Skip to content
https://louvre.fr

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

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

4.10 s

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

8.36 s

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

414 ms

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

0.002

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

5.48 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.

10.07 s

Page Load Progression

574 ms
1.1 s
1.7 s
2.3 s
2.9 s
3.4 s
4.0 s
4.6 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 74 requests
FIX
3.7 MB transferred, 74 requests
Warning::
Page weighs 4.2 MB (3.7 MB transferred)
Warning::
JavaScript is 621 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 621 KB
Info::
74 HTTP requests
Info::
Estimated 0.77 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
74 requests
0.77 g CO2 per page load
Other 2.3 MiB 64%
JavaScript 620.7 KiB 16%
HTML 360.5 KiB 10%
Images 251.1 KiB 7%
Fonts 76.5 KiB 2%
CSS 44.9 KiB 1%
Other 24.0 KiB 1%
Other 745 B 0%
Other 327 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 (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3457ms total JS execution
FIX
3457ms total JS execution
Warning::
https://www.louvre.fr/: 823ms CPU time
Warning::
https://www.louvre.fr/_next/static/chunks/framewor...: 820ms CPU time
Warning::
Unattributable: 714ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W7N...: 396ms CPU time
Info::
https://www.louvre.fr/_next/static/chunks/7701.355...: 250ms CPU time
Warning::
Third-party scripts: 3457ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Other 30% Style & Layout 16% Parse HTML & CSS 4% Script Parsing & Compilation 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.louvre.fr/823ms36ms2ms3rd
https://www.louvre.fr/_next/static/chunks/framework-ca706bf673a13738.js820ms696ms14ms3rd
Unattributable714ms15ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W7NLG6X396ms336ms53ms3rd
https://www.louvre.fr/_next/static/chunks/7701.3557e561acf5fa96.js250ms33ms1ms3rd
https://www.louvre.fr/_next/static/chunks/pages/_app-f1b04bc0ee605759.js219ms108ms24ms3rd
https://www.louvre.fr/_next/static/chunks/main-a4a2b0af9b622db3.js83ms66ms12ms3rd
https://www.louvre.fr/_next/static/chunks/pages/index-693873238912ed06.js78ms72ms0ms3rd
https://tag.aticdn.net/piano-analytics.js75ms65ms9ms3rd
D
Page Weight Inventory
Action
74 resources · 3.7 MB · 168 KB savings available
FIX
74 resources · 3.7 MB · 168 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~168 KB of savings available
Warning::
73 third-party resources (100% of weight)
Info::
3 resources over 200KB
74 resources · 3.7 MiB · 73 third-party 2.7 MiB over 1MB target
Media 64% · 2.3 MiB
JavaScript 16% · 620.7 KiB
Document 10% · 360.6 KiB
Image 7% · 253.2 KiB
Font 2% · 76.5 KiB
CSS 1% · 44.9 KiB
Other 1% · 22.9 KiB

~168.3 KiB of savings available

Remove unused JavaScript: 168.3 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
JS Bundles
Action
35 scripts, 168 KB unused
REVIEW
35 scripts, 168 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W7N...: 62 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.louvre.fr/_next/static/chunks/pages/_a...: 60 KB unused (26%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.louvre.fr/_next/static/chunks/main-a4a...: 46 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 168 KB
168 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-W7NLG6X136 KB62 KB (46%)✓3rd
https://www.louvre.fr/_next/static/chunks/pages/_app-f1b04bc0ee605759.js231 KB60 KB (26%)✓3rd
https://www.louvre.fr/_next/static/chunks/main-a4a2b0af9b622db3.js113 KB46 KB (41%)✓3rd
https://www.louvre.fr/_next/static/chunks/2327.e29fcdb4ee801012.js11 KB—✓3rd
https://www.louvre.fr/_next/static/chunks/webpack-3005fd43d8ccab35.js10 KB—✓3rd
https://www.louvre.fr/_next/static/chunks/5874.e5c0605262aba80d.js1 KB—✓3rd
https://www.louvre.fr/_next/static/chunks/9487.eb8a6d2ddd07c23d.js5 KB—✓3rd
https://www.louvre.fr/_next/static/chunks/2947.c6def239d89ad179.js1 KB—✓3rd
https://www.louvre.fr/_next/static/chunks/1089.43e2e247625cdeeb.js3 KB—✓3rd
https://www.louvre.fr/_next/static/chunks/2196.2eddaa1d4eaa4a65.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

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
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Info::
All images are well-optimized
4 images 251 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
6 fonts (77 KB)
PASS
6 fonts (77 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

77 KB total

Render-blocking

0

of 6

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 8.0 s FCP 4.1 s LCP 8.4 shttps://www.louvre.fr/assets/fonts/roboto/300/latin.woff2latin.woff2 https://www.louvre.fr/assets/fonts/roboto/300/latin.woff2 — 11.5 KiB — 108 ms — font-display: swaphttps://www.louvre.fr/assets/fonts/roboto/400/latin.woff2latin.woff2 https://www.louvre.fr/assets/fonts/roboto/400/latin.woff2 — 11.3 KiB — 110 ms — font-display: swaphttps://www.louvre.fr/assets/fonts/roboto/500/latin.woff2latin.woff2 https://www.louvre.fr/assets/fonts/roboto/500/latin.woff2 — 11.4 KiB — 112 ms — font-display: swaphttps://www.louvre.fr/assets/fonts/roboto/700/latin.woff2latin.woff2 https://www.louvre.fr/assets/fonts/roboto/700/latin.woff2 — 11.3 KiB — 114 ms — font-display: swaphttps://www.louvre.fr/assets/fonts/montserrat/600/latin.woff2latin.woff2 https://www.louvre.fr/assets/fonts/montserrat/600/latin.woff2 — 13.7 KiB — 117 ms — font-display: swaphttps://www.louvre.fr/assets/fonts/louvreserif/400/latin.woff2latin.woff2 https://www.louvre.fr/assets/fonts/louvreserif/400/latin.woff2 — 17.4 KiB — 117 ms — font-display: swap
latin.woff2 woff2 swap
Size 11 KB
Load time 108 ms
Start 917 ms
Risk FOUT — text flashes from fallback to web font
latin.woff2 woff2 swap
Size 11 KB
Load time 110 ms
Start 917 ms
Risk FOUT — text flashes from fallback to web font
latin.woff2 woff2 swap
Size 11 KB
Load time 112 ms
Start 918 ms
Risk FOUT — text flashes from fallback to web font
latin.woff2 woff2 swap
Size 11 KB
Load time 114 ms
Start 918 ms
Risk FOUT — text flashes from fallback to web font
latin.woff2 woff2 swap
Size 14 KB
Load time 117 ms
Start 920 ms
Risk FOUT — text flashes from fallback to web font
latin.woff2 woff2 swap
Size 17 KB
Load time 117 ms
Start 921 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
26 hints, 0 missing preconnects
PASS
26 hints, 0 missing preconnects
Info::
Page uses 26 resource hint(s)

Current Resource Hints

preconnect
—
preload
+14
24
dns-prefetch
—
prefetch
2

26 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
74 requests over 2680ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 4.1 s LCP 8.4 shttps://louvre.fr// https://louvre.fr/ — 301 — 139 B — 531 ms — h2https://www.louvre.fr/www.louvre.fr/ https://www.louvre.fr/ — 200 — 360.5 KiB — 459 ms — h2https://www.louvre.fr/assets/fonts/roboto/300/latin.woff2www.louvre.fr/assets/fonts/roboto/3... https://www.louvre.fr/assets/fonts/roboto/300/latin.woff2 — 200 — 11.5 KiB — 108 ms — h2https://www.louvre.fr/assets/fonts/roboto/400/latin.woff2www.louvre.fr/assets/fonts/roboto/4... https://www.louvre.fr/assets/fonts/roboto/400/latin.woff2 — 200 — 11.3 KiB — 110 ms — h2https://www.louvre.fr/assets/fonts/roboto/500/latin.woff2www.louvre.fr/assets/fonts/roboto/5... https://www.louvre.fr/assets/fonts/roboto/500/latin.woff2 — 200 — 11.4 KiB — 112 ms — h2https://www.louvre.fr/assets/fonts/roboto/700/latin.woff2www.louvre.fr/assets/fonts/roboto/7... https://www.louvre.fr/assets/fonts/roboto/700/latin.woff2 — 200 — 11.3 KiB — 114 ms — h2https://www.louvre.fr/assets/fonts/montserrat/600/latin.woff2www.louvre.fr/assets/fonts/montserr... https://www.louvre.fr/assets/fonts/montserrat/600/latin.woff2 — 200 — 13.7 KiB — 117 ms — h2https://www.louvre.fr/assets/fonts/louvreserif/400/latin.woff2www.louvre.fr/assets/fonts/louvrese... https://www.louvre.fr/assets/fonts/louvreserif/400/latin.woff2 — 200 — 17.4 KiB — 117 ms — h2https://www.louvre.fr/_next/static/css/ad0e2886db868d76.csswww.louvre.fr/_next/static/css/ad0e... https://www.louvre.fr/_next/static/css/ad0e2886db868d76.css — 200 — 10.8 KiB — 85 ms — h2https://www.louvre.fr/_next/static/css/5e3fedc2ad55cb66.csswww.louvre.fr/_next/static/css/5e3f... https://www.louvre.fr/_next/static/css/5e3fedc2ad55cb66.css — 200 — 2.4 KiB — 70 ms — h2https://www.louvre.fr/_next/static/css/b814ad37a1cc7dff.csswww.louvre.fr/_next/static/css/b814... https://www.louvre.fr/_next/static/css/b814ad37a1cc7dff.css — 200 — 988 B — 65 ms — h2https://www.louvre.fr/_next/static/css/7ded3c444bec29bf.csswww.louvre.fr/_next/static/css/7ded... https://www.louvre.fr/_next/static/css/7ded3c444bec29bf.css — 200 — 879 B — 65 ms — h2https://www.louvre.fr/_next/static/css/52bbc941341cef65.csswww.louvre.fr/_next/static/css/52bb... https://www.louvre.fr/_next/static/css/52bbc941341cef65.css — 200 — 3.7 KiB — 66 ms — h2https://www.louvre.fr/_next/static/css/df74ed30e79c4432.csswww.louvre.fr/_next/static/css/df74... https://www.louvre.fr/_next/static/css/df74ed30e79c4432.css — 200 — 661 B — 67 ms — h2https://www.louvre.fr/_next/static/css/ef46db3751d8e999.csswww.louvre.fr/_next/static/css/ef46... https://www.louvre.fr/_next/static/css/ef46db3751d8e999.css — 200 — 504 B — 67 ms — h2https://www.louvre.fr/_next/static/css/f5bf39afbd276824.csswww.louvre.fr/_next/static/css/f5bf... https://www.louvre.fr/_next/static/css/f5bf39afbd276824.css — 200 — 4.0 KiB — 70 ms — h2https://www.louvre.fr/_next/static/css/4fd97a5ffa430c78.csswww.louvre.fr/_next/static/css/4fd9... https://www.louvre.fr/_next/static/css/4fd97a5ffa430c78.css — 200 — 1.4 KiB — 68 ms — h2https://www.louvre.fr/_next/static/css/4710dc6e437cf42f.csswww.louvre.fr/_next/static/css/4710... https://www.louvre.fr/_next/static/css/4710dc6e437cf42f.css — 200 — 631 B — 71 ms — h2https://www.louvre.fr/_next/static/css/cadf84532c67011e.csswww.louvre.fr/_next/static/css/cadf... https://www.louvre.fr/_next/static/css/cadf84532c67011e.css — 200 — 754 B — 73 ms — h2https://www.louvre.fr/_next/static/css/9b34b66fdb012949.csswww.louvre.fr/_next/static/css/9b34... https://www.louvre.fr/_next/static/css/9b34b66fdb012949.css — 200 — 854 B — 74 ms — h2https://www.louvre.fr/_next/static/css/114576d2e87ebbe2.csswww.louvre.fr/_next/static/css/1145... https://www.louvre.fr/_next/static/css/114576d2e87ebbe2.css — 200 — 2.7 KiB — 75 ms — h2https://www.louvre.fr/_next/static/css/61a9a806c321de38.csswww.louvre.fr/_next/static/css/61a9... https://www.louvre.fr/_next/static/css/61a9a806c321de38.css — 200 — 2.3 KiB — 76 ms — h2https://www.louvre.fr/_next/static/css/0cbbaf4ebcdd8a44.csswww.louvre.fr/_next/static/css/0cbb... https://www.louvre.fr/_next/static/css/0cbbaf4ebcdd8a44.css — 200 — 2.0 KiB — 77 ms — h2https://www.louvre.fr/_next/static/css/c01537527c3b1f7a.csswww.louvre.fr/_next/static/css/c015... https://www.louvre.fr/_next/static/css/c01537527c3b1f7a.css — 200 — 822 B — 78 ms — h2https://www.louvre.fr/_next/static/css/a82b59a08a6e4038.csswww.louvre.fr/_next/static/css/a82b... https://www.louvre.fr/_next/static/css/a82b59a08a6e4038.css — 200 — 6.2 KiB — 80 ms — h2https://www.louvre.fr/_next/static/css/c2d7e408039bb292.csswww.louvre.fr/_next/static/css/c2d7... https://www.louvre.fr/_next/static/css/c2d7e408039bb292.css — 200 — 2.3 KiB — 81 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w188_h188_c1/public/2021-01/cour-napoleon-et-pyramide_1.jpgapi-www.louvre.fr/sites/default/fil... https://api-www.louvre.fr/sites/default/files/styles/w188_h188_c1/public/2021-01/cour-napoleon-et-pyramide_1.jpg — 200 — 46.1 KiB — 1.2 s — h2https://www.louvre.fr/_next/static/chunks/5837.89513f9354073118.jswww.louvre.fr/_next/static/chunks/5... https://www.louvre.fr/_next/static/chunks/5837.89513f9354073118.js — 200 — 897 B — 98 ms — h2https://www.louvre.fr/_next/static/chunks/4039.c872651f21daeeb8.jswww.louvre.fr/_next/static/chunks/4... https://www.louvre.fr/_next/static/chunks/4039.c872651f21daeeb8.js — 200 — 1.0 KiB — 98 ms — h2https://www.louvre.fr/_next/static/chunks/2062.b7059f349394f400.jswww.louvre.fr/_next/static/chunks/2... https://www.louvre.fr/_next/static/chunks/2062.b7059f349394f400.js — 200 — 4.9 KiB — 100 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 4.1 s LCP 8.4 shttps://louvre.fr// https://louvre.fr/ — 301 — 139 B — 531 ms — h2https://www.louvre.fr/www.louvre.fr/ https://www.louvre.fr/ — 200 — 360.5 KiB — 459 ms — h2https://www.louvre.fr/assets/fonts/roboto/300/latin.woff2www.louvre.fr/assets/fonts/roboto/3... https://www.louvre.fr/assets/fonts/roboto/300/latin.woff2 — 200 — 11.5 KiB — 108 ms — h2https://www.louvre.fr/assets/fonts/roboto/400/latin.woff2www.louvre.fr/assets/fonts/roboto/4... https://www.louvre.fr/assets/fonts/roboto/400/latin.woff2 — 200 — 11.3 KiB — 110 ms — h2https://www.louvre.fr/assets/fonts/roboto/500/latin.woff2www.louvre.fr/assets/fonts/roboto/5... https://www.louvre.fr/assets/fonts/roboto/500/latin.woff2 — 200 — 11.4 KiB — 112 ms — h2https://www.louvre.fr/assets/fonts/roboto/700/latin.woff2www.louvre.fr/assets/fonts/roboto/7... https://www.louvre.fr/assets/fonts/roboto/700/latin.woff2 — 200 — 11.3 KiB — 114 ms — h2https://www.louvre.fr/assets/fonts/montserrat/600/latin.woff2www.louvre.fr/assets/fonts/montserr... https://www.louvre.fr/assets/fonts/montserrat/600/latin.woff2 — 200 — 13.7 KiB — 117 ms — h2https://www.louvre.fr/assets/fonts/louvreserif/400/latin.woff2www.louvre.fr/assets/fonts/louvrese... https://www.louvre.fr/assets/fonts/louvreserif/400/latin.woff2 — 200 — 17.4 KiB — 117 ms — h2https://www.louvre.fr/_next/static/css/ad0e2886db868d76.csswww.louvre.fr/_next/static/css/ad0e... https://www.louvre.fr/_next/static/css/ad0e2886db868d76.css — 200 — 10.8 KiB — 85 ms — h2https://www.louvre.fr/_next/static/css/5e3fedc2ad55cb66.csswww.louvre.fr/_next/static/css/5e3f... https://www.louvre.fr/_next/static/css/5e3fedc2ad55cb66.css — 200 — 2.4 KiB — 70 ms — h2https://www.louvre.fr/_next/static/css/b814ad37a1cc7dff.csswww.louvre.fr/_next/static/css/b814... https://www.louvre.fr/_next/static/css/b814ad37a1cc7dff.css — 200 — 988 B — 65 ms — h2https://www.louvre.fr/_next/static/css/7ded3c444bec29bf.csswww.louvre.fr/_next/static/css/7ded... https://www.louvre.fr/_next/static/css/7ded3c444bec29bf.css — 200 — 879 B — 65 ms — h2https://www.louvre.fr/_next/static/css/52bbc941341cef65.csswww.louvre.fr/_next/static/css/52bb... https://www.louvre.fr/_next/static/css/52bbc941341cef65.css — 200 — 3.7 KiB — 66 ms — h2https://www.louvre.fr/_next/static/css/df74ed30e79c4432.csswww.louvre.fr/_next/static/css/df74... https://www.louvre.fr/_next/static/css/df74ed30e79c4432.css — 200 — 661 B — 67 ms — h2https://www.louvre.fr/_next/static/css/ef46db3751d8e999.csswww.louvre.fr/_next/static/css/ef46... https://www.louvre.fr/_next/static/css/ef46db3751d8e999.css — 200 — 504 B — 67 ms — h2https://www.louvre.fr/_next/static/css/f5bf39afbd276824.csswww.louvre.fr/_next/static/css/f5bf... https://www.louvre.fr/_next/static/css/f5bf39afbd276824.css — 200 — 4.0 KiB — 70 ms — h2https://www.louvre.fr/_next/static/css/4fd97a5ffa430c78.csswww.louvre.fr/_next/static/css/4fd9... https://www.louvre.fr/_next/static/css/4fd97a5ffa430c78.css — 200 — 1.4 KiB — 68 ms — h2https://www.louvre.fr/_next/static/css/4710dc6e437cf42f.csswww.louvre.fr/_next/static/css/4710... https://www.louvre.fr/_next/static/css/4710dc6e437cf42f.css — 200 — 631 B — 71 ms — h2https://www.louvre.fr/_next/static/css/cadf84532c67011e.csswww.louvre.fr/_next/static/css/cadf... https://www.louvre.fr/_next/static/css/cadf84532c67011e.css — 200 — 754 B — 73 ms — h2https://www.louvre.fr/_next/static/css/9b34b66fdb012949.csswww.louvre.fr/_next/static/css/9b34... https://www.louvre.fr/_next/static/css/9b34b66fdb012949.css — 200 — 854 B — 74 ms — h2https://www.louvre.fr/_next/static/css/114576d2e87ebbe2.csswww.louvre.fr/_next/static/css/1145... https://www.louvre.fr/_next/static/css/114576d2e87ebbe2.css — 200 — 2.7 KiB — 75 ms — h2https://www.louvre.fr/_next/static/css/61a9a806c321de38.csswww.louvre.fr/_next/static/css/61a9... https://www.louvre.fr/_next/static/css/61a9a806c321de38.css — 200 — 2.3 KiB — 76 ms — h2https://www.louvre.fr/_next/static/css/0cbbaf4ebcdd8a44.csswww.louvre.fr/_next/static/css/0cbb... https://www.louvre.fr/_next/static/css/0cbbaf4ebcdd8a44.css — 200 — 2.0 KiB — 77 ms — h2https://www.louvre.fr/_next/static/css/c01537527c3b1f7a.csswww.louvre.fr/_next/static/css/c015... https://www.louvre.fr/_next/static/css/c01537527c3b1f7a.css — 200 — 822 B — 78 ms — h2https://www.louvre.fr/_next/static/css/a82b59a08a6e4038.csswww.louvre.fr/_next/static/css/a82b... https://www.louvre.fr/_next/static/css/a82b59a08a6e4038.css — 200 — 6.2 KiB — 80 ms — h2https://www.louvre.fr/_next/static/css/c2d7e408039bb292.csswww.louvre.fr/_next/static/css/c2d7... https://www.louvre.fr/_next/static/css/c2d7e408039bb292.css — 200 — 2.3 KiB — 81 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w188_h188_c1/public/2021-01/cour-napoleon-et-pyramide_1.jpgapi-www.louvre.fr/sites/default/fil... https://api-www.louvre.fr/sites/default/files/styles/w188_h188_c1/public/2021-01/cour-napoleon-et-pyramide_1.jpg — 200 — 46.1 KiB — 1.2 s — h2https://www.louvre.fr/_next/static/chunks/5837.89513f9354073118.jswww.louvre.fr/_next/static/chunks/5... https://www.louvre.fr/_next/static/chunks/5837.89513f9354073118.js — 200 — 897 B — 98 ms — h2https://www.louvre.fr/_next/static/chunks/4039.c872651f21daeeb8.jswww.louvre.fr/_next/static/chunks/4... https://www.louvre.fr/_next/static/chunks/4039.c872651f21daeeb8.js — 200 — 1.0 KiB — 98 ms — h2https://www.louvre.fr/_next/static/chunks/2062.b7059f349394f400.jswww.louvre.fr/_next/static/chunks/2... https://www.louvre.fr/_next/static/chunks/2062.b7059f349394f400.js — 200 — 4.9 KiB — 100 ms — h2https://www.louvre.fr/_next/static/chunks/1632.0e2b6fb0508023fd.jswww.louvre.fr/_next/static/chunks/1... https://www.louvre.fr/_next/static/chunks/1632.0e2b6fb0508023fd.js — 200 — 2.7 KiB — 102 ms — h2https://www.louvre.fr/_next/static/chunks/8438.ced171d6fdc710b8.jswww.louvre.fr/_next/static/chunks/8... https://www.louvre.fr/_next/static/chunks/8438.ced171d6fdc710b8.js — 200 — 1.4 KiB — 103 ms — h2https://www.louvre.fr/_next/static/chunks/5874.e5c0605262aba80d.jswww.louvre.fr/_next/static/chunks/5... https://www.louvre.fr/_next/static/chunks/5874.e5c0605262aba80d.js — 200 — 1.4 KiB — 107 ms — h2https://www.louvre.fr/_next/static/chunks/9487.eb8a6d2ddd07c23d.jswww.louvre.fr/_next/static/chunks/9... https://www.louvre.fr/_next/static/chunks/9487.eb8a6d2ddd07c23d.js — 200 — 5.2 KiB — 104 ms — h2https://www.louvre.fr/_next/static/chunks/2947.c6def239d89ad179.jswww.louvre.fr/_next/static/chunks/2... https://www.louvre.fr/_next/static/chunks/2947.c6def239d89ad179.js — 200 — 1004 B — 103 ms — h2https://www.louvre.fr/_next/static/chunks/1089.43e2e247625cdeeb.jswww.louvre.fr/_next/static/chunks/1... https://www.louvre.fr/_next/static/chunks/1089.43e2e247625cdeeb.js — 200 — 2.9 KiB — 105 ms — h2https://www.louvre.fr/_next/static/chunks/2196.2eddaa1d4eaa4a65.jswww.louvre.fr/_next/static/chunks/2... https://www.louvre.fr/_next/static/chunks/2196.2eddaa1d4eaa4a65.js — 200 — 2.6 KiB — 107 ms — h2https://www.louvre.fr/_next/static/chunks/4536.cca4fd6aa9a66abe.jswww.louvre.fr/_next/static/chunks/4... https://www.louvre.fr/_next/static/chunks/4536.cca4fd6aa9a66abe.js — 200 — 845 B — 108 ms — h2https://www.louvre.fr/_next/static/chunks/5297.3d217ef6a2bfba4a.jswww.louvre.fr/_next/static/chunks/5... https://www.louvre.fr/_next/static/chunks/5297.3d217ef6a2bfba4a.js — 200 — 999 B — 110 ms — h2https://www.louvre.fr/_next/static/chunks/752.105ee7dcc276a745.jswww.louvre.fr/_next/static/chunks/7... https://www.louvre.fr/_next/static/chunks/752.105ee7dcc276a745.js — 200 — 889 B — 111 ms — h2https://www.louvre.fr/_next/static/chunks/64.2c6ef827de328f45.jswww.louvre.fr/_next/static/chunks/6... https://www.louvre.fr/_next/static/chunks/64.2c6ef827de328f45.js — 200 — 1.5 KiB — 116 ms — h2https://www.louvre.fr/_next/static/chunks/2257.e3cf828fcc9ea695.jswww.louvre.fr/_next/static/chunks/2... https://www.louvre.fr/_next/static/chunks/2257.e3cf828fcc9ea695.js — 200 — 1.5 KiB — 113 ms — h2https://www.louvre.fr/_next/static/chunks/3124.e5d9b996ad665fc2.jswww.louvre.fr/_next/static/chunks/3... https://www.louvre.fr/_next/static/chunks/3124.e5d9b996ad665fc2.js — 200 — 1.6 KiB — 117 ms — h2https://www.louvre.fr/_next/static/chunks/2327.e29fcdb4ee801012.jswww.louvre.fr/_next/static/chunks/2... https://www.louvre.fr/_next/static/chunks/2327.e29fcdb4ee801012.js — 200 — 11.1 KiB — 119 ms — h2https://www.louvre.fr/_next/static/chunks/9712.3337c714fff947cc.jswww.louvre.fr/_next/static/chunks/9... https://www.louvre.fr/_next/static/chunks/9712.3337c714fff947cc.js — 200 — 1.8 KiB — 121 ms — h2https://www.louvre.fr/_next/static/chunks/9217.b7ec940bd89ced3c.jswww.louvre.fr/_next/static/chunks/9... https://www.louvre.fr/_next/static/chunks/9217.b7ec940bd89ced3c.js — 200 — 987 B — 122 ms — h2https://www.louvre.fr/_next/static/chunks/4036.e520fc89540bd90d.jswww.louvre.fr/_next/static/chunks/4... https://www.louvre.fr/_next/static/chunks/4036.e520fc89540bd90d.js — 200 — 1.5 KiB — 124 ms — h2https://www.louvre.fr/_next/static/chunks/webpack-3005fd43d8ccab35.jswww.louvre.fr/_next/static/chunks/w... https://www.louvre.fr/_next/static/chunks/webpack-3005fd43d8ccab35.js — 200 — 10.4 KiB — 126 ms — h2https://www.louvre.fr/_next/static/chunks/framework-ca706bf673a13738.jswww.louvre.fr/_next/static/chunks/f... https://www.louvre.fr/_next/static/chunks/framework-ca706bf673a13738.js — 200 — 45.0 KiB — 136 ms — h2https://www.louvre.fr/_next/static/chunks/main-a4a2b0af9b622db3.jswww.louvre.fr/_next/static/chunks/m... https://www.louvre.fr/_next/static/chunks/main-a4a2b0af9b622db3.js — 200 — 113.3 KiB — 137 ms — h2https://www.louvre.fr/_next/static/chunks/pages/_app-f1b04bc0ee605759.jswww.louvre.fr/_next/static/chunks/p... https://www.louvre.fr/_next/static/chunks/pages/_app-f1b04bc0ee605759.js — 200 — 231.4 KiB — 147 ms — h2https://www.louvre.fr/_next/static/chunks/pages/index-693873238912ed06.jswww.louvre.fr/_next/static/chunks/p... https://www.louvre.fr/_next/static/chunks/pages/index-693873238912ed06.js — 200 — 1.8 KiB — 140 ms — h2https://www.louvre.fr/_next/static/KMV0oPhb_PYJkw1AvfBcc/_buildManifest.jswww.louvre.fr/_next/static/KMV0oPhb... https://www.louvre.fr/_next/static/KMV0oPhb_PYJkw1AvfBcc/_buildManifest.js — 200 — 881 B — 140 ms — h2https://www.louvre.fr/_next/static/KMV0oPhb_PYJkw1AvfBcc/_ssgManifest.jswww.louvre.fr/_next/static/KMV0oPhb... https://www.louvre.fr/_next/static/KMV0oPhb_PYJkw1AvfBcc/_ssgManifest.js — 200 — 614 B — 144 ms — h2https://www.louvre.fr/assets/favicon/site.webmanifestwww.louvre.fr/assets/favicon/site.w... https://www.louvre.fr/assets/favicon/site.webmanifest — 200 — 745 B — 91 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w686_h686_c1/public/2021-03/michelangelo-buonarroti-dit-michel-ange-captif-dit-l-esclave-mourant-haut-du-corps-profil-droit.jpgapi-www.louvre.fr/sites/default/fil... https://api-www.louvre.fr/sites/default/files/styles/w686_h686_c1/public/2021-03/michelangelo-buonarroti-dit-michel-ange-captif-dit-l-esclave-mourant-haut-du-corps-profil-droit.jpg — 200 — 25.7 KiB — 818 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w686_h686_c1/public/2025-12/WEB_IVR44_20256800786NUCA-crop.jpgapi-www.louvre.fr/sites/default/fil... https://api-www.louvre.fr/sites/default/files/styles/w686_h686_c1/public/2025-12/WEB_IVR44_20256800786NUCA-crop.jpg — 200 — 136.4 KiB — 1.1 s — h2https://api-www.louvre.fr/sites/default/files/styles/w686_h686_c1/public/2026-01/photogramme-du-film-beau-travail-de-claire-denis.jpgapi-www.louvre.fr/sites/default/fil... https://api-www.louvre.fr/sites/default/files/styles/w686_h686_c1/public/2026-01/photogramme-du-film-beau-travail-de-claire-denis.jpg — 200 — 43.0 KiB — 970 ms — h2https://www.louvre.fr/_next/static/chunks/7126.0c4f5f66231300bb.jswww.louvre.fr/_next/static/chunks/7... https://www.louvre.fr/_next/static/chunks/7126.0c4f5f66231300bb.js — 200 — 829 B — 21 ms — h2https://www.louvre.fr/_next/static/chunks/5247.b63c882834bdcd7e.jswww.louvre.fr/_next/static/chunks/5... https://www.louvre.fr/_next/static/chunks/5247.b63c882834bdcd7e.js — 200 — 939 B — 22 ms — h2https://www.louvre.fr/_next/static/chunks/1426.542a7d50f05859f5.jswww.louvre.fr/_next/static/chunks/1... https://www.louvre.fr/_next/static/chunks/1426.542a7d50f05859f5.js — 200 — 909 B — 23 ms — h2https://www.louvre.fr/_next/static/css/56048135c560d4ad.csswww.louvre.fr/_next/static/css/5604... https://www.louvre.fr/_next/static/css/56048135c560d4ad.css — 200 — 1.1 KiB — 22 ms — h2https://www.louvre.fr/_next/static/chunks/5048.fc33d7097a1168ab.jswww.louvre.fr/_next/static/chunks/5... https://www.louvre.fr/_next/static/chunks/5048.fc33d7097a1168ab.js — 200 — 2.8 KiB — 24 ms — h2https://www.louvre.fr/_next/static/chunks/2756.598ebdab07edfc31.jswww.louvre.fr/_next/static/chunks/2... https://www.louvre.fr/_next/static/chunks/2756.598ebdab07edfc31.js — 200 — 1.0 KiB — 21 ms — h2https://www.louvre.fr/_next/static/chunks/7701.3557e561acf5fa96.jswww.louvre.fr/_next/static/chunks/7... https://www.louvre.fr/_next/static/chunks/7701.3557e561acf5fa96.js — 200 — 1.3 KiB — 21 ms — h2https://www.louvre.fr/null.mp4www.louvre.fr/null.mp4 https://www.louvre.fr/null.mp4 — -1 — 0 B — 12 ms — https://api-www.louvre.fr/api/page/gestion-et-politique-des-cookiesapi-www.louvre.fr/api/page/gestion-... https://api-www.louvre.fr/api/page/gestion-et-politique-des-cookies — 200 — 6.7 KiB — 59 ms — h2https://api-www.louvre.fr/api/pageapi-www.louvre.fr/api/page https://api-www.louvre.fr/api/page — 200 — 8.6 KiB — 73 ms — h2https://api-www.louvre.fr/sites/default/files/2024-04/cover-w768-h768-scaled.mp4api-www.louvre.fr/sites/default/fil... https://api-www.louvre.fr/sites/default/files/2024-04/cover-w768-h768-scaled.mp4 — 206 — 2.3 MiB — 125 ms — h2https://api-www.louvre.fr/api/page/visiterapi-www.louvre.fr/api/page/visiter https://api-www.louvre.fr/api/page/visiter — 200 — 6.5 KiB — 23 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-W7NLG6Xwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-W7NLG6X — 200 — 135.5 KiB — 156 ms — h2https://www.louvre.fr/assets/favicon/favicon.svgwww.louvre.fr/assets/favicon/favico... https://www.louvre.fr/assets/favicon/favicon.svg — 200 — 2.0 KiB — 21 ms — h2https://tag.aticdn.net/piano-analytics.jstag.aticdn.net/piano-analytics.js https://tag.aticdn.net/piano-analytics.js — 200 — 27.7 KiB — 23 ms — h2https://fxxslpn.pa-cd.com/event?s=641239&idclient=mo94hvattg4lif6yfxxslpn.pa-cd.com/event?s=641239&id... https://fxxslpn.pa-cd.com/event?s=641239&idclient=mo94hvattg4lif6y — 204 — 327 B — 95 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 3457ms · 916KB · €38/mo
www.louvre.fr
Other
Costly
Execution 823ms
Transfer 360 KB
Monthly Cost €9/mo
www.louvre.fr
Other
Costly
Execution 820ms
Transfer 45 KB
Monthly Cost €9/mo
Unattributable
Other
Costly
Execution 714ms
Transfer 0 KB
Monthly Cost €8/mo
Google Tag Manager
Tag Manager
Costly
Execution 396ms
Transfer 136 KB
Unused 46%
Monthly Cost €4/mo
www.louvre.fr
Other
Costly
Execution 250ms
Transfer 1 KB
Monthly Cost €3/mo
www.louvre.fr
Other
Costly
Execution 219ms
Transfer 231 KB
Unused 26%
Monthly Cost €2/mo
www.louvre.fr
Other
Optional
Execution 83ms
Transfer 113 KB
Unused 41%
Monthly Cost €1/mo
www.louvre.fr
Other
Optional
Execution 78ms
Transfer 2 KB
Monthly Cost €1/mo
tag.aticdn.net
Other
Optional
Execution 75ms
Transfer 28 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.louvre.fr adds 823ms and costs ~€9/month
  • www.louvre.fr adds 820ms and costs ~€9/month
  • Unattributable adds 714ms and costs ~€8/month
  • Google Tag Manager adds 396ms and costs ~€4/month
  • www.louvre.fr adds 250ms and costs ~€3/month
  • www.louvre.fr adds 219ms and costs ~€2/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.louvre.fr takes 823ms 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.louvre.fr takes 820ms 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 714ms 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 396ms 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.louvre.fr takes 250ms 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.louvre.fr takes 219ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback