Skip to content
https://louvre.fr

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
83
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.26 s

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

2.26 s

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

36 ms

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

0.001

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

1.79 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.36 s

Page Load Progression

478 ms
956 ms
1.4 s
1.9 s
2.4 s
2.9 s
3.3 s
3.8 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
4.9 MB transferred, 76 requests
FIX
4.9 MB transferred, 76 requests
Critical::
Page weighs 5.4 MB (4.9 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::
76 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
4.9 MB / 2.4 MB budget
4.9 MB transferred
76 requests
1.0 g CO2 per page load
Other 3.6 MiB 73%
JavaScript 620.7 KiB 12%
HTML 360.5 KiB 7%
Images 253.6 KiB 5%
Fonts 76.5 KiB 2%
CSS 44.9 KiB 1%
Other 17.5 KiB 0%
Other 745 B 0%
Other 325 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 (4.9 MiB of 4.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
76 resources · 4.9 MB · 163 KB savings available
FIX
76 resources · 4.9 MB · 163 KB savings available
Warning::
Page weight 3.9 MB over 1MB target
Got: 4.9 MB Expected: ≤ 1 MB
Info::
~163 KB of savings available
Warning::
75 third-party resources (100% of weight)
Info::
3 resources over 200KB
76 resources · 4.9 MiB · 75 third-party 3.9 MiB over 1MB target
Media 73% · 3.6 MiB
JavaScript 12% · 620.7 KiB
Document 7% · 360.6 KiB
Image 5% · 255.6 KiB
Font 2% · 76.5 KiB
CSS 1% · 44.9 KiB
Other 0% · 16.3 KiB

~163.3 KiB of savings available

Remove unused JavaScript: 163.3 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.

B
JS Execution Cost
769ms total JS execution
REVIEW
769ms total JS execution
Info::
https://www.louvre.fr/_next/static/chunks/framewor...: 241ms CPU time
Info::
Unattributable: 188ms CPU time
Info::
https://www.louvre.fr/: 174ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-W7N...: 107ms CPU time
Info::
https://www.louvre.fr/_next/static/chunks/pages/_a...: 59ms CPU time
Warning::
Third-party scripts: 769ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 30% Style & Layout 13% Script Parsing & Compilation 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.louvre.fr/_next/static/chunks/framework-ca706bf673a13738.js241ms199ms5ms3rd
Unattributable188ms4ms0ms3rd
https://www.louvre.fr/174ms6ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W7NLG6X107ms90ms13ms3rd
https://www.louvre.fr/_next/static/chunks/pages/_app-f1b04bc0ee605759.js59ms28ms6ms3rd
C
JS Bundles
Action
35 scripts, 163 KB unused
REVIEW
35 scripts, 163 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...: 55 KB unused (24%)
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: 163 KB
163 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 KB55 KB (24%)✓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
7 images, 0 KB saveable
PASS
7 images, 0 KB saveable
Info::
All images are well-optimized
7 images 254 KB
0 oversized -0 KB
1 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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.3 shttps://www.louvre.fr/assets/fonts/roboto/300/latin.woff2latin.woff2 https://www.louvre.fr/assets/fonts/roboto/300/latin.woff2 — 11.5 KiB — 56 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 — 88 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 — 89 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 — 92 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 — 96 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 — 91 ms — font-display: swap
latin.woff2 woff2 swap
Size 11 KB
Load time 56 ms
Start 657 ms
Risk FOUT — text flashes from fallback to web font
latin.woff2 woff2 swap
Size 11 KB
Load time 88 ms
Start 658 ms
Risk FOUT — text flashes from fallback to web font
latin.woff2 woff2 swap
Size 11 KB
Load time 89 ms
Start 659 ms
Risk FOUT — text flashes from fallback to web font
latin.woff2 woff2 swap
Size 11 KB
Load time 92 ms
Start 659 ms
Risk FOUT — text flashes from fallback to web font
latin.woff2 woff2 swap
Size 14 KB
Load time 96 ms
Start 659 ms
Risk FOUT — text flashes from fallback to web font
latin.woff2 woff2 swap
Size 17 KB
Load time 91 ms
Start 663 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
76 requests over 1868ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.3 shttps://louvre.fr// https://louvre.fr/ — 301 — 139 B — 547 ms — h2https://www.louvre.fr/www.louvre.fr/ https://www.louvre.fr/ — 200 — 360.5 KiB — 191 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 — 56 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 — 88 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 — 89 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 — 92 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 — 96 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 — 91 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 — 54 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 — 54 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 — 55 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 — 56 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 — 58 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 — 59 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 — 60 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 — 61 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 — 62 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 — 63 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 — 65 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 — 66 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 — 67 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 — 68 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 — 69 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 — 71 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 — 74 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 — 75 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w342_h107_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/w342_h107_c1/public/2021-01/cour-napoleon-et-pyramide_1.jpg — 200 — 48.5 KiB — 554 ms — 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 — 63 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 — 61 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 — 62 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.3 shttps://louvre.fr// https://louvre.fr/ — 301 — 139 B — 547 ms — h2https://www.louvre.fr/www.louvre.fr/ https://www.louvre.fr/ — 200 — 360.5 KiB — 191 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 — 56 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 — 88 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 — 89 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 — 92 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 — 96 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 — 91 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 — 54 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 — 54 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 — 55 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 — 56 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 — 58 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 — 59 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 — 60 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 — 61 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 — 62 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 — 63 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 — 65 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 — 66 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 — 67 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 — 68 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 — 69 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 — 71 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 — 74 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 — 75 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w342_h107_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/w342_h107_c1/public/2021-01/cour-napoleon-et-pyramide_1.jpg — 200 — 48.5 KiB — 554 ms — 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 — 63 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 — 61 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 — 62 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 — 66 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 — 70 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 — 74 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 — 72 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 — 75 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 — 77 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 — 115 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 — 117 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 — 118 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 — 78 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 — 79 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 — 81 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 — 82 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 — 85 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 — 88 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 — 90 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 — 92 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 — 94 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 — 105 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 — 105 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 — 121 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 — 102 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 — 107 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 — 108 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 — 67 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w796_h796_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/w796_h796_c1/public/2021-03/michelangelo-buonarroti-dit-michel-ange-captif-dit-l-esclave-mourant-haut-du-corps-profil-droit.jpg — 200 — 31.7 KiB — 307 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w386_h386_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/w386_h386_c1/public/2026-01/photogramme-du-film-beau-travail-de-claire-denis.jpg — 200 — 19.9 KiB — 309 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w386_h386_c1/public/2022-06/famille-studio-du-louvre-le-forum.jpgapi-www.louvre.fr/sites/default/fil... https://api-www.louvre.fr/sites/default/files/styles/w386_h386_c1/public/2022-06/famille-studio-du-louvre-le-forum.jpg — 200 — 22.0 KiB — 303 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w386_h386_c1/public/2025-12/WEB_IVR44_20256800786NUCA-crop.jpgapi-www.louvre.fr/sites/default/fil... https://api-www.louvre.fr/sites/default/files/styles/w386_h386_c1/public/2025-12/WEB_IVR44_20256800786NUCA-crop.jpg — 200 — 51.4 KiB — 298 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w386_h386_c1/public/2026-01/visuel%2019.jpgapi-www.louvre.fr/sites/default/fil... https://api-www.louvre.fr/sites/default/files/styles/w386_h386_c1/public/2026-01/visuel%2019.jpg — 200 — 55.6 KiB — 312 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 — 24 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 — 26 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 — 21 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 — 29 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 — 20 ms — h2https://api-www.louvre.fr/sites/default/files/styles/w694_h208_c1/public/2021-02/henri-horace-roland-delaporte-la-petite-collation-ou-carafe-d-orgeat.jpgapi-www.louvre.fr/sites/default/fil... https://api-www.louvre.fr/sites/default/files/styles/w694_h208_c1/public/2021-02/henri-horace-roland-delaporte-la-petite-collation-ou-carafe-d-orgeat.jpg — 200 — 24.5 KiB — 32 ms — h2https://www.louvre.fr/null.mp4www.louvre.fr/null.mp4 https://www.louvre.fr/null.mp4 — -1 — 0 B — 30 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 — 103 ms — h2https://api-www.louvre.fr/api/pageapi-www.louvre.fr/api/page https://api-www.louvre.fr/api/page — 200 — 8.6 KiB — 88 ms — h2https://api-www.louvre.fr/sites/default/files/2024-04/cover-w1920-h600-scaled.mp4api-www.louvre.fr/sites/default/fil... https://api-www.louvre.fr/sites/default/files/2024-04/cover-w1920-h600-scaled.mp4 — 206 — 3.6 MiB — 21 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 — 86 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 — 154 ms — h2https://tag.aticdn.net/piano-analytics.jstag.aticdn.net/piano-analytics.js https://tag.aticdn.net/piano-analytics.js — 200 — 27.7 KiB — 20 ms — h2https://fxxslpn.pa-cd.com/event?s=641239&idclient=mo94i9e1ze0zh5i6fxxslpn.pa-cd.com/event?s=641239&id... https://fxxslpn.pa-cd.com/event?s=641239&idclient=mo94i9e1ze0zh5i6 — 204 — 325 B — 102 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 769ms · 772KB · €8/mo
www.louvre.fr
Other
Costly
Execution 241ms
Transfer 45 KB
Monthly Cost €3/mo
Unattributable
Other
Optional
Execution 188ms
Transfer 0 KB
Monthly Cost €2/mo
www.louvre.fr
Other
Optional
Execution 174ms
Transfer 360 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 107ms
Transfer 136 KB
Unused 46%
Monthly Cost €1/mo
www.louvre.fr
Other
Optional
Execution 59ms
Transfer 231 KB
Unused 24%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.louvre.fr adds 241ms 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.louvre.fr takes 241ms 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