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https://persee.fr

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
54
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.

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

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
17
8 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 48 requests
FIX
3.4 MB transferred, 48 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::
48 HTTP requests
Info::
Estimated 0.72 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
48 requests
0.72 g CO2 per page load
JavaScript 1.7 MiB 49%
CSS 817.4 KiB 23%
Images 797.2 KiB 23%
Fonts 130.9 KiB 4%
HTML 40.4 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
11 scripts, 696 KB unused
FIX
11 scripts, 696 KB unused
Warning::
https://www.persee.fr/html/js/barebone.jsp?browser...: 580 KB unused (41%)
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: 696 KB
696 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 KB580 KB (41%)✗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=177675253824553 KB52 KB (100%)✗1st
https://www.persee.fr/html/portlet/journal/js/navigation.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=177675253824514 KB—✗1st
https://www.persee.fr/persee-theme/js/main.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=17767525318171 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
48 resources · 3.4 MB · 696 KB savings available
FIX
48 resources · 3.4 MB · 696 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~696 KB of savings available
Info::
4 third-party resources (5% of weight)
Info::
4 resources over 200KB
48 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% · 798.8 KiB
Font 4% · 130.9 KiB
Document 1% · 40.7 KiB
Other 0% · 1012 B

~695.7 KiB of savings available

Remove unused JavaScript: 695.7 KiB
C
Image Optimization
Action
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
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/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/cbc.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.persee.fr/static/persee.png 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
JS Execution Cost
Action
1081ms total JS execution
REVIEW
1081ms total JS execution
Warning::
Unattributable: 348ms CPU time
Warning::
https://www.persee.fr/html/js/barebone.jsp?browser...: 346ms CPU time
Info::
https://www.persee.fr/: 232ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-4RE4...: 155ms CPU time
Info::
Third-party scripts: 503ms (47% of total)

Main Thread Breakdown

Script Evaluation 37% Other 27% Script Parsing & Compilation 14% Style & Layout 13% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
Unattributable348ms53ms0ms3rd
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=1452612614000346ms201ms114ms1st
https://www.persee.fr/232ms17ms5ms1st
https://www.googletagmanager.com/gtag/js?id=G-4RE4X6PZER&cx=c&_slc=1155ms122ms32ms3rd
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+
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 13.9 s LCP 16.7 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 — 27 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 — 52 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 — 52 ms — font-display: swap
BebasNeueBold-webfont.w... woff2 swap
Size 15 KB
Load time 27 ms
Start 752 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 99 KB
Load time 52 ms
Start 752 ms
Risk FOUT — text flashes from fallback to web font
BebasNeueRegular-webfon... woff2 swap
Size 16 KB
Load time 52 ms
Start 753 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
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
48 requests over 1219ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 13.9 s LCP 16.7 shttps://www.persee.fr// https://www.persee.fr/ — 200 — 40.4 KiB — 486 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=1776752531817/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=1776752531817 — 200 — 209.6 KiB — 114 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 — 80 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=1776752538245/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=1776752538245 — 200 — 6.6 KiB — 75 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=1776752532833/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=1776752532833 — 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=1776752532833/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=1776752532833 — 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=1776752532833/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=1776752532833 — 200 — 15.3 KiB — 92 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=1776752538245/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=1776752538245 — 200 — 21.6 KiB — 120 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 — 199 ms — http/1.1https://www.persee.fr/html/portlet/journal/js/main.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=1776752538245/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=1776752538245 — 200 — 52.9 KiB — 133 ms — http/1.1https://www.persee.fr/html/portlet/journal/js/navigation.js?browserId=other&minifierType=js&languageId=fr_FR&b=6205&t=1776752538245/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=1776752538245 — 200 — 14.4 KiB — 128 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=1776752531817/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=1776752531817 — 200 — 362.2 KiB — 181 ms — http/1.1https://www.persee.fr/static/persee.png/static/persee.png https://www.persee.fr/static/persee.png — 200 — 10.0 KiB — 28 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 — 24 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 — 29 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 — 35 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
47% of JavaScript execution is third-party
First-party Third-party 503ms · 148KB · €5/mo
Unattributable
Other
Costly
Execution 348ms
Transfer 0 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Optional
Execution 155ms
Transfer 148 KB
Unused 43%
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Unattributable adds 348ms and costs ~€4/month

47% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 348ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

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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