Skip to content
https://ademe.fr

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
1
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
100
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.

1.77 s

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

2.33 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.

0.084

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

1.85 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.

2.33 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
8 PASS 4 REVIEW 1 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 (1.2 MiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
B
Page Weight Budget
1.2 MB transferred, 45 requests
REVIEW
1.2 MB transferred, 45 requests
Info::
Page weighs 2.2 MB (1.2 MB transferred)
Info::
45 HTTP requests
Info::
Estimated 0.25 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
45 requests
0.25 g CO2 per page load
Images 828.0 KiB 67%
JavaScript 255.4 KiB 21%
Fonts 81.8 KiB 7%
CSS 41.9 KiB 3%
HTML 21.1 KiB 2%
Other 1.2 KiB 0%
Other 147 B 0%
Other 86 B 0%
0 2.4 MB 4.9 MB
Under budget
B
Image Optimization
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Info::
All images are well-optimized
18 images 828 KB
0 oversized -0 KB
6 legacy format
0 missing dimensions CLS risk
B
JS Bundles
15 scripts, 95 KB unused
REVIEW
15 scripts, 95 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5KQ...: 68 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.tarteaucitron.io/tarteaucitron.service...: 27 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 95 KB
95 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-5KQTZDQP124 KB68 KB (55%)✓3rd
https://cdn.tarteaucitron.io/tarteaucitron.services.min.js?v=1.32.036 KB27 KB (75%)✓3rd
https://www.ademe.fr/wp-content/themes/ademe/js/scripts.min.js?ver=e6728d2 KB—✓3rd
https://www.ademe.fr/wp-content/plugins/who-at-internet/js/who_ati.js0 KB—✓3rd
https://cdntag.tarteaucitron.io/load.js?domain=www.ademe.fr&uuid=2df1000bf385655312abede8e30421664e7d594e23 KB—✓3rd
https://www.ademe.fr/wp-content/cache/min/1/wp-content/plugins/notibar/assets/frontend/js/notibar.js?ver=17762447423 KB—✓3rd
https://www.ademe.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.129 KB—✓3rd
https://www.ademe.fr/wp-content/cache/min/1/wp-content/themes/ademe/dist/theme/front.js?ver=17762447422 KB—✓3rd
https://www.ademe.fr/wp-content/plugins/wp-rocket/assets/js/lazyload/17.8.3/lazyload.min.js3 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 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

C
Page Weight Inventory
Action
45 resources · 1.2 MB · 95 KB savings available
REVIEW
45 resources · 1.2 MB · 95 KB savings available
Warning::
Page weight 206 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~95 KB of savings available
Warning::
44 third-party resources (100% of weight)
Info::
1 resources over 200KB
45 resources · 1.2 MiB · 44 third-party 205.6 KiB over 1MB target
Image 67% · 828.5 KiB
JavaScript 21% · 255.4 KiB
Font 7% · 81.8 KiB
CSS 3% · 41.9 KiB
Document 2% · 21.8 KiB
Other 0% · 233 B

~94.6 KiB of savings available

Remove unused JavaScript: 94.6 KiB
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
127ms total JS execution
PASS
127ms total JS execution
Info::
https://www.ademe.fr/: 64ms CPU time
Info::
https://www.ademe.fr/wp-includes/js/jquery/jquery....: 63ms CPU time
Warning::
Third-party scripts: 127ms (100% of total)

Main Thread Breakdown

Script Evaluation 36% Other 26% Style & Layout 18% Script Parsing & Compilation 8% Parse HTML & CSS 6% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.ademe.fr/64ms7ms1ms3rd
https://www.ademe.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.163ms25ms2ms3rd
A+
Font Loading
2 fonts (82 KB)
PASS
2 fonts (82 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

82 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.8 s LCP 2.3 shttps://www.ademe.fr/wp-content/themes/ademe/dist/fonts/Marianne-Regular.woff2Marianne-Regular.woff2 https://www.ademe.fr/wp-content/themes/ademe/dist/fonts/Marianne-Regular.woff2 — 40.5 KiB — 26 ms — font-display: swaphttps://www.ademe.fr/wp-content/themes/ademe/dist/fonts/Marianne-Bold.woff2Marianne-Bold.woff2 https://www.ademe.fr/wp-content/themes/ademe/dist/fonts/Marianne-Bold.woff2 — 41.3 KiB — 25 ms — font-display: swap
Marianne-Regular.woff2 woff2 swap
Size 40 KB
Load time 26 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
Marianne-Bold.woff2 woff2 swap
Size 41 KB
Load time 25 ms
Start 1.0 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)
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: Cloudflare

A
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
45 requests over 2348ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.8 s LCP 2.3 shttps://ademe.fr// https://ademe.fr/ — 301 — 510 B — 738 ms — h2https://www.ademe.fr/www.ademe.fr/ https://www.ademe.fr/ — 200 — 21.1 KiB — 72 ms — h2https://www.ademe.fr/wp-content/themes/ademe/dist/images/img-home.webpwww.ademe.fr/wp-content/themes/adem... https://www.ademe.fr/wp-content/themes/ademe/dist/images/img-home.webp — 200 — 558.1 KiB — 87 ms — h2https://www.ademe.fr/wp-includes/css/dist/block-library/style.min.css?ver=e6728dwww.ademe.fr/wp-includes/css/dist/b... https://www.ademe.fr/wp-includes/css/dist/block-library/style.min.css?ver=e6728d — 200 — 14.3 KiB — 32 ms — h2https://www.ademe.fr/wp-content/cache/min/1/wp-content/plugins/notibar/assets/frontend/css/notibar.css?ver=1776244742www.ademe.fr/wp-content/cache/min/1... https://www.ademe.fr/wp-content/cache/min/1/wp-content/plugins/notibar/assets/frontend/css/notibar.css?ver=1776244742 — 200 — 904 B — 52 ms — h2https://www.ademe.fr/wp-content/cache/min/1/wp-content/themes/ademe/dist/theme/front.css?ver=1776244742www.ademe.fr/wp-content/cache/min/1... https://www.ademe.fr/wp-content/cache/min/1/wp-content/themes/ademe/dist/theme/front.css?ver=1776244742 — 200 — 20.9 KiB — 52 ms — h2https://www.ademe.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.ademe.fr/wp-includes/js/jquery/... https://www.ademe.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 29.1 KiB — 36 ms — h2https://www.ademe.fr/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1www.ademe.fr/wp-includes/js/jquery/... https://www.ademe.fr/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 4.7 KiB — 33 ms — h2https://tarteaucitron.io/load.js?domain=www.ademe.fr&uuid=2df1000bf385655312abede8e30421664e7d594etarteaucitron.io/load.js?domain=www... https://tarteaucitron.io/load.js?domain=www.ademe.fr&uuid=2df1000bf385655312abede8e30421664e7d594e — 301 — 203 B — 66 ms — h2https://www.ademe.fr/wp-content/uploads/2022/03/logorf.svgwww.ademe.fr/wp-content/uploads/202... https://www.ademe.fr/wp-content/uploads/2022/03/logorf.svg — 200 — 14.7 KiB — 72 ms — h2https://www.ademe.fr/wp-content/uploads/2022/11/france2030-logotype-rouge-bleu-v2.pngwww.ademe.fr/wp-content/uploads/202... https://www.ademe.fr/wp-content/uploads/2022/11/france2030-logotype-rouge-bleu-v2.png — 200 — 7.6 KiB — 35 ms — h2https://www.ademe.fr/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.jswww.ademe.fr/cdn-cgi/scripts/5c5dd7... https://www.ademe.fr/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 809 B — 22 ms — h2https://www.ademe.fr/wp-content/plugins/who-at-internet/js/who_ati.jswww.ademe.fr/wp-content/plugins/who... https://www.ademe.fr/wp-content/plugins/who-at-internet/js/who_ati.js — 200 — 459 B — 54 ms — h2https://cdntag.tarteaucitron.io/load.js?domain=www.ademe.fr&uuid=2df1000bf385655312abede8e30421664e7d594ecdntag.tarteaucitron.io/load.js?dom... https://cdntag.tarteaucitron.io/load.js?domain=www.ademe.fr&uuid=2df1000bf385655312abede8e30421664e7d594e — 200 — 22.8 KiB — 83 ms — h2https://www.ademe.fr/wp-content/cache/min/1/wp-content/plugins/notibar/assets/frontend/js/notibar.js?ver=1776244742www.ademe.fr/wp-content/cache/min/1... https://www.ademe.fr/wp-content/cache/min/1/wp-content/plugins/notibar/assets/frontend/js/notibar.js?ver=1776244742 — 200 — 2.9 KiB — 27 ms — h2https://www.ademe.fr/wp-content/themes/ademe/js/scripts.min.js?ver=e6728dwww.ademe.fr/wp-content/themes/adem... https://www.ademe.fr/wp-content/themes/ademe/js/scripts.min.js?ver=e6728d — 200 — 1.6 KiB — 26 ms — h2https://www.ademe.fr/wp-content/cache/min/1/wp-content/themes/ademe/dist/theme/front.js?ver=1776244742www.ademe.fr/wp-content/cache/min/1... https://www.ademe.fr/wp-content/cache/min/1/wp-content/themes/ademe/dist/theme/front.js?ver=1776244742 — 200 — 1.5 KiB — 25 ms — h2https://www.ademe.fr/wp-content/uploads/2022/11/ademe-logo-2022-1.svgwww.ademe.fr/wp-content/uploads/202... https://www.ademe.fr/wp-content/uploads/2022/11/ademe-logo-2022-1.svg — 200 — 4.3 KiB — 27 ms — h2https://www.ademe.fr/wp-content/plugins/wp-rocket/assets/js/lazyload/17.8.3/lazyload.min.jswww.ademe.fr/wp-content/plugins/wp-... https://www.ademe.fr/wp-content/plugins/wp-rocket/assets/js/lazyload/17.8.3/lazyload.min.js — 200 — 2.9 KiB — 29 ms — h2https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 64 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-5KQTZDQPwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-5KQTZDQP — 200 — 123.6 KiB — 142 ms — h2data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20160%20192'%3E%3C/…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20160%20192'%3E%3C/… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20424%20489'%3E%3C/…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20424%20489'%3E%3C/… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20240%20176'%3E%3C/…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20240%20176'%3E%3C/… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20245%20143'%3E%3C/…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20245%20143'%3E%3C/… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20150%20109'%3E%3C/…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20150%20109'%3E%3C/… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20258%2034'%3E%3C/s…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20258%2034'%3E%3C/s… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20222%2036'%3E%3C/s…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20222%2036'%3E%3C/s… — 200 — 0 B — 0 ms — datahttps://www.ademe.fr/wp-content/themes/ademe/dist/images/img-home-mobile.webpwww.ademe.fr/wp-content/themes/adem... https://www.ademe.fr/wp-content/themes/ademe/dist/images/img-home-mobile.webp — 200 — 141.0 KiB — 28 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.8 s LCP 2.3 shttps://ademe.fr// https://ademe.fr/ — 301 — 510 B — 738 ms — h2https://www.ademe.fr/www.ademe.fr/ https://www.ademe.fr/ — 200 — 21.1 KiB — 72 ms — h2https://www.ademe.fr/wp-content/themes/ademe/dist/images/img-home.webpwww.ademe.fr/wp-content/themes/adem... https://www.ademe.fr/wp-content/themes/ademe/dist/images/img-home.webp — 200 — 558.1 KiB — 87 ms — h2https://www.ademe.fr/wp-includes/css/dist/block-library/style.min.css?ver=e6728dwww.ademe.fr/wp-includes/css/dist/b... https://www.ademe.fr/wp-includes/css/dist/block-library/style.min.css?ver=e6728d — 200 — 14.3 KiB — 32 ms — h2https://www.ademe.fr/wp-content/cache/min/1/wp-content/plugins/notibar/assets/frontend/css/notibar.css?ver=1776244742www.ademe.fr/wp-content/cache/min/1... https://www.ademe.fr/wp-content/cache/min/1/wp-content/plugins/notibar/assets/frontend/css/notibar.css?ver=1776244742 — 200 — 904 B — 52 ms — h2https://www.ademe.fr/wp-content/cache/min/1/wp-content/themes/ademe/dist/theme/front.css?ver=1776244742www.ademe.fr/wp-content/cache/min/1... https://www.ademe.fr/wp-content/cache/min/1/wp-content/themes/ademe/dist/theme/front.css?ver=1776244742 — 200 — 20.9 KiB — 52 ms — h2https://www.ademe.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.ademe.fr/wp-includes/js/jquery/... https://www.ademe.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 29.1 KiB — 36 ms — h2https://www.ademe.fr/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1www.ademe.fr/wp-includes/js/jquery/... https://www.ademe.fr/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 4.7 KiB — 33 ms — h2https://tarteaucitron.io/load.js?domain=www.ademe.fr&uuid=2df1000bf385655312abede8e30421664e7d594etarteaucitron.io/load.js?domain=www... https://tarteaucitron.io/load.js?domain=www.ademe.fr&uuid=2df1000bf385655312abede8e30421664e7d594e — 301 — 203 B — 66 ms — h2https://www.ademe.fr/wp-content/uploads/2022/03/logorf.svgwww.ademe.fr/wp-content/uploads/202... https://www.ademe.fr/wp-content/uploads/2022/03/logorf.svg — 200 — 14.7 KiB — 72 ms — h2https://www.ademe.fr/wp-content/uploads/2022/11/france2030-logotype-rouge-bleu-v2.pngwww.ademe.fr/wp-content/uploads/202... https://www.ademe.fr/wp-content/uploads/2022/11/france2030-logotype-rouge-bleu-v2.png — 200 — 7.6 KiB — 35 ms — h2https://www.ademe.fr/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.jswww.ademe.fr/cdn-cgi/scripts/5c5dd7... https://www.ademe.fr/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 809 B — 22 ms — h2https://www.ademe.fr/wp-content/plugins/who-at-internet/js/who_ati.jswww.ademe.fr/wp-content/plugins/who... https://www.ademe.fr/wp-content/plugins/who-at-internet/js/who_ati.js — 200 — 459 B — 54 ms — h2https://cdntag.tarteaucitron.io/load.js?domain=www.ademe.fr&uuid=2df1000bf385655312abede8e30421664e7d594ecdntag.tarteaucitron.io/load.js?dom... https://cdntag.tarteaucitron.io/load.js?domain=www.ademe.fr&uuid=2df1000bf385655312abede8e30421664e7d594e — 200 — 22.8 KiB — 83 ms — h2https://www.ademe.fr/wp-content/cache/min/1/wp-content/plugins/notibar/assets/frontend/js/notibar.js?ver=1776244742www.ademe.fr/wp-content/cache/min/1... https://www.ademe.fr/wp-content/cache/min/1/wp-content/plugins/notibar/assets/frontend/js/notibar.js?ver=1776244742 — 200 — 2.9 KiB — 27 ms — h2https://www.ademe.fr/wp-content/themes/ademe/js/scripts.min.js?ver=e6728dwww.ademe.fr/wp-content/themes/adem... https://www.ademe.fr/wp-content/themes/ademe/js/scripts.min.js?ver=e6728d — 200 — 1.6 KiB — 26 ms — h2https://www.ademe.fr/wp-content/cache/min/1/wp-content/themes/ademe/dist/theme/front.js?ver=1776244742www.ademe.fr/wp-content/cache/min/1... https://www.ademe.fr/wp-content/cache/min/1/wp-content/themes/ademe/dist/theme/front.js?ver=1776244742 — 200 — 1.5 KiB — 25 ms — h2https://www.ademe.fr/wp-content/uploads/2022/11/ademe-logo-2022-1.svgwww.ademe.fr/wp-content/uploads/202... https://www.ademe.fr/wp-content/uploads/2022/11/ademe-logo-2022-1.svg — 200 — 4.3 KiB — 27 ms — h2https://www.ademe.fr/wp-content/plugins/wp-rocket/assets/js/lazyload/17.8.3/lazyload.min.jswww.ademe.fr/wp-content/plugins/wp-... https://www.ademe.fr/wp-content/plugins/wp-rocket/assets/js/lazyload/17.8.3/lazyload.min.js — 200 — 2.9 KiB — 29 ms — h2https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 64 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-5KQTZDQPwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-5KQTZDQP — 200 — 123.6 KiB — 142 ms — h2data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20160%20192'%3E%3C/…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20160%20192'%3E%3C/… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20424%20489'%3E%3C/…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20424%20489'%3E%3C/… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20240%20176'%3E%3C/…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20240%20176'%3E%3C/… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20245%20143'%3E%3C/…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20245%20143'%3E%3C/… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20150%20109'%3E%3C/…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20150%20109'%3E%3C/… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20258%2034'%3E%3C/s…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20258%2034'%3E%3C/s… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20222%2036'%3E%3C/s…www.w3.org/2000/svg'%20viewBox='0%2... data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20222%2036'%3E%3C/s… — 200 — 0 B — 0 ms — datahttps://www.ademe.fr/wp-content/themes/ademe/dist/images/img-home-mobile.webpwww.ademe.fr/wp-content/themes/adem... https://www.ademe.fr/wp-content/themes/ademe/dist/images/img-home-mobile.webp — 200 — 141.0 KiB — 28 ms — h2data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4NCjxzdmcgeG1sbnM9Imh0d…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4NCjxzdmcgeG1sbnM9Imh0d… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIGZpbGw9Im5vbmUiIHZpZ…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIGZpbGw9Im5vbmUiIHZpZ… — 200 — 0 B — 0 ms — datahttps://www.ademe.fr/wp-content/themes/ademe/dist/images/map-dark.pngwww.ademe.fr/wp-content/themes/adem... https://www.ademe.fr/wp-content/themes/ademe/dist/images/map-dark.png — 200 — 87.2 KiB — 32 ms — h2https://www.ademe.fr/wp-content/themes/ademe/dist/fonts/Marianne-Regular.woff2www.ademe.fr/wp-content/themes/adem... https://www.ademe.fr/wp-content/themes/ademe/dist/fonts/Marianne-Regular.woff2 — 200 — 40.5 KiB — 26 ms — h2https://www.ademe.fr/wp-content/themes/ademe/dist/fonts/Marianne-Bold.woff2www.ademe.fr/wp-content/themes/adem... https://www.ademe.fr/wp-content/themes/ademe/dist/fonts/Marianne-Bold.woff2 — 200 — 41.3 KiB — 25 ms — h2https://www.ademe.fr/wp-content/uploads/2022/03/douai.pngwww.ademe.fr/wp-content/uploads/202... https://www.ademe.fr/wp-content/uploads/2022/03/douai.png — 200 — 3.0 KiB — 27 ms — h2https://www.ademe.fr/wp-content/uploads/2022/09/francois-boisleu.jpgwww.ademe.fr/wp-content/uploads/202... https://www.ademe.fr/wp-content/uploads/2022/09/francois-boisleu.jpg — 200 — 12.0 KiB — 26 ms — h2https://jwaf.ademe.fr/evE688.js?2jwaf.ademe.fr/evE688.js?2 https://jwaf.ademe.fr/evE688.js?2 — 200 — 14.1 KiB — 100 ms — http/1.1https://cdn.tarteaucitron.io/css/tarteaucitron.min.css?v=1.32.0cdn.tarteaucitron.io/css/tarteaucit... https://cdn.tarteaucitron.io/css/tarteaucitron.min.css?v=1.32.0 — 200 — 5.8 KiB — 21 ms — h2https://cdn.tarteaucitron.io/lang/tarteaucitron.fr.min.js?v=1.32.0cdn.tarteaucitron.io/lang/tarteauci... https://cdn.tarteaucitron.io/lang/tarteaucitron.fr.min.js?v=1.32.0 — 200 — 1.8 KiB — 22 ms — h2https://www.ademe.fr/cdn-cgi/rum?www.ademe.fr/cdn-cgi/rum? https://www.ademe.fr/cdn-cgi/rum? — 204 — 147 B — 21 ms — h2https://jwaf.ademe.fr/col586a/-/1717721348?sd=24&ss=800x600&fra=0&evariant=2-4&url=https%3A%2F%2Fwww.ademe.fr%2F&jwaf.ademe.fr/col586a/-/1717721348?... https://jwaf.ademe.fr/col586a/-/1717721348?sd=24&ss=800x600&fra=0&evariant=2-4&url=https%3A%2F%2Fwww.ademe.fr%2F& — 200 — 2.5 KiB — 36 ms — http/1.1https://www.ademe.fr/wp-content/uploads/2022/03/favicon.pngwww.ademe.fr/wp-content/uploads/202... https://www.ademe.fr/wp-content/uploads/2022/03/favicon.png — 200 — 536 B — 26 ms — h2https://cdn.tarteaucitron.io/tarteaucitron.services.min.js?v=1.32.0cdn.tarteaucitron.io/tarteaucitron.... https://cdn.tarteaucitron.io/tarteaucitron.services.min.js?v=1.32.0 — 200 — 36.0 KiB — 22 ms — h2https://logs.tarteaucitron.io/collectlogs.tarteaucitron.io/collect https://logs.tarteaucitron.io/collect — 204 — 86 B — 26 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 127ms · 50KB · €1/mo
www.ademe.fr
Other
Optional
Execution 64ms
Transfer 21 KB
Monthly Cost €1/mo
www.ademe.fr
Other
Optional
Execution 63ms
Transfer 29 KB
Monthly Cost €1/mo

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

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.

Send Feedback