/1.1
static.psl.eu/sites/default/files/2025-04/logotype-blanc.svghttp/1.1
static.psl.eu/sites/default/files/2026-04/logo_eelisa_eu_cmyk_neg.svghttp/1.1
psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1http/1.1
psl.eu/core/assets/vendor/once/once.min.js?v=1.0.1http/1.1
/sites/default/files/languages/fr_G_wxD3PjXiNucpUiMwQwyUB...http/1.1
psl.eu/core/misc/drupal.js?v=10.5.6http/1.1
psl.eu/core/misc/drupal.init.js?v=10.5.6http/1.1
psl.eu/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.0http/1.1
psl.eu/modules/custom/custom_front/assets/js/formation_paragraph.js?tdefyfhttp/1.1
psl.eu/core/assets/vendor/js-cookie/js.cookie.min.js?v=3.0.5http/1.1
/modules/contrib/eu_cookie_compliance/js/eu_cookie_compli...http/1.1
psl.eu/core/misc/progress.js?v=10.5.6http/1.1
psl.eu/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.0http/1.1
psl.eu/core/misc/debounce.js?v=10.5.6http/1.1
psl.eu/core/misc/announce.js?v=10.5.6http/1.1
psl.eu/core/misc/message.js?v=10.5.6http/1.1
psl.eu/core/misc/ajax.js?v=10.5.6http/1.1
psl.eu/modules/contrib/google_tag/js/gtag.ajax.js?tdefyfhttp/1.1
psl.eu/themes/custom/oooooo/assets/js/plugins.script.js?tdefyfhttp/1.1
psl.eu/themes/custom/oooooo/assets/js/common.script.js?tdefyfhttp/1.1
psl.eu/themes/custom/oooooo/assets/js/oooooo.script.js?tdefyfhttp/1.1
psl.eu/themes/custom/oooooo/assets/images/loader.svghttp/1.1
psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-light.woff2http/1.1
psl.eu/themes/custom/oooooo/assets/fonts/iconfont/iconfont.woff2http/1.1
psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-bold.woff2http/1.1
psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-medium.woff2http/1.1
/sites/default/files/2026-04/slider_journee_etudes_matiss...http/1.1
static.psl.eu/sites/default/files/2025-10/campus_tour_vignetteyt.jpghttp/1.1
/sites/default/files/2026-04/actu_instrument_majis_missio...http/1.1
/sites/default/files/2026-04/actu_dopamine_organisation_s...http/1.1
psl.eu/themes/custom/oooooo/assets/js/bundles/selectbox.bundle.jshttp/1.1
psl.eu/themes/custom/oooooo/assets/js/bundles/slider.bundle.jshttp/1.1
static.psl.eu/sites/default/files/2025-04/photodune-6389776-uranus-m.jpghttp/1.1
static.psl.eu/sites/default/files/2025-03/slider_labelbienvenueenfrance2025.jpghttp/1.1
static.psl.eu/sites/default/files/2025-04/slider_hp_4.pnghttp/1.1
static.psl.eu/sites/default/files/2025-03/gabarit_images_articlesactus_7.jpghttp/1.1
static.psl.eu/sites/default/files/2025-05/54380820552_543c183b44_k.jpghttp/1.1
static.psl.eu/sites/default/files/2025-05/54455527836_4097ab3587_c.jpghttp/1.1
static.psl.eu/sites/default/files/2025-04/bandeau_1920x1080.jpghttp/1.1
static.psl.eu/sites/default/files/2025-04/site.jpghttp/1.1
static.psl.eu/sites/default/files/2020-10/capture12.pnghttp/1.1
static.psl.eu/sites/default/files/2025-10/marie_curie_grevin.pnghttp/1.1
static.psl.eu/sites/default/files/2025-09/images_actu_1.pnghttp/1.1
static.psl.eu/sites/default/files/favicon.icohttp/1.1

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 25.0 KiB

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Other1.1 s
Script Evaluation642 ms
Style & Layout524 ms
Rendering208 ms
Parse HTML & CSS107 ms
Script Parsing & Compilation104 ms

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 16.5 KiB
URLTransfer SizeEst Savings
psl.eu/core/misc/ajax.js?v=10.5.616.7 KiB11.7 KiB
psl.eu/core/misc/drupal.js?v=10.5.66.1 KiB4.8 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.

Why this matters

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more

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

Estimated savings: 0.0 ms 23.9 KiB
URLTransfer SizeEst Savings
psl.eu/themes/custom/oooooo/assets/js/bundles/slider.bundle.js40.9 KiB23.9 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
Logo Eelisa european university div.footer__logos > div.footer__logo-bottom > a.footer__logo > img.image
static.psl.eu/sites/default/files/2026-04/logo_eelisa_eu_cmyk_neg.svg
logo div.header__container > div.header__left-side > a.header__logo > img.image
psl.eu/themes/custom/oooooo/assets/images/logo.svg
PSL div.footer__logos > div.footer__logo-bottom > a.footer__logo > img.image
static.psl.eu/sites/default/files/2025-04/logotype-blanc.svg
PSL div.footer__top > div.footer__logos > a.footer__logo > img.image
static.psl.eu/sites/default/files/2025-04/logo-footer.svg

More information about the performance of your application. These numbers don't directly affect the Performance score.

Max Potential First Input Delay 80 ms
Layout shift culprits
Document request latency
Optimize DOM size
Forced reflow
Improve image delivery
LCP breakdown
Optimize viewport for mobile
Minify CSS
JavaScript execution time 0.7 s
Avoid long main-thread tasks 5 long tasks found
Avoid non-composited animations 5 animated elements found
Page didn't prevent back/forward cache restoration
Network Requests
Network Round Trip Times 80 ms
Server Backend Latencies 30 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Avoid multiple page redirects
Initial server response time was short Root document took 100 ms
Avoid large layout shifts 1 layout shift found
INP breakdown
User Timing marks and measures
88

Accessibility

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.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.header__container > div.header__right-side > div.header__bottom-side > button.header__hamburger div.header__container > div.header__right-side > div.header__bottom-side > button.header__hamburger

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.hero__etablissements > ul.hero__logo > li.hero__logo-li > a#p-39536 div.hero__etablissements > ul.hero__logo > li.hero__logo-li > a#p-39536
div.social-network > ul.social-network__list > li.social-network__item > a.social-network__link div.social-network > ul.social-network__list > li.social-network__item > a.social-network__link
div.social-network > ul.social-network__list > li.social-network__item > a.social-network__link div.social-network > ul.social-network__list > li.social-network__item > a.social-network__link
div.social-network > ul.social-network__list > li.social-network__item > a.social-network__link div.social-network > ul.social-network__list > li.social-network__item > a.social-network__link
div.social-network > ul.social-network__list > li.social-network__item > a.social-network__link div.social-network > ul.social-network__list > li.social-network__item > a.social-network__link

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Actualités div#p-39542 > div.hp-news__body-container > div.hp-news__top > h2.title
20 AVRIL 2026 a.thumbnail > div.thumbnail__body > div.thumbnail__date > time
10 AVRIL 2026 a.thumbnail > div.thumbnail__body > div.thumbnail__date > time
09 AVRIL 2026 a.thumbnail > div.thumbnail__body > div.thumbnail__date > time
08 AVRIL 2026 a.thumbnail > div.thumbnail__body > div.thumbnail__date > time
08 AVRIL 2026 a.thumbnail > div.thumbnail__body > div.thumbnail__date > time
07 AVRIL 2026 a.thumbnail > div.thumbnail__body > div.thumbnail__date > time
Sciences et Société div > div > div#p-39546 > h2.hp-testimony__title
Vie étudiante div.hp-student > div.hp-student__body > div.hp-student__left > h2.hp-student__title-student

These are opportunities to improve the legibility of your content.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
FR div.header__bottom-right-side > div.dropdown-lang > div.hs-dropdown > button#hs-dropdown-example
Interactive controls are keyboard focusable
Interactive elements indicate their purpose and state
The page has a logical tab order
Visual order on the page follows DOM order
User focus is not accidentally trapped in a region
The user's focus is directed to new content added to the page
HTML5 landmark elements are used to improve navigation
Offscreen content is hidden from assistive technology
Custom controls have associated labels
Custom controls have ARIA roles
`[aria-*]` attributes match their roles
`[aria-hidden="true"]` is not present on the document `<body>`
`[role]`s have all required `[aria-*]` attributes
`[role]` values are valid
`[aria-*]` attributes have valid values
`[aria-*]` attributes are valid and not misspelled
Image elements have `[alt]` attributes
Input buttons have discernible text.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
`button`, `link`, and `menuitem` elements have accessible names
ARIA attributes are used as specified for the element's role
Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
`[aria-hidden="true"]` elements do not contain focusable descendents
Elements use only permitted ARIA attributes
Document has a `<title>` element
`<html>` element has a `[lang]` attribute
`<html>` element has a valid value for its `[lang]` attribute
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
No element has a `[tabindex]` value greater than 0
Touch targets have sufficient size and spacing.
Heading elements appear in a sequentially-descending order
Document has a main landmark.
Deprecated ARIA roles were not used
ARIA IDs are unique
`[accesskey]` values are unique
ARIA input fields have accessible names
ARIA `meter` elements have accessible names
ARIA `progressbar` elements have accessible names
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[role]`s are contained by their required parent element
Elements with the `role=text` attribute do not have focusable descendents.
ARIA toggle fields have accessible names
ARIA `tooltip` elements have accessible names
ARIA `treeitem` elements have accessible names
The page contains a heading, skip link, or landmark region
`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Definition list items are wrapped in `<dl>` elements
No form fields have multiple labels
`<frame>` or `<iframe>` elements have a title
`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
`<input type="image">` elements have `[alt]` text
Form elements have associated labels
Links are distinguishable without relying on color.
The document does not use `<meta http-equiv="refresh">`
`<object>` elements have alternate text
Select elements have associated label elements.
Skip links are focusable.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
`[lang]` attributes have a valid value
`<video>` elements contain a `<track>` element with `[kind="captions"]`
Tables have different content in the summary attribute and `<caption>`.
All heading elements contain content.
Uses ARIA roles only on compatible elements
Image elements do not have `[alt]` attributes that are redundant text.
Identical links have the same purpose.
Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
`<td>` elements in a large `<table>` have one or more table headers.
100

Best Practices

Uses HTTPS
Avoids deprecated APIs
Avoids third-party cookies
Allows users to paste into input fields
Avoids requesting the geolocation permission on page load
Avoids requesting the notification permission on page load
Displays images with correct aspect ratio
Serves images with appropriate resolution
Page has the HTML doctype
Properly defines charset
No browser errors logged to the console
No issues in the `Issues` panel in Chrome Devtools
Ensure CSP is effective against XSS attacks
Use a strong HSTS policy
Ensure proper origin isolation with COOP
Mitigate clickjacking with XFO or CSP
Mitigate DOM-based XSS with Trusted Types
Detected JavaScript libraries
Page has valid source maps
Redirects HTTP traffic to HTTPS
92

SEO

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.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Format your HTML in a way that enables crawlers to better understand your app’s content.

Structured data is valid
Page isn’t blocked from indexing
Document has a `<title>` element
Page has successful HTTP status code
Links have descriptive text
Links are crawlable
Image elements have `[alt]` attributes
Document has a valid `hreflang`
Document has a valid `rel=canonical`
robots.txt is valid

Desktop audit not available for this result.

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