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https://e-monsite.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
2
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
66
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
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.

4.25 s

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

7.40 s

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

56 ms

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

0.000

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

4.25 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.

7.47 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
17
10 PASS 3 REVIEW 2 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 (967.0 KiB of 967.5 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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.

B
Image Optimization
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://www.e-monsite.com/medias/site/logos/logo-e... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 320 KB
0 oversized -0 KB
15 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1353ms total JS execution
REVIEW
1353ms total JS execution
Warning::
https://www.e-monsite.com/: 482ms CPU time
Warning::
Unattributable: 284ms CPU time
Warning::
https://www.e-monsite.com/cdn-cgi/scripts/7d0fa10a...: 270ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-4VN4...: 166ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PNC...: 91ms CPU time
Warning::
Third-party scripts: 1353ms (100% of total)

Main Thread Breakdown

Other 32% Script Evaluation 28% Style & Layout 24% Script Parsing & Compilation 7% Parse HTML & CSS 5% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.e-monsite.com/482ms5ms1ms3rd
Unattributable284ms10ms0ms3rd
https://www.e-monsite.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js270ms113ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-4VN4372P6E166ms137ms28ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PNCK3QB91ms62ms28ms3rd
https://www.e-monsite.com/themes/combined.js?v=7_1642769533_3398&lang=fr60ms20ms15ms3rd
C
JS Bundles
Action
11 scripts, 170 KB unused
REVIEW
11 scripts, 170 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PNC...: 87 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-4VN4...: 62 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.e-monsite.com/medias/static/js/brand-p...: 21 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 170 KB
170 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-PNCK3QB144 KB87 KB (61%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-4VN4372P6E143 KB62 KB (44%)✓3rd
https://www.e-monsite.com/medias/static/js/brand-portal-login-modal/jquery.brand-portal-login-modal.js?v=2024-09-11-v236 KB21 KB (60%)✓3rd
https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/jquery-3.6.3.min.js?v=260120230 KB—✓3rd
https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/popper.min.js?v=310120230 KB—✓3rd
https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/bootstrap.min.js?v=310120230 KB—✓3rd
https://www.e-monsite.com/themes/combined.js?v=7_1642769533_3398&lang=fr0 KB—✓3rd
https://www.e-monsite.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js4 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://analytics.ahrefs.com/analytics.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

A
Page Weight Budget
968 KB transferred, 50 requests
PASS
968 KB transferred, 50 requests
Info::
Page weighs 2.8 MB (968 KB transferred)
Info::
Fonts are 219 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 219 KB
Info::
50 HTTP requests
Info::
Estimated 0.20 g CO2 per page load
968 KB / 2.4 MB budget
968 KB transferred
50 requests
0.20 g CO2 per page load
JavaScript 361.7 KiB 37%
Images 319.6 KiB 33%
Fonts 218.9 KiB 23%
CSS 26.5 KiB 3%
HTML 23.2 KiB 2%
Other 16.1 KiB 2%
Other 772 B 0%
Other 550 B 0%
Other 248 B 0%
0 2.4 MB 4.9 MB
Under budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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
4 fonts (219 KB)
PASS
4 fonts (219 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

219 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 6.0 s 7.0 s FCP 4.2 s LCP 7.4 shttps://www.e-monsite.com/cf-fonts/v/lexend/5.0.18/latin/wght/normal.woff2normal.woff2 https://www.e-monsite.com/cf-fonts/v/lexend/5.0.18/latin/wght/normal.woff2 — 39.3 KiB — 60 ms — font-display: swaphttps://www.e-monsite.com/medias/static/themes/bootstrap_v4/material-icons/font/MaterialIcons.woff2MaterialIcons.woff2 https://www.e-monsite.com/medias/static/themes/bootstrap_v4/material-icons/font/MaterialIcons.woff2 — 68.9 KiB — 51 ms — font-display: swaphttps://www.e-monsite.com/medias/files/fa-brands-400.woff2fa-brands-400.woff2 https://www.e-monsite.com/medias/files/fa-brands-400.woff2 — 105.7 KiB — 76 ms — font-display: swaphttps://www.e-monsite.com/medias/files//fa-v4compatibility.woff2fa-v4compatibility.woff2 https://www.e-monsite.com/medias/files//fa-v4compatibility.woff2 — 5.0 KiB — 67 ms — font-display: swap
normal.woff2 woff2 swap
Size 39 KB
Load time 60 ms
Start 660 ms
Risk FOUT — text flashes from fallback to web font
MaterialIcons.woff2 woff2 swap
Size 69 KB
Load time 51 ms
Start 661 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 106 KB
Load time 76 ms
Start 844 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-v4compatibility.woff2 woff2 swap
Size 5 KB
Load time 67 ms
Start 844 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)

Fixing the unchecked items could save ~53 KB and ~106 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
—
preload
5
dns-prefetch
2
prefetch
—

7 resource hints configured

A
Page Weight Inventory
50 resources · 968 KB · 170 KB savings available
PASS
50 resources · 968 KB · 170 KB savings available
Info::
Within 1MB page-weight target
Got: 968 KB
Info::
~170 KB of savings available
Warning::
49 third-party resources (100% of weight)
50 resources · 967.5 KiB · 49 third-party Within 1MB page-weight target
JavaScript 37% · 361.7 KiB
Image 35% · 334.7 KiB
Font 23% · 218.9 KiB
CSS 3% · 26.5 KiB
Document 2% · 23.7 KiB
Other 0% · 2.0 KiB

~170.4 KiB of savings available

Remove unused JavaScript: 170.4 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
50 requests over 1083ms
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 4.2 s LCP 7.4 shttps://e-monsite.com// https://e-monsite.com/ — 301 — 579 B — 85 ms — h2https://www.e-monsite.com/www.e-monsite.com/ https://www.e-monsite.com/ — 200 — 23.2 KiB — 326 ms — h2https://www.e-monsite.com/cdn-cgi/speculationwww.e-monsite.com/cdn-cgi/speculati... https://www.e-monsite.com/cdn-cgi/speculation — 200 — 456 B — 21 ms — h2https://www.e-monsite.com/themes/combined.css?v=7_1642769533_3398www.e-monsite.com/themes/combined.c... https://www.e-monsite.com/themes/combined.css?v=7_1642769533_3398 — 200 — 0 B — 122 ms — h2https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/jquery-3.6.3.min.js?v=26012023www.e-monsite.com/medias/static/the... https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/jquery-3.6.3.min.js?v=26012023 — 200 — 0 B — 11 ms — h2https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/popper.min.js?v=31012023www.e-monsite.com/medias/static/the... https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/popper.min.js?v=31012023 — 200 — 0 B — 9 ms — h2https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/bootstrap.min.js?v=31012023www.e-monsite.com/medias/static/the... https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/bootstrap.min.js?v=31012023 — 200 — 0 B — 10 ms — h2https://www.e-monsite.com/themes/combined.js?v=7_1642769533_3398&lang=frwww.e-monsite.com/themes/combined.j... https://www.e-monsite.com/themes/combined.js?v=7_1642769533_3398&lang=fr — 200 — 0 B — 12 ms — h2https://www.e-monsite.com/fr/themes/designlines/60d21e81c6e056c014b24b94.css?v=a1ebc642868342f21afd68e5a3d15b7dwww.e-monsite.com/fr/themes/designl... https://www.e-monsite.com/fr/themes/designlines/60d21e81c6e056c014b24b94.css?v=a1ebc642868342f21afd68e5a3d15b7d — 200 — 832 B — 32 ms — h2https://www.e-monsite.com/fr/themes/designlines/60642c9ecee4d4558d13905d.css?v=689c704e3075247fa0a3c8dc4beb3187www.e-monsite.com/fr/themes/designl... https://www.e-monsite.com/fr/themes/designlines/60642c9ecee4d4558d13905d.css?v=689c704e3075247fa0a3c8dc4beb3187 — 200 — 415 B — 33 ms — h2https://fonts.googleapis.com/css?family=Source%20Sans%20Pro:300,300italic,400,400italic,700,700italic%7CLexend:300,300italic,400,400italic,700,700italic&display=swapfonts.googleapis.com/css?family=Sou... https://fonts.googleapis.com/css?family=Source%20Sans%20Pro:300,300italic,400,400italic,700,700italic%7CLexend:300,300italic,400,400italic,700,700italic&display=swap — 200 — 1.5 KiB — 71 ms — h2https://www.e-monsite.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.jswww.e-monsite.com/cdn-cgi/scripts/7... https://www.e-monsite.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js — 200 — 4.2 KiB — 25 ms — h2https://www.e-monsite.com/medias/site/logos/logo-e-monsite-portail.pngwww.e-monsite.com/medias/site/logos... https://www.e-monsite.com/medias/site/logos/logo-e-monsite-portail.png — 200 — 1.7 KiB — 82 ms — h2https://www.e-monsite.com/medias/images/e-confiance-avis-emonsite-2301.webpwww.e-monsite.com/medias/images/e-c... https://www.e-monsite.com/medias/images/e-confiance-avis-emonsite-2301.webp — 200 — 4.6 KiB — 85 ms — h2https://www.e-monsite.com/medias/images/creer-un-site-gratuit-fond.webpwww.e-monsite.com/medias/images/cre... https://www.e-monsite.com/medias/images/creer-un-site-gratuit-fond.webp — 200 — 8.4 KiB — 80 ms — h3https://www.e-monsite.com/medias/images/personnages-1.svgwww.e-monsite.com/medias/images/per... https://www.e-monsite.com/medias/images/personnages-1.svg — 200 — 6.4 KiB — 136 ms — h3https://www.e-monsite.com/medias/images/typographie.pngwww.e-monsite.com/medias/images/typ... https://www.e-monsite.com/medias/images/typographie.png — 200 — 3.4 KiB — 215 ms — h3https://www.e-monsite.com/medias/images/palette-couleur.pngwww.e-monsite.com/medias/images/pal... https://www.e-monsite.com/medias/images/palette-couleur.png — 200 — 1.9 KiB — 218 ms — h3https://www.e-monsite.com/medias/images/pages-1.svgwww.e-monsite.com/medias/images/pag... https://www.e-monsite.com/medias/images/pages-1.svg — 200 — 1.7 KiB — 244 ms — h3https://www.e-monsite.com/medias/images/blog-1.svgwww.e-monsite.com/medias/images/blo... https://www.e-monsite.com/medias/images/blog-1.svg — 200 — 1.7 KiB — 223 ms — h3https://www.e-monsite.com/medias/images/boutique-1.svgwww.e-monsite.com/medias/images/bou... https://www.e-monsite.com/medias/images/boutique-1.svg — 200 — 1.8 KiB — 213 ms — h3https://www.e-monsite.com/medias/images/agenda-1.svgwww.e-monsite.com/medias/images/age... https://www.e-monsite.com/medias/images/agenda-1.svg — 200 — 1.3 KiB — 195 ms — h3https://www.e-monsite.com/medias/images/reservation-1.svgwww.e-monsite.com/medias/images/res... https://www.e-monsite.com/medias/images/reservation-1.svg — 200 — 1.6 KiB — 237 ms — h3https://www.e-monsite.com/medias/images/album-photo-1.svgwww.e-monsite.com/medias/images/alb... https://www.e-monsite.com/medias/images/album-photo-1.svg — 200 — 1.4 KiB — 225 ms — h3https://www.e-monsite.com/medias/images/chatbot-huggy-support-e-monsite-2.webpwww.e-monsite.com/medias/images/cha... https://www.e-monsite.com/medias/images/chatbot-huggy-support-e-monsite-2.webp — 200 — 28.3 KiB — 249 ms — h3https://www.e-monsite.com/medias/images/personnaliser-themes.webpwww.e-monsite.com/medias/images/per... https://www.e-monsite.com/medias/images/personnaliser-themes.webp — 200 — 37.0 KiB — 235 ms — h3https://www.e-monsite.com/medias/images/applications-externes.svgwww.e-monsite.com/medias/images/app... https://www.e-monsite.com/medias/images/applications-externes.svg — 200 — 4.8 KiB — 218 ms — h3https://www.e-monsite.com/medias/images/composants-dynamique-e-monsite.webpwww.e-monsite.com/medias/images/com... https://www.e-monsite.com/medias/images/composants-dynamique-e-monsite.webp — 200 — 45.0 KiB — 261 ms — h3https://www.e-monsite.com/medias/images/webinar25-creer-un-site-miniature.webpwww.e-monsite.com/medias/images/web... https://www.e-monsite.com/medias/images/webinar25-creer-un-site-miniature.webp — 200 — 115.9 KiB — 243 ms — h3https://www.e-monsite.com/medias/images/logo-ems-footer.pngwww.e-monsite.com/medias/images/log... https://www.e-monsite.com/medias/images/logo-ems-footer.png — 200 — 2.0 KiB — 231 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.2 s LCP 7.4 shttps://e-monsite.com// https://e-monsite.com/ — 301 — 579 B — 85 ms — h2https://www.e-monsite.com/www.e-monsite.com/ https://www.e-monsite.com/ — 200 — 23.2 KiB — 326 ms — h2https://www.e-monsite.com/cdn-cgi/speculationwww.e-monsite.com/cdn-cgi/speculati... https://www.e-monsite.com/cdn-cgi/speculation — 200 — 456 B — 21 ms — h2https://www.e-monsite.com/themes/combined.css?v=7_1642769533_3398www.e-monsite.com/themes/combined.c... https://www.e-monsite.com/themes/combined.css?v=7_1642769533_3398 — 200 — 0 B — 122 ms — h2https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/jquery-3.6.3.min.js?v=26012023www.e-monsite.com/medias/static/the... https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/jquery-3.6.3.min.js?v=26012023 — 200 — 0 B — 11 ms — h2https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/popper.min.js?v=31012023www.e-monsite.com/medias/static/the... https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/popper.min.js?v=31012023 — 200 — 0 B — 9 ms — h2https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/bootstrap.min.js?v=31012023www.e-monsite.com/medias/static/the... https://www.e-monsite.com/medias/static/themes/bootstrap_v4/js/bootstrap.min.js?v=31012023 — 200 — 0 B — 10 ms — h2https://www.e-monsite.com/themes/combined.js?v=7_1642769533_3398&lang=frwww.e-monsite.com/themes/combined.j... https://www.e-monsite.com/themes/combined.js?v=7_1642769533_3398&lang=fr — 200 — 0 B — 12 ms — h2https://www.e-monsite.com/fr/themes/designlines/60d21e81c6e056c014b24b94.css?v=a1ebc642868342f21afd68e5a3d15b7dwww.e-monsite.com/fr/themes/designl... https://www.e-monsite.com/fr/themes/designlines/60d21e81c6e056c014b24b94.css?v=a1ebc642868342f21afd68e5a3d15b7d — 200 — 832 B — 32 ms — h2https://www.e-monsite.com/fr/themes/designlines/60642c9ecee4d4558d13905d.css?v=689c704e3075247fa0a3c8dc4beb3187www.e-monsite.com/fr/themes/designl... https://www.e-monsite.com/fr/themes/designlines/60642c9ecee4d4558d13905d.css?v=689c704e3075247fa0a3c8dc4beb3187 — 200 — 415 B — 33 ms — h2https://fonts.googleapis.com/css?family=Source%20Sans%20Pro:300,300italic,400,400italic,700,700italic%7CLexend:300,300italic,400,400italic,700,700italic&display=swapfonts.googleapis.com/css?family=Sou... https://fonts.googleapis.com/css?family=Source%20Sans%20Pro:300,300italic,400,400italic,700,700italic%7CLexend:300,300italic,400,400italic,700,700italic&display=swap — 200 — 1.5 KiB — 71 ms — h2https://www.e-monsite.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.jswww.e-monsite.com/cdn-cgi/scripts/7... https://www.e-monsite.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js — 200 — 4.2 KiB — 25 ms — h2https://www.e-monsite.com/medias/site/logos/logo-e-monsite-portail.pngwww.e-monsite.com/medias/site/logos... https://www.e-monsite.com/medias/site/logos/logo-e-monsite-portail.png — 200 — 1.7 KiB — 82 ms — h2https://www.e-monsite.com/medias/images/e-confiance-avis-emonsite-2301.webpwww.e-monsite.com/medias/images/e-c... https://www.e-monsite.com/medias/images/e-confiance-avis-emonsite-2301.webp — 200 — 4.6 KiB — 85 ms — h2https://www.e-monsite.com/medias/images/creer-un-site-gratuit-fond.webpwww.e-monsite.com/medias/images/cre... https://www.e-monsite.com/medias/images/creer-un-site-gratuit-fond.webp — 200 — 8.4 KiB — 80 ms — h3https://www.e-monsite.com/medias/images/personnages-1.svgwww.e-monsite.com/medias/images/per... https://www.e-monsite.com/medias/images/personnages-1.svg — 200 — 6.4 KiB — 136 ms — h3https://www.e-monsite.com/medias/images/typographie.pngwww.e-monsite.com/medias/images/typ... https://www.e-monsite.com/medias/images/typographie.png — 200 — 3.4 KiB — 215 ms — h3https://www.e-monsite.com/medias/images/palette-couleur.pngwww.e-monsite.com/medias/images/pal... https://www.e-monsite.com/medias/images/palette-couleur.png — 200 — 1.9 KiB — 218 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 1353ms · 314KB · €15/mo
www.e-monsite.com
Other
Costly
Execution 482ms
Transfer 23 KB
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 284ms
Transfer 0 KB
Monthly Cost €3/mo
www.e-monsite.com
Other
Costly
Execution 270ms
Transfer 4 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 166ms
Transfer 143 KB
Unused 44%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 91ms
Transfer 144 KB
Unused 61%
Monthly Cost €1/mo
www.e-monsite.com
Other
Optional
Execution 60ms
Transfer 0 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.e-monsite.com adds 482ms and costs ~€5/month
  • Unattributable adds 284ms and costs ~€3/month
  • www.e-monsite.com adds 270ms 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.e-monsite.com takes 482ms 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 284ms 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.e-monsite.com takes 270ms 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

61% 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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