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https://persee.fr

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
3
REVIEW
3
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
67
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
64
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
7 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 47 requests
FIX
3.4 MB transferred, 47 requests
Warning::
Page weighs 3.7 MB (3.4 MB transferred)
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Info::
CSS is 817 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 817 KB
Info::
47 HTTP requests
Info::
Estimated 0.72 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
47 requests
0.72 g CO2 per page load
JavaScript 1.7 MiB 49%
CSS 817.4 KiB 23%
Images 797.1 KiB 23%
Fonts 130.9 KiB 4%
HTML 42.5 KiB 1%
Other 2.0 KiB 0%
Other 548 B 0%
Other 464 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

F
JS Bundles
Action
10 scripts, 707 KB unused
FIX
10 scripts, 707 KB unused
Warning::
https://www.persee.fr/html/js/barebone.jsp?browser...: 591 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.persee.fr/html/js/barebone.jsp?browser...: unminified — 894 KB could be saved
Warning::
https://www.googletagmanager.com/gtag/js?id=G-4RE4...: 64 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.persee.fr/html/portlet/journal/js/main...: 52 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.persee.fr/html/portlet/journal/js/main...: unminified — 12 KB could be saved
Info::
Total unused JavaScript: 707 KB
707 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.persee.fr/html/js/barebone.jsp?browserId=other&themeId=persee_WAR_perseetheme&colorSchemeId=persee&minifierType=js&minifierBundleId=javascript.barebone.files&languageId=fr_FR&b=6205&t=14526126140001411 KB591 KB (42%)✗1st
https://www.googletagmanager.com/gtag/js?id=G-4RE4X6PZER&cx=c&_slc=1148 KB64 KB (43%)✓3rd
https://www.persee.fr/html/portlet/journal/js/main.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=177675184336753 KB52 KB (100%)✗1st
https://www.persee.fr/html/portlet/journal/js/navigation.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=177675184336714 KB—✗1st
https://www.persee.fr/persee-theme/js/main.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=17767518365661 KB—✓1st
https://www.google-analytics.com/analytics.js21 KB—✓3rd
https://www.persee.fr/combo/?browserId=other&minifierType=&languageId=fr_FR&b=6205&t=1452612614000&/html/js/aui/base-core/base-core-min.js&/html/js/aui/base-observable/base-observable-min.js&/html/js/aui/base-build/base-build-min.js&/html/js/aui/node-scroll-info/node-scroll-info-min.js&/html/js/aui/color-base/color-base-min.js&/html/js/aui/transition/transition-min.js22 KB—✓1st
https://www.persee.fr/combo/?browserId=other&minifierType=&languageId=fr_FR&b=6205&t=1452612614000&/html/js/aui/event-touch/event-touch-min.js&/html/js/aui/event-move/event-move-min.js6 KB—✓1st
https://www.persee.fr/html/js/liferay/available_languages.jsp?browserId=other&themeId=persee_WAR_perseetheme&colorSchemeId=persee&minifierType=js&languageId=fr_FR&b=6205&t=14526126140001 KB—✓1st
https://www.persee.fr/combo/?browserId=other&minifierType=&languageId=fr_FR&b=6205&t=1452612614000&/html/js/liferay/language.js&/html/js/aui/querystring-stringify/querystring-stringify-min.js&/html/js/aui/aui-widget-cssclass/aui-widget-cssclass-min.js&/html/js/aui/aui-widget-toggle/aui-widget-toggle-min.js&/html/js/aui/cookie/cookie-min.js&/html/js/liferay/session.js&/html/js/aui/aui-io-request/aui-io-request-min.js&/html/js/liferay/ajax_session.js24 KB—✗1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
Page Weight Inventory
Action
47 resources · 3.4 MB · 707 KB savings available
FIX
47 resources · 3.4 MB · 707 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~707 KB of savings available
Info::
4 third-party resources (5% of weight)
Info::
4 resources over 200KB
47 resources · 3.4 MiB · 4 third-party 2.4 MiB over 1MB target
JavaScript 49% · 1.7 MiB
CSS 23% · 817.4 KiB
Image 23% · 798.7 KiB
Font 4% · 130.9 KiB
Document 1% · 42.8 KiB
Other 0% · 1012 B

~706.9 KiB of savings available

Remove unused JavaScript: 706.9 KiB
C
Image Optimization
Action
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
https://www.persee.fr/static/persee.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.persee.fr/persee-theme/images/picto/mo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.persee.fr/documents/10099/1367650/cls.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.persee.fr/documents/10099/1367650/ehes... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.persee.fr/documents/10099/1367650/cbc.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20 images 797 KB
0 oversized -0 KB
20 legacy format
5 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-transform
REVIEW
no-transform
Info::
Cache-Control header is set
Got: no-transform
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-transform

DirectiveValueMeaning
no-transform—
A+
Third-Party Impact
5% third-party, 0 ms blocking
PASS
5% third-party, 0 ms blocking
Info::
Third-party code accounts for 5% of page weight (170.3 KiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-party
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
JS Execution Cost
237ms total JS execution
PASS
237ms total JS execution
Info::
https://www.persee.fr/html/js/barebone.jsp?browser...: 91ms CPU time
Info::
https://www.persee.fr/: 75ms CPU time
Info::
Unattributable: 70ms CPU time
Info::
Third-party scripts: 70ms (30% of total)

Main Thread Breakdown

Script Evaluation 38% Other 24% Style & Layout 16% Script Parsing & Compilation 14% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.persee.fr/html/js/barebone.jsp?browserId=other&themeId=persee_WAR_perseetheme&colorSchemeId=persee&minifierType=js&minifierBundleId=javascript.barebone.files&languageId=fr_FR&b=6205&t=145261261400091ms53ms30ms1st
https://www.persee.fr/75ms5ms1ms1st
Unattributable70ms13ms0ms3rd
A+
Font Loading
3 fonts (131 KB)
PASS
3 fonts (131 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

131 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 2.4 s LCP 3.5 shttps://www.persee.fr/persee-theme/css/fonts/ens/BebasNeueBold-webfont.woff2BebasNeueBold-webfont.w... https://www.persee.fr/persee-theme/css/fonts/ens/BebasNeueBold-webfont.woff2 — 15.5 KiB — 31 ms — font-display: swaphttps://www.persee.fr/persee-search-portlet/webjars/font-awesome/7.0.0/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.persee.fr/persee-search-portlet/webjars/font-awesome/7.0.0/webfonts/fa-brands-400.woff2 — 99.3 KiB — 61 ms — font-display: swaphttps://www.persee.fr/persee-theme/css/fonts/ens/BebasNeueRegular-webfont.woff2BebasNeueRegular-webfon... https://www.persee.fr/persee-theme/css/fonts/ens/BebasNeueRegular-webfont.woff2 — 16.1 KiB — 38 ms — font-display: swap
BebasNeueBold-webfont.w... woff2 swap
Size 15 KB
Load time 31 ms
Start 705 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 99 KB
Load time 61 ms
Start 708 ms
Risk FOUT — text flashes from fallback to web font
BebasNeueRegular-webfon... woff2 swap
Size 16 KB
Load time 38 ms
Start 708 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
47 requests over 1163ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.4 s LCP 3.5 shttps://www.persee.fr// https://www.persee.fr/ — 200 — 42.5 KiB — 425 ms — http/1.1https://www.persee.fr/persee-theme/css/aui.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751836566/persee-theme/css/aui.css?browserId... https://www.persee.fr/persee-theme/css/aui.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751836566 — 200 — 209.6 KiB — 115 ms — http/1.1https://www.persee.fr/html/css/main.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1452609384000/html/css/main.css?browserId=other&... https://www.persee.fr/html/css/main.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1452609384000 — 200 — 143.5 KiB — 87 ms — http/1.1https://www.persee.fr/html/portlet/asset_publisher/css/main.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751843367/html/portlet/asset_publisher/css/m... https://www.persee.fr/html/portlet/asset_publisher/css/main.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751843367 — 200 — 6.6 KiB — 74 ms — http/1.1https://www.persee.fr/persee-search-portlet/webjars/font-awesome/7.0.0/css/fontawesome.min.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751838712/persee-search-portlet/webjars/font... https://www.persee.fr/persee-search-portlet/webjars/font-awesome/7.0.0/css/fontawesome.min.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751838712 — 200 — 56.4 KiB — 115 ms — http/1.1https://www.persee.fr/persee-search-portlet/webjars/font-awesome/7.0.0/css/solid.min.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751838712/persee-search-portlet/webjars/font... https://www.persee.fr/persee-search-portlet/webjars/font-awesome/7.0.0/css/solid.min.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751838712 — 200 — 1.2 KiB — 73 ms — http/1.1https://www.persee.fr/persee-search-portlet/webjars/font-awesome/7.0.0/css/brands.min.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751838712/persee-search-portlet/webjars/font... https://www.persee.fr/persee-search-portlet/webjars/font-awesome/7.0.0/css/brands.min.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751838712 — 200 — 15.3 KiB — 93 ms — http/1.1https://www.persee.fr/html/portlet/journal/css/main.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751843367/html/portlet/journal/css/main.css?... https://www.persee.fr/html/portlet/journal/css/main.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751843367 — 200 — 21.6 KiB — 121 ms — http/1.1https://www.persee.fr/html/js/barebone.jsp?browserId=other&themeId=persee_WAR_perseetheme&colorSchemeId=persee&minifierType=js&minifierBundleId=javascript.barebone.files&languageId=fr_FR&b=6205&t=1452612614000/html/js/barebone.jsp?browserId=oth... https://www.persee.fr/html/js/barebone.jsp?browserId=other&themeId=persee_WAR_perseetheme&colorSchemeId=persee&minifierType=js&minifierBundleId=javascript.barebone.files&languageId=fr_FR&b=6205&t=1452612614000 — 200 — 1.4 MiB — 196 ms — http/1.1https://www.persee.fr/html/portlet/journal/js/main.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=1776751843367/html/portlet/journal/js/main.js?br... https://www.persee.fr/html/portlet/journal/js/main.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=1776751843367 — 200 — 52.9 KiB — 128 ms — http/1.1https://www.persee.fr/html/portlet/journal/js/navigation.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=1776751843367/html/portlet/journal/js/navigation... https://www.persee.fr/html/portlet/journal/js/navigation.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=1776751843367 — 200 — 14.4 KiB — 124 ms — http/1.1https://www.persee.fr/persee-theme/css/main.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751836566/persee-theme/css/main.css?browserI... https://www.persee.fr/persee-theme/css/main.css?browserId=other&themeId=persee_WAR_perseetheme&minifierType=css&languageId=fr_FR&b=6205&t=1776751836566 — 200 — 362.2 KiB — 174 ms — http/1.1https://www.persee.fr/static/persee.png/static/persee.png https://www.persee.fr/static/persee.png — 200 — 10.0 KiB — 29 ms — http/1.1https://www.persee.fr/persee-theme/images/skin/persee/picto/search-1.png/persee-theme/images/skin/persee/pi... https://www.persee.fr/persee-theme/images/skin/persee/picto/search-1.png — 200 — 1.3 KiB — 25 ms — http/1.1https://www.persee.fr/static/LOGO_CNRS_BLEU.png/static/LOGO_CNRS_BLEU.png https://www.persee.fr/static/LOGO_CNRS_BLEU.png — 200 — 19.2 KiB — 31 ms — http/1.1https://www.persee.fr/documents/10099/505733/ENS_2024-11/1a6cc584-1c59-4629-9cf0-b20463058ffd?t=1730799273852/documents/10099/505733/ENS_2024-11... https://www.persee.fr/documents/10099/505733/ENS_2024-11/1a6cc584-1c59-4629-9cf0-b20463058ffd?t=1730799273852 — 200 — 4.9 KiB — 36 ms — http/1.1https://www.persee.fr/documents/10099/505733/MENESR_logo_portail.png/e9ae2f42-35e1-440c-a746-7d67071b79fe?t=1752237933703/documents/10099/505733/MENESR_logo... https://www.persee.fr/documents/10099/505733/MENESR_logo_portail.png/e9ae2f42-35e1-440c-a746-7d67071b79fe?t=1752237933703 — 200 — 19.2 KiB — 55 ms — http/1.1https://www.persee.fr/persee-theme/js/main.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=1776751836566/persee-theme/js/main.js?browserId=... https://www.persee.fr/persee-theme/js/main.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=1776751836566 — 200 — 1.1 KiB — 25 ms — http/1.1https://www.persee.fr/documents/10099/1595712/Bandeau_Keepers.png/d825d1ea-7141-453e-81ef-1812fc44270f?t=1748426676067/documents/10099/1595712/Bandeau_Ke... https://www.persee.fr/documents/10099/1595712/Bandeau_Keepers.png/d825d1ea-7141-453e-81ef-1812fc44270f?t=1748426676067 — 200 — 49.9 KiB — 31 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
30% of JavaScript execution is third-party
First-party Third-party 70ms · 0KB · €1/mo
Unattributable
Other
Optional
Execution 70ms
Transfer 0 KB
Monthly Cost €1/mo

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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