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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
29
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.
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.

6.50 s

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

28.51 s

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

2.09 s

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

0.093

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

6.61 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.

28.53 s

Page Load Progression

635 ms
1.3 s
1.9 s
2.5 s
3.2 s
3.8 s
4.4 s
5.1 s
Checks
17
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 83 requests
FIX
4.7 MB transferred, 83 requests
Critical::
Page weighs 8.7 MB (4.7 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::
83 HTTP requests
Info::
Estimated 0.99 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
83 requests
0.99 g CO2 per page load
Other 3.1 MiB 66%
JavaScript 1.2 MiB 24%
Fonts 178.3 KiB 4%
Images 170.6 KiB 4%
HTML 49.6 KiB 1%
Other 41.9 KiB 1%
Other 4.7 KiB 0%
CSS 4.5 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 (4.7 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
9971ms total JS execution
FIX
9971ms total JS execution
Warning::
https://www.sanofi.com/static/entry.client-Cy_d_QM...: 2938ms CPU time
Warning::
https://www.sanofi.com/en: 1971ms CPU time
Warning::
https://www.sanofi.com/static/AppLayout-6piovGy6.j...: 1713ms CPU time
Warning::
Unattributable: 1514ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N67...: 689ms CPU time
Warning::
Third-party scripts: 9971ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Other 23% Style & Layout 13% Rendering 9% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.sanofi.com/static/entry.client-Cy_d_QM4.js2938ms2417ms5ms3rd
https://www.sanofi.com/en1971ms30ms22ms3rd
https://www.sanofi.com/static/AppLayout-6piovGy6.js1713ms593ms8ms3rd
Unattributable1514ms383ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N67QVH3689ms368ms197ms3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js392ms253ms74ms3rd
https://maps.googleapis.com/maps/api/js?key=AIzaSyBcnZwd_VnGoXhzYuIwB1OmktJT8JqHtdg&libraries=places364ms216ms138ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W5BRX7C2&gtm=4e64k1306ms218ms83ms3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js84ms58ms7ms3rd
F
JS Bundles
Action
16 scripts, 585 KB unused
FIX
16 scripts, 585 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: 585 KB
585 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 (57%)✓3rd
https://www.sanofi.com/static/_-vblXRpCY.js19 KB—✓3rd
https://www.sanofi.com/static/manifest-51aeedb4.js1 KB—✓3rd
https://www.sanofi.com/static/index-DsIgsxMG.js3 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

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
83 resources · 4.7 MB · 585 KB savings available
FIX
83 resources · 4.7 MB · 585 KB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~585 KB of savings available
Warning::
82 third-party resources (100% of weight)
Info::
2 resources over 200KB
83 resources · 4.7 MiB · 82 third-party 3.7 MiB over 1MB target
Media 66% · 3.1 MiB
JavaScript 24% · 1.2 MiB
Font 4% · 178.3 KiB
Image 4% · 174.7 KiB
Document 1% · 49.8 KiB
Other 1% · 43.2 KiB
CSS 0% · 9.1 KiB

~585.0 KiB of savings available

Remove unused JavaScript: 585.0 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
25 images, 0 KB saveable
PASS
25 images, 0 KB saveable
Info::
All images are well-optimized
25 images 171 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
8 fonts (178 KB)
PASS
8 fonts (178 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

178 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 6.5 s LCP 28.5 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 — 28 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 — 37 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 — 0 B — 148 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 — 111 ms — font-display: swaphttps://cdn.prod.accelerator.sanofi/fonts/sanofi-serif/ttf/SanofiSerif-BoldItalic.ttfSanofiSerif-BoldItalic.ttf https://cdn.prod.accelerator.sanofi/fonts/sanofi-serif/ttf/SanofiSerif-BoldItalic.ttf — 31.6 KiB — 17 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 — 0 B — 112 ms — font-display: swaphttps://cdn.prod.accelerator.sanofi/fonts/sanofi-sans/woff2/Sanofi_Sans-Bold.woff2Sanofi_Sans-Bold.woff2 https://cdn.prod.accelerator.sanofi/fonts/sanofi-sans/woff2/Sanofi_Sans-Bold.woff2 — 27.6 KiB — 36 ms — font-display: swaphttps://cdn.prod.accelerator.sanofi/fonts/sanofi-sans/woff2/Sanofi_Sans-Regular.woff2Sanofi_Sans-Regular.woff2 https://cdn.prod.accelerator.sanofi/fonts/sanofi-sans/woff2/Sanofi_Sans-Regular.woff2 — 28.3 KiB — 42 ms — font-display: swap
Sanofi_Sans-Regular-DKL... woff2 swap
Size 28 KB
Load time 28 ms
Start 443 ms
Risk FOUT — text flashes from fallback to web font
Sanofi_Sans-Bold-UKuKMt... woff2 swap
Size 28 KB
Load time 37 ms
Start 444 ms
Risk FOUT — text flashes from fallback to web font
Sanofi_Serif-Bold_Itali... woff2 swap
Size 0 KB
Load time 148 ms
Start 726 ms
Risk FOUT — text flashes from fallback to web font
Sanofi_Serif-Italic.woff2 woff2 swap
Size 35 KB
Load time 111 ms
Start 778 ms
Risk FOUT — text flashes from fallback to web font
SanofiSerif-BoldItalic.ttf ttf swap
Size 32 KB
Load time 17 ms
Start 905 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Sanofi_Serif-Bold_Itali... woff2 swap
Size 0 KB
Load time 112 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
Sanofi_Sans-Bold.woff2 woff2 swap
Size 28 KB
Load time 36 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
Sanofi_Sans-Regular.woff2 woff2 swap
Size 28 KB
Load time 42 ms
Start 1.8 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 ~9 KB and ~18 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
—
preload
2
dns-prefetch
—
prefetch
—

2 resource hints configured

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
83 requests over 4558ms
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 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 6.5 s LCP 28.5 shttps://sanofi.com// https://sanofi.com/ — 301 — 254 B — 61 ms — http/1.1https://www.sanofi.com/www.sanofi.com/ https://www.sanofi.com/ — 308 — 388 B — 336 ms — h2https://www.sanofi.com/enwww.sanofi.com/en https://www.sanofi.com/en — 200 — 49.6 KiB — 21 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 — 28 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 — 37 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 — 30 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 — 80 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 — 67 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 — 48 ms — h2https://www.sanofi.com/static/typeguards-BQZiaZk6.jswww.sanofi.com/static/typeguards-BQ... https://www.sanofi.com/static/typeguards-BQZiaZk6.js — 200 — 461 B — 51 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 — 53 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 — 103 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 — 865 B — 54 ms — h2https://www.sanofi.com/static/_-vblXRpCY.jswww.sanofi.com/static/_-vblXRpCY.js https://www.sanofi.com/static/_-vblXRpCY.js — 200 — 19.1 KiB — 92 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 — 89 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 — 20 ms — h2https://www.sanofi.com/icons/manifest.webmanifestwww.sanofi.com/icons/manifest.webma... https://www.sanofi.com/icons/manifest.webmanifest — 200 — 845 B — 23 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 — 16 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 — 746 B — 13 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 — 3.1 MiB — 431 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 — 839 B — 108 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 — 819 B — 106 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 — 986 B — 106 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 — 839 B — 106 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... 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https://cdn.cookielaw.org/consent/5ba9840f-2af3-4f28-b54d-b9d55e0175d5/574d6568-4390-4fe4-9a3f-e857e3b3ea87/en.json — 200 — 20.7 KiB — 24 ms — h2https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/otCenterRounded.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/otCenterRounded.json — 200 — 2.9 KiB — 9 ms — h2https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/v2/otPcCenter.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/v2/otPcCenter.json — 200 — 13.2 KiB — 16 ms — h2https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/otCommonStyles.csscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202510.2.0/assets/otCommonStyles.css — 200 — 4.6 KiB — 14 ms — h2https://events.launchdarkly.com/events/diagnostic/63779209b9abad1176b1c8deevents.launchdarkly.com/events/diag... https://events.launchdarkly.com/events/diagnostic/63779209b9abad1176b1c8de — 202 — 358 B — 110 ms — h2https://cdn.cookielaw.org/logos/static/ot_guard_logo.svgcdn.cookielaw.org/logos/static/ot_g... https://cdn.cookielaw.org/logos/static/ot_guard_logo.svg — 200 — 489 B — 10 ms — h2https://cdn.cookielaw.org/logos/dd85e611-5592-4331-b346-b8739f63f687/50286c0b-dd93-44d0-993f-6e06483dad9b/46ff713a-4b0b-4c91-8d0c-f5d01ca89ed6/Sanofi_Logo_Webmail.pngcdn.cookielaw.org/logos/dd85e611-55... https://cdn.cookielaw.org/logos/dd85e611-5592-4331-b346-b8739f63f687/50286c0b-dd93-44d0-993f-6e06483dad9b/46ff713a-4b0b-4c91-8d0c-f5d01ca89ed6/Sanofi_Logo_Webmail.png — 200 — 1.7 KiB — 12 ms — h2https://cdn.cookielaw.org/logos/static/powered_by_logo.svgcdn.cookielaw.org/logos/static/powe... https://cdn.cookielaw.org/logos/static/powered_by_logo.svg — 200 — 2.6 KiB — 15 ms — h2https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8deevents.launchdarkly.com/events/bulk... https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8de — 204 — 0 B — 97 ms — h2https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8deevents.launchdarkly.com/events/bulk... https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8de — 204 — 0 B — 99 ms — h2https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8deevents.launchdarkly.com/events/bulk... https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8de — 204 — 0 B — 97 ms — h2https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8deevents.launchdarkly.com/events/bulk... https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8de — 202 — 358 B — 127 ms — h2https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8deevents.launchdarkly.com/events/bulk... https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8de — 202 — 358 B — 97 ms — h2https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8deevents.launchdarkly.com/events/bulk... https://events.launchdarkly.com/events/bulk/63779209b9abad1176b1c8de — 202 — 358 B — 126 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 9971ms · 1133KB · €108/mo
www.sanofi.com
Other
Costly
Execution 2938ms
Transfer 140 KB
Unused 62%
Monthly Cost €32/mo
www.sanofi.com
Other
Costly
Execution 1971ms
Transfer 50 KB
Monthly Cost €21/mo
www.sanofi.com
Other
Costly
Execution 1713ms
Transfer 338 KB
Unused 48%
Monthly Cost €19/mo
Unattributable
Other
Costly
Execution 1514ms
Transfer 0 KB
Monthly Cost €16/mo
Google Tag Manager
Tag Manager
Costly
Execution 689ms
Transfer 163 KB
Unused 50%
Monthly Cost €7/mo
OneTrust
Consent
Essential
Execution 392ms
Transfer 124 KB
Unused 53%
Monthly Cost €4/mo
maps.googleapis.com
Other
Costly
Execution 364ms
Transfer 179 KB
Unused 56%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 306ms
Transfer 130 KB
Unused 50%
Monthly Cost €3/mo
OneTrust
Consent
Essential
Execution 84ms
Transfer 9 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.sanofi.com adds 2938ms and costs ~€32/month
  • www.sanofi.com adds 1971ms and costs ~€21/month
  • www.sanofi.com adds 1713ms and costs ~€19/month
  • Unattributable adds 1514ms and costs ~€16/month
  • Google Tag Manager adds 689ms and costs ~€7/month
  • maps.googleapis.com adds 364ms and costs ~€4/month
  • Google Tag Manager adds 306ms 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 2938ms 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

www.sanofi.com takes 1971ms 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 1713ms 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 1514ms 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

Google Tag Manager takes 689ms 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

maps.googleapis.com takes 364ms 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

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

Google Tag Manager takes 306ms 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

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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