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https://cnrs.fr

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
53
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
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.

1.47 s

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

2.87 s

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

456 ms

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

0.003

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

2.83 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.

4.52 s

Page Load Progression

807 ms
1.6 s
2.4 s
3.2 s
4.0 s
4.8 s
5.6 s
6.5 s
Checks
15
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 63 requests
FIX
2.2 MB transferred, 63 requests
Info::
Page weighs 4.3 MB (2.2 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
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::
63 HTTP requests
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
63 requests
0.46 g CO2 per page load
Images 1.2 MiB 55%
JavaScript 715.5 KiB 32%
Fonts 128.3 KiB 6%
HTML 87.8 KiB 4%
CSS 49.4 KiB 2%
Other 16.9 KiB 1%
Other 14.2 KiB 1%
Other 707 B 0%
Other 451 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
63 resources · 2.2 MB · 268 KB savings available
FIX
63 resources · 2.2 MB · 268 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~268 KB of savings available
Warning::
62 third-party resources (100% of weight)
Info::
2 resources over 200KB
63 resources · 2.2 MiB · 62 third-party 1.2 MiB over 1MB target
Image 56% · 1.2 MiB
JavaScript 32% · 715.5 KiB
Font 6% · 128.3 KiB
Document 4% · 90.2 KiB
CSS 2% · 49.4 KiB
Other 1% · 14.6 KiB

~267.9 KiB of savings available

Remove unused JavaScript: 267.9 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
Image Optimization
Action
23 images, 0 KB saveable
REVIEW
23 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.
Warning::
https://www.cnrs.fr/themes/custom/cnrs/img/icons/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23 images 1.2 MB
0 oversized -0 KB
10 legacy format
2 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

C
JS Execution Cost
Action
1474ms total JS execution
REVIEW
1474ms total JS execution
Warning::
https://www.cnrs.fr/TSPD/087dc22938ab2000cc40d18b6...: 885ms CPU time
Info::
https://www.cnrs.fr/fr: 158ms CPU time
Info::
Unattributable: 157ms CPU time
Info::
https://www.cnrs.fr/libraries/MathJax/es5/tex-mml-...: 153ms CPU time
Info::
https://static.axept.io/sdk.js: 120ms CPU time
Warning::
Third-party scripts: 1474ms (100% of total)

Main Thread Breakdown

Script Evaluation 72% Other 12% Style & Layout 6% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.cnrs.fr/TSPD/087dc22938ab2000cc40d18b6180f1c9470cce7869b54a973706b8455c5ba78e31e69f1b12116914?type=8885ms867ms8ms3rd
https://www.cnrs.fr/fr158ms4ms1ms3rd
Unattributable157ms4ms0ms3rd
https://www.cnrs.fr/libraries/MathJax/es5/tex-mml-chtml.js153ms106ms43ms3rd
https://static.axept.io/sdk.js120ms98ms21ms3rd
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://statistiques.cnrs.fr/matomo.js22 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
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://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://player.ausha.co/ausha-player.js1 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 1.5 s LCP 2.9 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 — 316 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 — 315 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 — 513 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 — 513 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 — 513 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 — 512 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 — 17.6 KiB — 512 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 — 14.3 KiB — 210 ms — font-display: swap
libre-franklin-v7-latin... woff2 swap
Size 14 KB
Load time 316 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
fontello.woff woff swap
Size 14 KB
Load time 315 ms
Start 2.0 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 513 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
chivo-v12-latin-700.woff2 woff2 swap
Size 17 KB
Load time 513 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
rubik-v12-latin-regular... woff2 swap
Size 19 KB
Load time 513 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
libre-franklin-v7-latin... woff2 swap
Size 14 KB
Load time 512 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
chivo-v12-latin-900.woff2 woff2 swap
Size 18 KB
Load time 512 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
libre-franklin-v7-latin... woff2 swap
Size 14 KB
Load time 210 ms
Start 6.2 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+
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
63 requests over 6842ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 1.5 s LCP 2.9 shttps://cnrs.fr// https://cnrs.fr/ — 302 — 406 B — 830 ms — h2https://www.cnrs.fr/www.cnrs.fr/ https://www.cnrs.fr/ — 301 — 1.3 KiB — 217 ms — h2https://www.cnrs.fr/frwww.cnrs.fr/fr https://www.cnrs.fr/fr — 200 — 81.5 KiB — 679 ms — h2https://www.cnrs.fr/TSPD/?type=18www.cnrs.fr/TSPD/?type=18 https://www.cnrs.fr/TSPD/?type=18 — 200 — 2.9 KiB — 606 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 — 616 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 — 616 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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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 1474ms · 609KB · €16/mo
www.cnrs.fr
Other
Costly
Execution 885ms
Transfer 83 KB
Monthly Cost €10/mo
www.cnrs.fr
Other
Optional
Execution 158ms
Transfer 82 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 157ms
Transfer 0 KB
Monthly Cost €2/mo
www.cnrs.fr
Other
Optional
Execution 153ms
Transfer 261 KB
Unused 49%
Monthly Cost €2/mo
static.axept.io
Other
Optional
Execution 120ms
Transfer 183 KB
Unused 46%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.cnrs.fr adds 885ms and costs ~€10/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 885ms 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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