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https://insee.fr

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
34
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

8.06 s

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

13.54 s

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

1.10 s

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.

8.06 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.

13.62 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
7 PASS 2 REVIEW 6 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 48 requests
FIX
2.2 MB transferred, 48 requests
Info::
Page weighs 4.6 MB (2.2 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
Fonts are 216 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 216 KB
Info::
48 HTTP requests
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
48 requests
0.46 g CO2 per page load
JavaScript 1.3 MiB 61%
Images 386.4 KiB 17%
Fonts 215.9 KiB 10%
Other 141.3 KiB 6%
CSS 92.8 KiB 4%
HTML 17.6 KiB 1%
Other 15.5 KiB 1%
Other 144 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2525ms total JS execution
FIX
2525ms total JS execution
Warning::
https://www.insee.fr/static/build/highcharts-insee...: 919ms CPU time
Warning::
https://www.insee.fr/static/js/application-lib.min...: 816ms CPU time
Warning::
Unattributable: 330ms CPU time
Info::
https://www.insee.fr/static/build/highcharts.js: 247ms CPU time
Info::
https://www.insee.fr/fr/accueil: 151ms CPU time
Warning::
Third-party scripts: 2525ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Other 13% Script Parsing & Compilation 13% Style & Layout 12% Parse HTML & CSS 4% Garbage Collection 4%
ScriptTotalScriptingParse/CompileParty
https://www.insee.fr/static/build/highcharts-insee.js919ms742ms124ms3rd
https://www.insee.fr/static/js/application-lib.min.js816ms364ms116ms3rd
Unattributable330ms12ms0ms3rd
https://www.insee.fr/static/build/highcharts.js247ms183ms54ms3rd
https://www.insee.fr/fr/accueil151ms7ms5ms3rd
https://cdn.matomo.cloud/insee.matomo.cloud/container_j86K86K5.js63ms49ms14ms3rd
F
JS Bundles
Action
7 scripts, 968 KB unused
FIX
7 scripts, 968 KB unused
Warning::
https://www.insee.fr/static/build/highcharts-insee...: 376 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.insee.fr/static/build/highcharts.js: 271 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.insee.fr/static/js/application-lib.min...: 193 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.insee.fr/static/build/application.js: 101 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.matomo.cloud/insee.matomo.cloud/contai...: 27 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 968 KB
968 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.insee.fr/static/build/highcharts-insee.js586 KB376 KB (65%)✓3rd
https://www.insee.fr/static/build/highcharts.js322 KB271 KB (84%)✓3rd
https://www.insee.fr/static/js/application-lib.min.js259 KB193 KB (75%)✓3rd
https://www.insee.fr/static/build/application.js117 KB101 KB (87%)✓3rd
https://cdn.matomo.cloud/insee.matomo.cloud/container_j86K86K5.js50 KB27 KB (54%)✓3rd
https://www.insee.fr/static/js/svg/graphsvg.js10 KB—✗3rd
https://www.insee.fr/static/build/htmx.min.js21 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
48 resources · 2.2 MB · 968 KB savings available
FIX
48 resources · 2.2 MB · 968 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~968 KB of savings available
Warning::
47 third-party resources (100% of weight)
Info::
3 resources over 200KB
48 resources · 2.2 MiB · 47 third-party 1.2 MiB over 1MB target
JavaScript 61% · 1.3 MiB
Image 18% · 401.3 KiB
Font 10% · 215.9 KiB
Other 5% · 108.2 KiB
CSS 4% · 92.8 KiB
Document 2% · 51.3 KiB

~968.1 KiB of savings available

Remove unused JavaScript: 968.1 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
Image Optimization
Action
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://www.insee.fr/static/img/a-la-une/collectio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.insee.fr/static/img/a-la-une/conjonctu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.insee.fr/fr/statistiques/vignette/8967... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.insee.fr/static/img/pictooreille.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.insee.fr/static/img/logoInseeFr.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 386 KB
0 oversized -0 KB
17 legacy format
5 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

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

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

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

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
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+
Font Loading
5 fonts (216 KB)
PASS
5 fonts (216 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

216 KB total

Render-blocking

0

of 5

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 FCP 8.1 s LCP 13.5 shttps://www.insee.fr/static/fonts/Open-Sans-regular/Open-Sans-regular.woff2Open-Sans-regular.woff2 https://www.insee.fr/static/fonts/Open-Sans-regular/Open-Sans-regular.woff2 — 10.3 KiB — 26 ms — font-display: swaphttps://www.insee.fr/static/fonts/Open-Sans-700/Open-Sans-700.woff2Open-Sans-700.woff2 https://www.insee.fr/static/fonts/Open-Sans-700/Open-Sans-700.woff2 — 10.2 KiB — 46 ms — font-display: swaphttps://www.insee.fr/static/fonts/INSEE_icoFont.woff?7o844oINSEE_icoFont.woff https://www.insee.fr/static/fonts/INSEE_icoFont.woff?7o844o — 22.6 KiB — 62 ms — font-display: swaphttps://www.insee.fr/static/fonts/Open-Sans-600/Open-Sans-600.woff2Open-Sans-600.woff2 https://www.insee.fr/static/fonts/Open-Sans-600/Open-Sans-600.woff2 — 10.3 KiB — 49 ms — font-display: swaphttps://www.insee.fr/static/fonts/RemixIcon/remixicon.woff2?t=1718271040674remixicon.woff2 https://www.insee.fr/static/fonts/RemixIcon/remixicon.woff2?t=1718271040674 — 162.5 KiB — 99 ms — font-display: swap
Open-Sans-regular.woff2 woff2 swap
Size 10 KB
Load time 26 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
Open-Sans-700.woff2 woff2 swap
Size 10 KB
Load time 46 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
INSEE_icoFont.woff woff swap
Size 23 KB
Load time 62 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Open-Sans-600.woff2 woff2 swap
Size 10 KB
Load time 49 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
remixicon.woff2 woff2 swap
Size 162 KB
Load time 99 ms
Start 1.2 s
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
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 ~88 KB and ~176 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
48 requests over 1411ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 8.1 s LCP 13.5 shttps://insee.fr// https://insee.fr/ — 302 — 45 B — 88 ms — h2https://www.insee.fr/www.insee.fr/ https://www.insee.fr/ — 301 — 498 B — 129 ms — h2https://www.insee.fr/fr/accueilwww.insee.fr/fr/accueil https://www.insee.fr/fr/accueil — 200 — 17.6 KiB — 98 ms — h2https://www.insee.fr/static/css/application.csswww.insee.fr/static/css/application... https://www.insee.fr/static/css/application.css — 200 — 84.4 KiB — 202 ms — h2https://www.insee.fr/static/css/featherlight/featherlight.csswww.insee.fr/static/css/featherligh... https://www.insee.fr/static/css/featherlight/featherlight.css — 200 — 1.5 KiB — 100 ms — h2https://www.insee.fr/static/css/swiper/swiper.min.csswww.insee.fr/static/css/swiper/swip... https://www.insee.fr/static/css/swiper/swiper.min.css — 200 — 3.1 KiB — 164 ms — h2https://www.insee.fr/static/css/dateTimePicker/jquery.datetimepicker.csswww.insee.fr/static/css/dateTimePic... https://www.insee.fr/static/css/dateTimePicker/jquery.datetimepicker.css — 200 — 3.9 KiB — 160 ms — h2https://www.insee.fr/static/build/highcharts.jswww.insee.fr/static/build/highchart... https://www.insee.fr/static/build/highcharts.js — 200 — 322.4 KiB — 369 ms — h2https://www.insee.fr/static/build/highcharts-insee.jswww.insee.fr/static/build/highchart... https://www.insee.fr/static/build/highcharts-insee.js — 200 — 585.5 KiB — 473 ms — h2https://www.insee.fr/static/img/preloader.gifwww.insee.fr/static/img/preloader.g... https://www.insee.fr/static/img/preloader.gif — 200 — 15.7 KiB — 176 ms — h2https://www.insee.fr/static/img/pictooreille.svgwww.insee.fr/static/img/pictooreill... https://www.insee.fr/static/img/pictooreille.svg — 200 — 2.6 KiB — 117 ms — h2https://www.insee.fr/static/img/logoInseeFr.svgwww.insee.fr/static/img/logoInseeFr... https://www.insee.fr/static/img/logoInseeFr.svg — 200 — 10.0 KiB — 110 ms — h2https://www.insee.fr/static/js/svg/graphsvg.jswww.insee.fr/static/js/svg/graphsvg... https://www.insee.fr/static/js/svg/graphsvg.js — 200 — 10.2 KiB — 40 ms — h2https://www.insee.fr/static/js/application-lib.min.jswww.insee.fr/static/js/application-... https://www.insee.fr/static/js/application-lib.min.js — 200 — 259.0 KiB — 139 ms — h2https://www.insee.fr/static/build/application.jswww.insee.fr/static/build/applicati... https://www.insee.fr/static/build/application.js — 200 — 117.1 KiB — 136 ms — h2https://www.insee.fr/static/build/htmx.min.jswww.insee.fr/static/build/htmx.min.... https://www.insee.fr/static/build/htmx.min.js — 200 — 21.4 KiB — 31 ms — h2https://www.insee.fr/image/actualite/8982301/blogInsee_2026_04_hausse_des_prix_de_l_essence_pour_les_m%C3%A9nages_fr_bandeau.pngwww.insee.fr/image/actualite/898230... https://www.insee.fr/image/actualite/8982301/blogInsee_2026_04_hausse_des_prix_de_l_essence_pour_les_m%C3%A9nages_fr_bandeau.png — 200 — 83.5 KiB — 105 ms — h2https://www.insee.fr/image/actualite/8546313/Bandeau_CPT_inseefr_2026.pngwww.insee.fr/image/actualite/854631... https://www.insee.fr/image/actualite/8546313/Bandeau_CPT_inseefr_2026.png — 200 — 96.9 KiB — 108 ms — h2https://www.insee.fr/image/actualite/8734429/Bandeau%20naf%20vfinale.pngwww.insee.fr/image/actualite/873442... https://www.insee.fr/image/actualite/8734429/Bandeau%20naf%20vfinale.png — 200 — 18.6 KiB — 83 ms — h2https://www.insee.fr/image/actualite/7724909/Bandeau%20Ensai.pngwww.insee.fr/image/actualite/772490... https://www.insee.fr/image/actualite/7724909/Bandeau%20Ensai.png — 200 — 77.1 KiB — 71 ms — h2https://www.insee.fr/static/img/a-la-une/collection.pngwww.insee.fr/static/img/a-la-une/co... https://www.insee.fr/static/img/a-la-une/collection.png — 200 — 1.6 KiB — 25 ms — h2https://cdn.matomo.cloud/insee.matomo.cloud/container_j86K86K5.jscdn.matomo.cloud/insee.matomo.cloud... https://cdn.matomo.cloud/insee.matomo.cloud/container_j86K86K5.js — 200 — 50.3 KiB — 43 ms — h2https://www.insee.fr/fr/statistiques/vignette/8967255/Image_accueil.pngwww.insee.fr/fr/statistiques/vignet... https://www.insee.fr/fr/statistiques/vignette/8967255/Image_accueil.png — 200 — 1.5 KiB — 45 ms — h2https://www.insee.fr/static/img/a-la-une/conjoncture.pngwww.insee.fr/static/img/a-la-une/co... https://www.insee.fr/static/img/a-la-une/conjoncture.png — 200 — 1.3 KiB — 41 ms — h2https://www.insee.fr/static/img/logo-bluesky.svgwww.insee.fr/static/img/logo-bluesk... https://www.insee.fr/static/img/logo-bluesky.svg — 200 — 951 B — 33 ms — h2https://www.insee.fr/static/img/logo-instagram-small.pngwww.insee.fr/static/img/logo-instag... https://www.insee.fr/static/img/logo-instagram-small.png — 200 — 5.8 KiB — 36 ms — h2https://www.insee.fr/static/img/footer/sse.pngwww.insee.fr/static/img/footer/sse.... https://www.insee.fr/static/img/footer/sse.png — 200 — 5.4 KiB — 36 ms — h2https://www.insee.fr/static/img/footer/Reseau_quetelet.pngwww.insee.fr/static/img/footer/Rese... https://www.insee.fr/static/img/footer/Reseau_quetelet.png — 200 — 8.6 KiB — 35 ms — h2data:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20viewBox%…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20viewBox%… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20viewBox%…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20viewBox%… — 200 — 0 B — 0 ms — data
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 8.1 s LCP 13.5 shttps://insee.fr// https://insee.fr/ — 302 — 45 B — 88 ms — h2https://www.insee.fr/www.insee.fr/ https://www.insee.fr/ — 301 — 498 B — 129 ms — h2https://www.insee.fr/fr/accueilwww.insee.fr/fr/accueil https://www.insee.fr/fr/accueil — 200 — 17.6 KiB — 98 ms — h2https://www.insee.fr/static/css/application.csswww.insee.fr/static/css/application... https://www.insee.fr/static/css/application.css — 200 — 84.4 KiB — 202 ms — h2https://www.insee.fr/static/css/featherlight/featherlight.csswww.insee.fr/static/css/featherligh... https://www.insee.fr/static/css/featherlight/featherlight.css — 200 — 1.5 KiB — 100 ms — h2https://www.insee.fr/static/css/swiper/swiper.min.csswww.insee.fr/static/css/swiper/swip... https://www.insee.fr/static/css/swiper/swiper.min.css — 200 — 3.1 KiB — 164 ms — h2https://www.insee.fr/static/css/dateTimePicker/jquery.datetimepicker.csswww.insee.fr/static/css/dateTimePic... https://www.insee.fr/static/css/dateTimePicker/jquery.datetimepicker.css — 200 — 3.9 KiB — 160 ms — h2https://www.insee.fr/static/build/highcharts.jswww.insee.fr/static/build/highchart... https://www.insee.fr/static/build/highcharts.js — 200 — 322.4 KiB — 369 ms — h2https://www.insee.fr/static/build/highcharts-insee.jswww.insee.fr/static/build/highchart... https://www.insee.fr/static/build/highcharts-insee.js — 200 — 585.5 KiB — 473 ms — h2https://www.insee.fr/static/img/preloader.gifwww.insee.fr/static/img/preloader.g... https://www.insee.fr/static/img/preloader.gif — 200 — 15.7 KiB — 176 ms — h2https://www.insee.fr/static/img/pictooreille.svgwww.insee.fr/static/img/pictooreill... https://www.insee.fr/static/img/pictooreille.svg — 200 — 2.6 KiB — 117 ms — h2https://www.insee.fr/static/img/logoInseeFr.svgwww.insee.fr/static/img/logoInseeFr... https://www.insee.fr/static/img/logoInseeFr.svg — 200 — 10.0 KiB — 110 ms — h2https://www.insee.fr/static/js/svg/graphsvg.jswww.insee.fr/static/js/svg/graphsvg... https://www.insee.fr/static/js/svg/graphsvg.js — 200 — 10.2 KiB — 40 ms — h2https://www.insee.fr/static/js/application-lib.min.jswww.insee.fr/static/js/application-... https://www.insee.fr/static/js/application-lib.min.js — 200 — 259.0 KiB — 139 ms — h2https://www.insee.fr/static/build/application.jswww.insee.fr/static/build/applicati... https://www.insee.fr/static/build/application.js — 200 — 117.1 KiB — 136 ms — h2https://www.insee.fr/static/build/htmx.min.jswww.insee.fr/static/build/htmx.min.... https://www.insee.fr/static/build/htmx.min.js — 200 — 21.4 KiB — 31 ms — h2https://www.insee.fr/image/actualite/8982301/blogInsee_2026_04_hausse_des_prix_de_l_essence_pour_les_m%C3%A9nages_fr_bandeau.pngwww.insee.fr/image/actualite/898230... https://www.insee.fr/image/actualite/8982301/blogInsee_2026_04_hausse_des_prix_de_l_essence_pour_les_m%C3%A9nages_fr_bandeau.png — 200 — 83.5 KiB — 105 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 2525ms · 1235KB · €27/mo
www.insee.fr
Other
Costly
Execution 919ms
Transfer 586 KB
Unused 65%
Monthly Cost €10/mo
www.insee.fr
Other
Costly
Execution 816ms
Transfer 259 KB
Unused 75%
Monthly Cost €9/mo
Unattributable
Other
Costly
Execution 330ms
Transfer 0 KB
Monthly Cost €4/mo
www.insee.fr
Other
Costly
Execution 247ms
Transfer 322 KB
Unused 84%
Monthly Cost €3/mo
www.insee.fr
Other
Optional
Execution 151ms
Transfer 18 KB
Monthly Cost €2/mo
Matomo
Analytics
Optional
Execution 63ms
Transfer 50 KB
Unused 54%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.insee.fr adds 919ms and costs ~€10/month
  • www.insee.fr adds 816ms and costs ~€9/month
  • Unattributable adds 330ms and costs ~€4/month
  • www.insee.fr adds 247ms 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.insee.fr takes 919ms 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

65% of www.insee.fr'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.insee.fr takes 816ms 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

75% of www.insee.fr's code is unused. The script may be loading features you don't use.

Why this matters

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

Source: web.dev

Unattributable takes 330ms 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.insee.fr takes 247ms 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

84% of www.insee.fr'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

54% of Matomo'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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