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https://cnrs.fr

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.
92
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.

3.11 s

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

5.74 s

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

2.21 s

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.

5.76 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.

14.96 s

Page Load Progression

673 ms
1.3 s
2.0 s
2.7 s
3.4 s
4.0 s
4.7 s
5.4 s
Checks
17
8 PASS 3 REVIEW 4 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6081ms total JS execution
FIX
6081ms total JS execution
Warning::
https://www.cnrs.fr/TSPD/087dc22938ab2000cc40d18b6...: 3765ms CPU time
Warning::
https://www.cnrs.fr/libraries/MathJax/es5/tex-mml-...: 581ms CPU time
Warning::
Unattributable: 564ms CPU time
Warning::
https://www.cnrs.fr/fr: 562ms CPU time
Warning::
https://static.axept.io/sdk.js: 473ms CPU time
Warning::
Third-party scripts: 6081ms (100% of total)

Main Thread Breakdown

Script Evaluation 75% Other 10% Style & Layout 6% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.cnrs.fr/TSPD/087dc22938ab2000cc40d18b6180f1c9470cce7869b54a973706b8455c5ba78e31e69f1b12116914?type=83765ms3648ms33ms3rd
https://www.cnrs.fr/libraries/MathJax/es5/tex-mml-chtml.js581ms414ms152ms3rd
Unattributable564ms18ms0ms3rd
https://www.cnrs.fr/fr562ms16ms2ms3rd
https://static.axept.io/sdk.js473ms386ms82ms3rd
https://www.cnrs.fr/sites/default/files/js/js_b2tTzgwUeUO630pbzoKxLY_CqfcJPZrB-ApaBbZfMgw.js?scope=footer&delta=0&language=fr&theme=cnrs&include=eJx1j1ESgzAIRC-UCUdyMEGljSETSM3xa7Wt_ekP85ZZYMFOxVhgRCU3khnVgXoRpThMnHapgM1k0DaubP8sM2WqmFzIh18XPPFY-6IhyLpKhh_2k4hlMdLTUecS4Usez2QuSJI6SocPXJ1IE7ZkjrolzneItRVM_i0dl9f5M8OKttywg0qrgVxZxEQ3LgQXes77hw-mTeGoHveRJ0tVcno136ms112ms19ms3rd
D
Page Weight Inventory
Action
56 resources · 1.9 MB · 268 KB savings available
FIX
56 resources · 1.9 MB · 268 KB savings available
Warning::
Page weight 960 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~268 KB of savings available
Warning::
55 third-party resources (100% of weight)
Info::
4 resources over 200KB
56 resources · 1.9 MiB · 55 third-party 959.9 KiB over 1MB target
Image 50% · 985.8 KiB
JavaScript 36% · 715.8 KiB
Font 6% · 128.2 KiB
Document 5% · 90.1 KiB
CSS 2% · 49.4 KiB
Other 1% · 14.6 KiB

~268.1 KiB of savings available

Remove unused JavaScript: 268.1 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Page Weight Budget
Action
1.9 MB transferred, 56 requests
REVIEW
1.9 MB transferred, 56 requests
Info::
Page weighs 4.1 MB (1.9 MB transferred)
Warning::
JavaScript is 716 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 716 KB
Info::
56 HTTP requests
Info::
Estimated 0.41 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
56 requests
0.41 g CO2 per page load
Images 970.7 KiB 49%
JavaScript 715.8 KiB 36%
Fonts 128.2 KiB 6%
HTML 87.8 KiB 4%
CSS 49.4 KiB 2%
Other 16.9 KiB 1%
Other 14.2 KiB 1%
Other 596 B 0%
Other 432 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

B
Image Optimization
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://www.cnrs.fr/themes/custom/cnrs/logo-footer... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 971 KB
0 oversized -0 KB
9 legacy format
1 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

C
JS Bundles
Action
14 scripts, 268 KB unused
REVIEW
14 scripts, 268 KB unused
Warning::
https://www.cnrs.fr/libraries/MathJax/es5/tex-mml-...: 127 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.axept.io/sdk.js: 84 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.cnrs.fr/sites/default/files/js/js_njb1...: 30 KB unused (92%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.statistiques.cnrs.fr/js/container_OYTi...: 27 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 268 KB
268 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.cnrs.fr/libraries/MathJax/es5/tex-mml-chtml.js261 KB127 KB (49%)✓3rd
https://static.axept.io/sdk.js183 KB84 KB (46%)✓3rd
https://www.cnrs.fr/sites/default/files/js/js_njb19_Z1fFefGsgFBHozijSv-XrOR65P6pMWhfKaoK4.js?scope=footer&delta=6&language=fr&theme=cnrs&include=eJx1j1ESgzAIRC-UCUdyMEGljSETSM3xa7Wt_ekP85ZZYMFOxVhgRCU3khnVgXoRpThMnHapgM1k0DaubP8sM2WqmFzIh18XPPFY-6IhyLpKhh_2k4hlMdLTUecS4Usez2QuSJI6SocPXJ1IE7ZkjrolzneItRVM_i0dl9f5M8OKttywg0qrgVxZxEQ3LgQXes77hw-mTeGoHveRJ0tVcno33 KB30 KB (92%)✓3rd
https://www.statistiques.cnrs.fr/js/container_OYTiSMwj.js35 KB27 KB (77%)✓3rd
https://player.ausha.co/ausha-player.js1 KB—✓3rd
https://www.cnrs.fr/sites/default/files/js/js_aAJjDYyF0qLfKGR7EGkrAZZEr83nHqligfw5kyojdBc.js?scope=footer&delta=3&language=fr&theme=cnrs&include=eJx1j1ESgzAIRC-UCUdyMEGljSETSM3xa7Wt_ekP85ZZYMFOxVhgRCU3khnVgXoRpThMnHapgM1k0DaubP8sM2WqmFzIh18XPPFY-6IhyLpKhh_2k4hlMdLTUecS4Usez2QuSJI6SocPXJ1IE7ZkjrolzneItRVM_i0dl9f5M8OKttywg0qrgVxZxEQ3LgQXes77hw-mTeGoHveRJ0tVcno10 KB—✓3rd
https://statistiques.cnrs.fr/matomo.js22 KB—✓3rd
https://www.cnrs.fr/sites/default/files/js/js_P6EHghF-bDtriCWcl1MXoxzr6w6zYMwy7E8k7ADx_ts.js?scope=footer&delta=4&language=fr&theme=cnrs&include=eJx1j1ESgzAIRC-UCUdyMEGljSETSM3xa7Wt_ekP85ZZYMFOxVhgRCU3khnVgXoRpThMnHapgM1k0DaubP8sM2WqmFzIh18XPPFY-6IhyLpKhh_2k4hlMdLTUecS4Usez2QuSJI6SocPXJ1IE7ZkjrolzneItRVM_i0dl9f5M8OKttywg0qrgVxZxEQ3LgQXes77hw-mTeGoHveRJ0tVcno5 KB—✓3rd
https://www.cnrs.fr/TSPD/?type=183 KB—✓3rd
https://www.cnrs.fr/sites/default/files/js/js_x8dbReRo8xrhUrBwJZL5d8PWOL6TOA_R7WI2H0aoU8g.js?scope=footer&delta=1&language=fr&theme=cnrs&include=eJx1j1ESgzAIRC-UCUdyMEGljSETSM3xa7Wt_ekP85ZZYMFOxVhgRCU3khnVgXoRpThMnHapgM1k0DaubP8sM2WqmFzIh18XPPFY-6IhyLpKhh_2k4hlMdLTUecS4Usez2QuSJI6SocPXJ1IE7ZkjrolzneItRVM_i0dl9f5M8OKttywg0qrgVxZxEQ3LgQXes77hw-mTeGoHveRJ0tVcno1 KB—✓3rd

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

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

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
8 fonts (128 KB)
PASS
8 fonts (128 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

128 KB total

Render-blocking

0

of 8

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 4.0 s 5.0 s 6.0 s FCP 3.1 s LCP 5.7 shttps://www.cnrs.fr/themes/custom/cnrs/google-fonts/franklin/fonts/libre-franklin-v7-latin-regular.woff2libre-franklin-v7-latin... https://www.cnrs.fr/themes/custom/cnrs/google-fonts/franklin/fonts/libre-franklin-v7-latin-regular.woff2 — 14.2 KiB — 386 ms — font-display: swaphttps://www.cnrs.fr/themes/custom/cnrs/fonts/fontello.woff?53a56c1e=fontello.woff https://www.cnrs.fr/themes/custom/cnrs/fonts/fontello.woff?53a56c1e= — 14.2 KiB — 385 ms — font-display: swaphttps://www.cnrs.fr/themes/custom/cnrs/google-fonts/chivo/fonts/chivo-v12-latin-regular.woff2chivo-v12-latin-regular... https://www.cnrs.fr/themes/custom/cnrs/google-fonts/chivo/fonts/chivo-v12-latin-regular.woff2 — 18.5 KiB — 554 ms — font-display: swaphttps://www.cnrs.fr/themes/custom/cnrs/google-fonts/franklin/fonts/libre-franklin-v7-latin-700.woff2libre-franklin-v7-latin... https://www.cnrs.fr/themes/custom/cnrs/google-fonts/franklin/fonts/libre-franklin-v7-latin-700.woff2 — 14.3 KiB — 392 ms — font-display: swaphttps://www.cnrs.fr/themes/custom/cnrs/google-fonts/chivo/fonts/chivo-v12-latin-700.woff2chivo-v12-latin-700.woff2 https://www.cnrs.fr/themes/custom/cnrs/google-fonts/chivo/fonts/chivo-v12-latin-700.woff2 — 16.5 KiB — 551 ms — font-display: swaphttps://www.cnrs.fr/themes/custom/cnrs/google-fonts/chivo/fonts/chivo-v12-latin-900.woff2chivo-v12-latin-900.woff2 https://www.cnrs.fr/themes/custom/cnrs/google-fonts/chivo/fonts/chivo-v12-latin-900.woff2 — 17.5 KiB — 550 ms — font-display: swaphttps://www.cnrs.fr/themes/custom/cnrs/google-fonts/rubik/fonts/rubik-v12-latin-regular.woff2rubik-v12-latin-regular... https://www.cnrs.fr/themes/custom/cnrs/google-fonts/rubik/fonts/rubik-v12-latin-regular.woff2 — 18.7 KiB — 211 ms — font-display: swaphttps://www.cnrs.fr/themes/custom/cnrs/google-fonts/franklin/fonts/libre-franklin-v7-latin-500.woff2libre-franklin-v7-latin... https://www.cnrs.fr/themes/custom/cnrs/google-fonts/franklin/fonts/libre-franklin-v7-latin-500.woff2 — 14.2 KiB — 211 ms — font-display: swap
libre-franklin-v7-latin... woff2 swap
Size 14 KB
Load time 386 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
fontello.woff woff swap
Size 14 KB
Load time 385 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
chivo-v12-latin-regular... woff2 swap
Size 19 KB
Load time 554 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
libre-franklin-v7-latin... woff2 swap
Size 14 KB
Load time 392 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
chivo-v12-latin-700.woff2 woff2 swap
Size 16 KB
Load time 551 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
chivo-v12-latin-900.woff2 woff2 swap
Size 18 KB
Load time 550 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
rubik-v12-latin-regular... woff2 swap
Size 19 KB
Load time 211 ms
Start 5.2 s
Risk FOUT — text flashes from fallback to web font
libre-franklin-v7-latin... woff2 swap
Size 14 KB
Load time 211 ms
Start 5.2 s
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)

Fixing the unchecked items could save ~4 KB and ~8 ms

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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: cegedim.cloud

Network Waterfall
56 requests over 6224ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.1 s LCP 5.7 shttps://cnrs.fr// https://cnrs.fr/ — 302 — 406 B — 832 ms — h2https://www.cnrs.fr/www.cnrs.fr/ https://www.cnrs.fr/ — 301 — 1.4 KiB — 216 ms — h2https://www.cnrs.fr/frwww.cnrs.fr/fr https://www.cnrs.fr/fr — 200 — 81.5 KiB — 823 ms — h2https://www.cnrs.fr/TSPD/?type=18www.cnrs.fr/TSPD/?type=18 https://www.cnrs.fr/TSPD/?type=18 — 200 — 2.9 KiB — 602 ms — h2https://www.cnrs.fr/sites/default/files/css/css_Q4OVqXPi3xfG5mG06xoE72PhfSOI1P3Gcu-KCUlRikc.css?delta=0&language=fr&theme=cnrs&include=eJxFj1EOgzAMQy9U0SOhQA10C02VtIPt9OvGGD_Rs-NIzoBSoD32LIbQT5GbND8jQYndyGT29AMZTl5hRjPs1ElC26V2dKQ-ZAspghuFRQfZfcBElUszFD5ozcQd3Wg_jCS6EscXHPbCMd3PyE-6SaQkKTD_J5dJaVbKi53py-lqynXgaEsrkRcpYlvM8Bd2LGN7z55WsB7FHxGb-e_sVgmV8QbBi29Hwww.cnrs.fr/sites/default/files/css... https://www.cnrs.fr/sites/default/files/css/css_Q4OVqXPi3xfG5mG06xoE72PhfSOI1P3Gcu-KCUlRikc.css?delta=0&language=fr&theme=cnrs&include=eJxFj1EOgzAMQy9U0SOhQA10C02VtIPt9OvGGD_Rs-NIzoBSoD32LIbQT5GbND8jQYndyGT29AMZTl5hRjPs1ElC26V2dKQ-ZAspghuFRQfZfcBElUszFD5ozcQd3Wg_jCS6EscXHPbCMd3PyE-6SaQkKTD_J5dJaVbKi53py-lqynXgaEsrkRcpYlvM8Bd2LGN7z55WsB7FHxGb-e_sVgmV8QbBi29H — 200 — 1.5 KiB — 607 ms — h2https://www.cnrs.fr/sites/default/files/css/css_tmWL4l4gyK-hJkxomNYfR_usgi9D7gMAaW3vp8TgW90.css?delta=1&language=fr&theme=cnrs&include=eJxFj1EOgzAMQy9U0SOhQA10C02VtIPt9OvGGD_Rs-NIzoBSoD32LIbQT5GbND8jQYndyGT29AMZTl5hRjPs1ElC26V2dKQ-ZAspghuFRQfZfcBElUszFD5ozcQd3Wg_jCS6EscXHPbCMd3PyE-6SaQkKTD_J5dJaVbKi53py-lqynXgaEsrkRcpYlvM8Bd2LGN7z55WsB7FHxGb-e_sVgmV8QbBi29Hwww.cnrs.fr/sites/default/files/css... https://www.cnrs.fr/sites/default/files/css/css_tmWL4l4gyK-hJkxomNYfR_usgi9D7gMAaW3vp8TgW90.css?delta=1&language=fr&theme=cnrs&include=eJxFj1EOgzAMQy9U0SOhQA10C02VtIPt9OvGGD_Rs-NIzoBSoD32LIbQT5GbND8jQYndyGT29AMZTl5hRjPs1ElC26V2dKQ-ZAspghuFRQfZfcBElUszFD5ozcQd3Wg_jCS6EscXHPbCMd3PyE-6SaQkKTD_J5dJaVbKi53py-lqynXgaEsrkRcpYlvM8Bd2LGN7z55WsB7FHxGb-e_sVgmV8QbBi29H — 200 — 3.3 KiB — 612 ms — h2https://www.cnrs.fr/sites/default/files/css/css_HqMrH59vUPM3oHJY3bRGzLg2euR-LvxgvCdnCXNsXAE.css?delta=2&language=fr&theme=cnrs&include=eJxFj1EOgzAMQy9U0SOhQA10C02VtIPt9OvGGD_Rs-NIzoBSoD32LIbQT5GbND8jQYndyGT29AMZTl5hRjPs1ElC26V2dKQ-ZAspghuFRQfZfcBElUszFD5ozcQd3Wg_jCS6EscXHPbCMd3PyE-6SaQkKTD_J5dJaVbKi53py-lqynXgaEsrkRcpYlvM8Bd2LGN7z55WsB7FHxGb-e_sVgmV8QbBi29Hwww.cnrs.fr/sites/default/files/css... 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https://www.cnrs.fr/TSPD/087dc22938ab28004072b8af798612c83aa14177149fcef2c8ea01cfb72226f98ad86bcabb94cd80a7e1570cab5bcdb7?type=13 — 200 — 596 B — 214 ms — h2https://fonts.axept.io/fonts.googleapis.com/css?family=Source%20Sans%203:regular,500,600,700fonts.axept.io/fonts.googleapis.com... https://fonts.axept.io/fonts.googleapis.com/css?family=Source%20Sans%203:regular,500,600,700 — 200 — 1.4 KiB — 111 ms — h2https://client.axept.io/pack/frclient.axept.io/pack/fr https://client.axept.io/pack/fr — 200 — 4.7 KiB — 114 ms — h3https://api.axept.io/v1/analytics/evtsapi.axept.io/v1/analytics/evts https://api.axept.io/v1/analytics/evts — 204 — 350 B — 208 ms — h2https://www.cnrs.fr/themes/custom/cnrs/google-fonts/rubik/fonts/rubik-v12-latin-regular.woff2www.cnrs.fr/themes/custom/cnrs/goog... https://www.cnrs.fr/themes/custom/cnrs/google-fonts/rubik/fonts/rubik-v12-latin-regular.woff2 — 200 — 18.7 KiB — 211 ms — 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h2https://statistiques.cnrs.fr/matomo.php?action_name=Centre%20national%20de%20la%20recherche%20scientifique%20(CNRS)&idsite=1&rec=1&r=920236&h=20&m=20&s=12&url=https%3A%2F%2Fwww.cnrs.fr%2Ffr&_id=b9cad6a0ff1bf536&_idn=0&send_image=0&_refts=0&pv_id=dJUaru&pf_net=0&pf_srv=207&pf_tfr=616&pf_dm1=2226&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224.0.0.0%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146.0.7680.164%22%7D%5D%2C%22mobile%22%3Atrue%2C%22model%22%3A%22moto%20g%20power%20(2022)%22%2C%22platform%22%3A%22Android%22%2C%22platformVersion%22%3A%2211.0%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=412x823statistiques.cnrs.fr/matomo.php?act... https://statistiques.cnrs.fr/matomo.php?action_name=Centre%20national%20de%20la%20recherche%20scientifique%20(CNRS)&idsite=1&rec=1&r=920236&h=20&m=20&s=12&url=https%3A%2F%2Fwww.cnrs.fr%2Ffr&_id=b9cad6a0ff1bf536&_idn=0&send_image=0&_refts=0&pv_id=dJUaru&pf_net=0&pf_srv=207&pf_tfr=616&pf_dm1=2226&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224.0.0.0%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146.0.7680.164%22%7D%5D%2C%22mobile%22%3Atrue%2C%22model%22%3A%22moto%20g%20power%20(2022)%22%2C%22platform%22%3A%22Android%22%2C%22platformVersion%22%3A%2211.0%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=412x823 — 204 — 82 B — 259 ms — h2https://www.cnrs.fr/themes/custom/cnrs/favicon.icowww.cnrs.fr/themes/custom/cnrs/favi... https://www.cnrs.fr/themes/custom/cnrs/favicon.ico — 200 — 15.1 KiB — 209 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 6081ms · 649KB · €66/mo
www.cnrs.fr
Other
Costly
Execution 3765ms
Transfer 83 KB
Monthly Cost €41/mo
www.cnrs.fr
Other
Costly
Execution 581ms
Transfer 261 KB
Unused 49%
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 564ms
Transfer 0 KB
Monthly Cost €6/mo
www.cnrs.fr
Other
Costly
Execution 562ms
Transfer 82 KB
Monthly Cost €6/mo
static.axept.io
Other
Costly
Execution 473ms
Transfer 183 KB
Unused 46%
Monthly Cost €5/mo
www.cnrs.fr
Other
Optional
Execution 136ms
Transfer 40 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.cnrs.fr adds 3765ms and costs ~€41/month
  • www.cnrs.fr adds 581ms and costs ~€6/month
  • Unattributable adds 564ms and costs ~€6/month
  • www.cnrs.fr adds 562ms and costs ~€6/month
  • static.axept.io adds 473ms and costs ~€5/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.cnrs.fr takes 3765ms 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

www.cnrs.fr takes 581ms 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

Unattributable takes 564ms 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

www.cnrs.fr takes 562ms 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

static.axept.io takes 473ms 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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