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https://sanofi.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
1
PASS
6
INFO
2

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

63
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
98
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.43 s

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

4.87 s

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

181 ms

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

0.012

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

2.36 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.

4.88 s

Page Load Progression

632 ms
1.3 s
1.9 s
2.5 s
3.2 s
3.8 s
4.4 s
5.1 s
Checks
15
6 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
5.6 MB transferred, 74 requests
FIX
5.6 MB transferred, 74 requests
Critical::
Page weighs 8.7 MB (5.6 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
74 HTTP requests
Info::
Estimated 1.2 g CO2 per page load
5.6 MB / 2.4 MB budget
5.6 MB transferred
74 requests
1.2 g CO2 per page load
Other 3.9 MiB 71%
JavaScript 1.2 MiB 21%
Images 258.5 KiB 5%
Fonts 124.6 KiB 2%
HTML 49.4 KiB 1%
Other 41.9 KiB 1%
CSS 4.7 KiB 0%
Other 4.3 KiB 0%
Other 4.2 KiB 0%
Other 845 B 0%
Other 450 B 0%
Other 0 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

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 (5.6 MiB of 5.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2277ms total JS execution
FIX
2277ms total JS execution
Warning::
https://www.sanofi.com/static/entry.client-Cy_d_QM...: 809ms CPU time
Warning::
Unattributable: 486ms CPU time
Warning::
https://www.sanofi.com/en: 296ms CPU time
Warning::
https://www.sanofi.com/static/AppLayout-6piovGy6.j...: 282ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-N67...: 123ms CPU time
Warning::
Third-party scripts: 2277ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Other 24% Style & Layout 11% Rendering 4% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.sanofi.com/static/entry.client-Cy_d_QM4.js809ms641ms1ms3rd
Unattributable486ms102ms0ms3rd
https://www.sanofi.com/en296ms7ms5ms3rd
https://www.sanofi.com/static/AppLayout-6piovGy6.js282ms134ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N67QVH3123ms103ms19ms3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js118ms78ms19ms3rd
https://maps.googleapis.com/maps/api/js?key=AIzaSyBcnZwd_VnGoXhzYuIwB1OmktJT8JqHtdg&libraries=places89ms55ms31ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W5BRX7C2&gtm=4e64k175ms58ms16ms3rd
F
JS Bundles
Action
16 scripts, 584 KB unused
FIX
16 scripts, 584 KB unused
Warning::
https://www.sanofi.com/static/AppLayout-6piovGy6.j...: 161 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://maps.googleapis.com/maps/api/js?key=AIzaSy...: 100 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.sanofi.com/static/entry.client-Cy_d_QM...: 83 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N67...: 81 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202510.2...: 66 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 584 KB
584 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.sanofi.com/static/AppLayout-6piovGy6.js338 KB161 KB (48%)3rd
https://maps.googleapis.com/maps/api/js?key=AIzaSyBcnZwd_VnGoXhzYuIwB1OmktJT8JqHtdg&libraries=places179 KB100 KB (56%)3rd
https://www.sanofi.com/static/entry.client-Cy_d_QM4.js140 KB83 KB (62%)3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N67QVH3163 KB81 KB (50%)3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js124 KB66 KB (53%)3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W5BRX7C2&gtm=4e64k1130 KB65 KB (50%)3rd
https://www.sanofi.com/static/emotion-element-f0de968e.browser.esm-EbcDOLxY.js52 KB29 KB (56%)3rd
https://www.sanofi.com/static/_-vblXRpCY.js19 KB3rd
https://www.sanofi.com/static/manifest-51aeedb4.js1 KB3rd
https://www.sanofi.com/static/index-DsIgsxMG.js3 KB3rd

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

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

F
Page Weight Inventory
Action
74 resources · 5.6 MB · 584 KB savings available
FIX
74 resources · 5.6 MB · 584 KB savings available
Warning::
Page weight 4.6 MB over 1MB target
Got: 5.6 MB Expected: ≤ 1 MB
Info::
~584 KB of savings available
Warning::
73 third-party resources (100% of weight)
Info::
2 resources over 200KB
74 resources · 5.6 MiB · 73 third-party 4.6 MiB over 1MB target
Media 71% · 3.9 MiB
JavaScript 21% · 1.2 MiB
Image 5% · 262.6 KiB
Font 2% · 124.6 KiB
Document 1% · 49.7 KiB
Other 1% · 42.7 KiB
CSS 0% · 9.3 KiB

~584.4 KiB of savings available

Remove unused JavaScript: 584.4 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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
Image Optimization
27 images, 0 KB saveable
PASS
27 images, 0 KB saveable
Info::
All images are well-optimized
27 images 259 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
4 fonts (125 KB)
PASS
4 fonts (125 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

125 KB total

Render-blocking

0

of 4

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 FCP 1.4 s LCP 4.9 shttps://www.sanofi.com/static/Sanofi_Sans-Regular-DKL2HgCc.woff2Sanofi_Sans-Regular-DKL... https://www.sanofi.com/static/Sanofi_Sans-Regular-DKL2HgCc.woff2 — 28.4 KiB — 42 ms — font-display: swaphttps://www.sanofi.com/static/Sanofi_Sans-Bold-UKuKMtGt.woff2Sanofi_Sans-Bold-UKuKMt... https://www.sanofi.com/static/Sanofi_Sans-Bold-UKuKMtGt.woff2 — 27.7 KiB — 26 ms — font-display: swaphttps://cdn.prod.accelerator.sanofi/fonts/sanofi-serif/woff2/Sanofi_Serif-Bold_Italic.woff2Sanofi_Serif-Bold_Itali... https://cdn.prod.accelerator.sanofi/fonts/sanofi-serif/woff2/Sanofi_Serif-Bold_Italic.woff2 — 33.8 KiB — 64 ms — font-display: swaphttps://cdn.prod.accelerator.sanofi/fonts/sanofi-serif/woff2/Sanofi_Serif-Italic.woff2Sanofi_Serif-Italic.woff2 https://cdn.prod.accelerator.sanofi/fonts/sanofi-serif/woff2/Sanofi_Serif-Italic.woff2 — 34.7 KiB — 67 ms — font-display: swap
Sanofi_Sans-Regular-DKL... woff2 swap
Size 28 KB
Load time 42 ms
Start 429 ms
Risk FOUT — text flashes from fallback to web font
Sanofi_Sans-Bold-UKuKMt... woff2 swap
Size 28 KB
Load time 26 ms
Start 430 ms
Risk FOUT — text flashes from fallback to web font
Sanofi_Serif-Bold_Itali... woff2 swap
Size 34 KB
Load time 64 ms
Start 757 ms
Risk FOUT — text flashes from fallback to web font
Sanofi_Serif-Italic.woff2 woff2 swap
Size 35 KB
Load time 67 ms
Start 758 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
74 requests over 4423ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.4 s LCP 4.9 shttps://sanofi.com// https://sanofi.com/ — 301 — 254 B — 55 ms — http/1.1https://www.sanofi.com/www.sanofi.com/ https://www.sanofi.com/ — 308 — 389 B — 347 ms — h2https://www.sanofi.com/enwww.sanofi.com/en https://www.sanofi.com/en — 200 — 49.4 KiB — 9 ms — h2https://www.sanofi.com/static/Sanofi_Sans-Regular-DKL2HgCc.woff2www.sanofi.com/static/Sanofi_Sans-R... https://www.sanofi.com/static/Sanofi_Sans-Regular-DKL2HgCc.woff2 — 200 — 28.4 KiB — 42 ms — h2https://www.sanofi.com/static/Sanofi_Sans-Bold-UKuKMtGt.woff2www.sanofi.com/static/Sanofi_Sans-B... https://www.sanofi.com/static/Sanofi_Sans-Bold-UKuKMtGt.woff2 — 200 — 27.7 KiB — 26 ms — h2https://www.sanofi.com/static/manifest-51aeedb4.jswww.sanofi.com/static/manifest-51ae... https://www.sanofi.com/static/manifest-51aeedb4.js — 200 — 1.2 KiB — 19 ms — h2https://www.sanofi.com/static/entry.client-Cy_d_QM4.jswww.sanofi.com/static/entry.client-... https://www.sanofi.com/static/entry.client-Cy_d_QM4.js — 200 — 140.3 KiB — 55 ms — h2https://www.sanofi.com/static/emotion-element-f0de968e.browser.esm-EbcDOLxY.jswww.sanofi.com/static/emotion-eleme... https://www.sanofi.com/static/emotion-element-f0de968e.browser.esm-EbcDOLxY.js — 200 — 51.6 KiB — 48 ms — h2https://www.sanofi.com/static/useLDUser-BCKEBpNt.jswww.sanofi.com/static/useLDUser-BCK... https://www.sanofi.com/static/useLDUser-BCKEBpNt.js — 200 — 1.3 KiB — 28 ms — h2https://www.sanofi.com/static/typeguards-BQZiaZk6.jswww.sanofi.com/static/typeguards-BQ... https://www.sanofi.com/static/typeguards-BQZiaZk6.js — 200 — 463 B — 25 ms — h2https://www.sanofi.com/static/root-CT-imlmn.jswww.sanofi.com/static/root-CT-imlmn... https://www.sanofi.com/static/root-CT-imlmn.js — 200 — 15.0 KiB — 71 ms — h2https://www.sanofi.com/static/AppLayout-6piovGy6.jswww.sanofi.com/static/AppLayout-6pi... https://www.sanofi.com/static/AppLayout-6piovGy6.js — 200 — 338.3 KiB — 88 ms — h2https://www.sanofi.com/static/api.studiesSearch-M1BfAsbI.jswww.sanofi.com/static/api.studiesSe... https://www.sanofi.com/static/api.studiesSearch-M1BfAsbI.js — 200 — 867 B — 43 ms — h2https://www.sanofi.com/static/_-vblXRpCY.jswww.sanofi.com/static/_-vblXRpCY.js https://www.sanofi.com/static/_-vblXRpCY.js — 200 — 19.1 KiB — 72 ms — h2https://www.sanofi.com/static/index-DsIgsxMG.jswww.sanofi.com/static/index-DsIgsxM... https://www.sanofi.com/static/index-DsIgsxMG.js — 200 — 3.2 KiB — 62 ms — h2https://maps.googleapis.com/maps/api/js?key=AIzaSyBcnZwd_VnGoXhzYuIwB1OmktJT8JqHtdg&libraries=placesmaps.googleapis.com/maps/api/js?key... https://maps.googleapis.com/maps/api/js?key=AIzaSyBcnZwd_VnGoXhzYuIwB1OmktJT8JqHtdg&libraries=places — 200 — 178.8 KiB — 99 ms — h2https://www.sanofi.com/static/root-BEz0SzhB.csswww.sanofi.com/static/root-BEz0SzhB... https://www.sanofi.com/static/root-BEz0SzhB.css — 200 — 3.8 KiB — 11 ms — h2https://www.sanofi.com/icons/manifest.webmanifestwww.sanofi.com/icons/manifest.webma... https://www.sanofi.com/icons/manifest.webmanifest — 200 — 845 B — 26 ms — h2https://maps.googleapis.com/maps/api/mapsjs/gen_204?csp_test=truemaps.googleapis.com/maps/api/mapsjs... https://maps.googleapis.com/maps/api/mapsjs/gen_204?csp_test=true — 200 — 45 B — 14 ms — h3https://fonts.googleapis.com/css2?family=Material+Symbols+Rounded:opsz,wght,FILL,GRAD@24,400,0..1,0&display=blockfonts.googleapis.com/css2?family=Ma... https://fonts.googleapis.com/css2?family=Material+Symbols+Rounded:opsz,wght,FILL,GRAD@24,400,0..1,0&display=block — 200 — 904 B — 22 ms — h2https://www.sanofi.com/assets/dot-shared/campaigns/chasing-miracles-brand-campaign/videos/Sanofi-GlobalFilm-Website-Banner.mp4www.sanofi.com/assets/dot-shared/ca... https://www.sanofi.com/assets/dot-shared/campaigns/chasing-miracles-brand-campaign/videos/Sanofi-GlobalFilm-Website-Banner.mp4 — 206 — 3.9 MiB — 200 ms — h2https://www.sanofi.com/optim/dotcom/content-app/events/quaterly-results/2026/2026-q1-2026-results/r-and-d-canada-banafsheh-mehrazma-sanofi_20260312181630.jpg?size=loadwww.sanofi.com/optim/dotcom/content... https://www.sanofi.com/optim/dotcom/content-app/events/quaterly-results/2026/2026-q1-2026-results/r-and-d-canada-banafsheh-mehrazma-sanofi_20260312181630.jpg?size=load — 200 — 840 B — 90 ms — h2https://www.sanofi.com/optim/dotcom/content-app/articles/our-science/2026/shape-matters-inside-molecular-clamp-vaccines/2026-04-molecular-clamp-vaccines-1-clamped-rsv-pre-f-protein_20260414152557.jpg?size=loadwww.sanofi.com/optim/dotcom/content... https://www.sanofi.com/optim/dotcom/content-app/articles/our-science/2026/shape-matters-inside-molecular-clamp-vaccines/2026-04-molecular-clamp-vaccines-1-clamped-rsv-pre-f-protein_20260414152557.jpg?size=load — 200 — 817 B — 89 ms — h2https://www.sanofi.com/optim/dotcom/content-app/articles/your-health/its-time-to-look-beyond-the-bleed/herobanner-beyond-the-bleed_20240906135425.png?size=loadwww.sanofi.com/optim/dotcom/content... https://www.sanofi.com/optim/dotcom/content-app/articles/your-health/its-time-to-look-beyond-the-bleed/herobanner-beyond-the-bleed_20240906135425.png?size=load — 200 — 987 B — 88 ms — h2https://www.sanofi.com/optim/dot-shared/images/people/Banner-image_expedited-approval_20260326122047.jpg?size=loadwww.sanofi.com/optim/dot-shared/ima... https://www.sanofi.com/optim/dot-shared/images/people/Banner-image_expedited-approval_20260326122047.jpg?size=load — 200 — 838 B — 88 ms — h2https://www.sanofi.com/optim/dot-shared/campaigns/chasing-miracles-brand-campaign/videos/celine-multiple-sclerosis-surf-hero-movie-thumbnail_20251027154114.jpg?size=loadwww.sanofi.com/optim/dot-shared/cam... https://www.sanofi.com/optim/dot-shared/campaigns/chasing-miracles-brand-campaign/videos/celine-multiple-sclerosis-surf-hero-movie-thumbnail_20251027154114.jpg?size=load — 200 — 805 B — 87 ms — h2https://www.sanofi.com/optim/dot-shared/campaigns/chasing-miracles-brand-campaign/patients/celine-para-surfer-main_20251028131729.jpg?size=loadwww.sanofi.com/optim/dot-shared/cam... https://www.sanofi.com/optim/dot-shared/campaigns/chasing-miracles-brand-campaign/patients/celine-para-surfer-main_20251028131729.jpg?size=load — 200 — 779 B — 85 ms — h2https://www.sanofi.com/optim/dot-shared/campaigns/chasing-miracles-brand-campaign/patients/xavier-video-thumbnail_20251028131835.jpg?size=loadwww.sanofi.com/optim/dot-shared/cam... https://www.sanofi.com/optim/dot-shared/campaigns/chasing-miracles-brand-campaign/patients/xavier-video-thumbnail_20251028131835.jpg?size=load — 200 — 825 B — 85 ms — h2https://www.sanofi.com/optim/dot-shared/campaigns/chasing-miracles-brand-campaign/scientists/wei-artificial-intelligence-main_20251028131631.jpg?size=loadwww.sanofi.com/optim/dot-shared/cam... https://www.sanofi.com/optim/dot-shared/campaigns/chasing-miracles-brand-campaign/scientists/wei-artificial-intelligence-main_20251028131631.jpg?size=load — 200 — 858 B — 85 ms — h2https://www.sanofi.com/optim/dotcom/pages/images/our-company/our-strategy/herobanner-strategy-4_20230515142620.jpg?size=loadwww.sanofi.com/optim/dotcom/pages/i... https://www.sanofi.com/optim/dotcom/pages/images/our-company/our-strategy/herobanner-strategy-4_20230515142620.jpg?size=load — 200 — 833 B — 85 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.4 s LCP 4.9 shttps://sanofi.com// https://sanofi.com/ — 301 — 254 B — 55 ms — http/1.1https://www.sanofi.com/www.sanofi.com/ https://www.sanofi.com/ — 308 — 389 B — 347 ms — h2https://www.sanofi.com/enwww.sanofi.com/en https://www.sanofi.com/en — 200 — 49.4 KiB — 9 ms — h2https://www.sanofi.com/static/Sanofi_Sans-Regular-DKL2HgCc.woff2www.sanofi.com/static/Sanofi_Sans-R... https://www.sanofi.com/static/Sanofi_Sans-Regular-DKL2HgCc.woff2 — 200 — 28.4 KiB — 42 ms — h2https://www.sanofi.com/static/Sanofi_Sans-Bold-UKuKMtGt.woff2www.sanofi.com/static/Sanofi_Sans-B... https://www.sanofi.com/static/Sanofi_Sans-Bold-UKuKMtGt.woff2 — 200 — 27.7 KiB — 26 ms — h2https://www.sanofi.com/static/manifest-51aeedb4.jswww.sanofi.com/static/manifest-51ae... https://www.sanofi.com/static/manifest-51aeedb4.js — 200 — 1.2 KiB — 19 ms — h2https://www.sanofi.com/static/entry.client-Cy_d_QM4.jswww.sanofi.com/static/entry.client-... 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h2https://www.sanofi.com/static/api.studiesSearch-M1BfAsbI.jswww.sanofi.com/static/api.studiesSe... https://www.sanofi.com/static/api.studiesSearch-M1BfAsbI.js — 200 — 867 B — 43 ms — h2https://www.sanofi.com/static/_-vblXRpCY.jswww.sanofi.com/static/_-vblXRpCY.js https://www.sanofi.com/static/_-vblXRpCY.js — 200 — 19.1 KiB — 72 ms — h2https://www.sanofi.com/static/index-DsIgsxMG.jswww.sanofi.com/static/index-DsIgsxM... https://www.sanofi.com/static/index-DsIgsxMG.js — 200 — 3.2 KiB — 62 ms — h2https://maps.googleapis.com/maps/api/js?key=AIzaSyBcnZwd_VnGoXhzYuIwB1OmktJT8JqHtdg&libraries=placesmaps.googleapis.com/maps/api/js?key... https://maps.googleapis.com/maps/api/js?key=AIzaSyBcnZwd_VnGoXhzYuIwB1OmktJT8JqHtdg&libraries=places — 200 — 178.8 KiB — 99 ms — h2https://www.sanofi.com/static/root-BEz0SzhB.csswww.sanofi.com/static/root-BEz0SzhB... https://www.sanofi.com/static/root-BEz0SzhB.css — 200 — 3.8 KiB — 11 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
100% of JavaScript execution is third-party
First-party Third-party 2277ms · 1124KB · €25/mo
www.sanofi.com
Other
Costly
Execution 809ms
Transfer 140 KB
Unused 62%
Monthly Cost €9/mo
Unattributable
Other
Costly
Execution 486ms
Transfer 0 KB
Monthly Cost €5/mo
www.sanofi.com
Other
Costly
Execution 296ms
Transfer 49 KB
Monthly Cost €3/mo
www.sanofi.com
Other
Costly
Execution 282ms
Transfer 338 KB
Unused 48%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 123ms
Transfer 163 KB
Unused 50%
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 118ms
Transfer 124 KB
Unused 53%
Monthly Cost €1/mo
maps.googleapis.com
Other
Optional
Execution 89ms
Transfer 179 KB
Unused 56%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 75ms
Transfer 130 KB
Unused 50%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.sanofi.com adds 809ms and costs ~€9/month
  • Unattributable adds 486ms and costs ~€5/month
  • www.sanofi.com adds 296ms and costs ~€3/month
  • www.sanofi.com adds 282ms and costs ~€3/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.sanofi.com takes 809ms 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

62% of www.sanofi.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Unattributable takes 486ms 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.sanofi.com takes 296ms 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.sanofi.com takes 282ms 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

53% of OneTrust's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

56% of maps.googleapis.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

50% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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