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https://openstreetmap.fr

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
89
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.

1.37 s

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

1.67 s

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

0 ms

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

0.003

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

1.37 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.

1.68 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
15
7 PASS 4 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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
60 resources · 1.7 MB · 123 KB savings available
FIX
60 resources · 1.7 MB · 123 KB savings available
Warning::
Page weight 752 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~123 KB of savings available
Warning::
59 third-party resources (100% of weight)
Info::
2 resources over 200KB
60 resources · 1.7 MiB · 59 third-party 751.7 KiB over 1MB target
Image 58% · 1.0 MiB
CSS 17% · 307.9 KiB
JavaScript 16% · 289.3 KiB
Font 7% · 132.1 KiB
Document 1% · 14.1 KiB

~123.3 KiB of savings available

Remove unused JavaScript: 123.3 KiB
C
Page Weight Budget
Action
1.7 MB transferred, 60 requests
REVIEW
1.7 MB transferred, 60 requests
Info::
Page weighs 1.9 MB (1.7 MB transferred)
Warning::
Images are 1.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.0 MB
Info::
CSS is 308 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 308 KB
Info::
60 HTTP requests
Info::
Estimated 0.36 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
60 requests
0.36 g CO2 per page load
Images 1.0 MiB 58%
CSS 307.9 KiB 17%
JavaScript 289.3 KiB 16%
Fonts 132.1 KiB 7%
HTML 13.4 KiB 1%
Other 3.3 KiB 0%
Other 290 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

B
Image Optimization
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Info::
All images are well-optimized
33 images 1.0 MB
0 oversized -0 KB
25 legacy format
0 missing dimensions CLS risk
B
JS Bundles
13 scripts, 123 KB unused
REVIEW
13 scripts, 123 KB unused
Warning::
https://www.openstreetmap.fr/wp-includes/js/jquery...: 55 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://stats.openstreetmap.fr/matomo.js: 38 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.openstreetmap.fr/wp-content/cache/auto...: 30 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 123 KB
123 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.openstreetmap.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.186 KB55 KB (65%)✓3rd
https://stats.openstreetmap.fr/matomo.js67 KB38 KB (57%)✓3rd
https://www.openstreetmap.fr/wp-content/cache/autoptimize/js/autoptimize_d855921db9ad57204680b65ce48b1922.js43 KB30 KB (71%)✓3rd
https://osm-fr.github.io/osm-fr-front-map/assets/leaflet-providers.js4 KB—✓3rd
https://www.openstreetmap.fr/wp-content/plugins/autoptimize/classes/external/js/lazysizes.min.js?ao_version=3.1.15.110 KB—✓3rd
https://osm-fr.github.io/osm-fr-front-map/3rdparties/leaflet.js39 KB—✓3rd
https://www.openstreetmap.fr/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed3667933756 KB—✓3rd
https://osm-fr.github.io/osm-fr-front-map/assets/L.Control.Layers.Minimap.js4 KB—✓3rd
https://osm-fr.github.io/osm-fr-front-map/assets/shared.js1 KB—✓3rd
https://osm-fr.github.io/osm-fr-front-map/assets/preview.js2 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+
JS Execution Cost
181ms total JS execution
PASS
181ms total JS execution
Info::
https://www.openstreetmap.fr/: 111ms CPU time
Info::
Unattributable: 70ms CPU time
Warning::
Third-party scripts: 181ms (100% of total)

Main Thread Breakdown

Other 31% Script Evaluation 30% Style & Layout 22% Parse HTML & CSS 8% Rendering 7%
ScriptTotalScriptingParse/CompileParty
https://www.openstreetmap.fr/111ms20ms1ms3rd
Unattributable70ms5ms0ms3rd
A+
Font Loading
3 fonts (132 KB)
PASS
3 fonts (132 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

132 KB total

Render-blocking

0

of 3

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 FCP 1.4 s LCP 1.7 sdata:application/x-font-woff;charset=utf-8;base64,d09GRgABAAAAAHvwAAsAAAAA3EgAAQAAAAAAAAAAAAAAAAAAA…x-font-woff;charset=utf... data:application/x-font-woff;charset=utf-8;base64,d09GRgABAAAAAHvwAAsAAAAA3EgAAQAAAAAAAAAAAAAAAAAAA… — 31.0 KiB — 67 ms — font-display: swaphttps://www.openstreetmap.fr/wp-content/themes/accelerate/fontawesome/fonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.openstreetmap.fr/wp-content/themes/accelerate/fontawesome/fonts/fa-regular-400.woff2 — 25.2 KiB — 23 ms — font-display: swaphttps://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0 — 75.9 KiB — 78 ms — font-display: swap
x-font-woff;charset=utf... woff swap
Size 31 KB
Load time 67 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-regular-400.woff2 woff2 swap
Size 25 KB
Load time 23 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 woff2 swap
Size 76 KB
Load time 78 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~9 KB and ~18 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
60 requests over 2450ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.4 s LCP 1.7 shttps://openstreetmap.fr// https://openstreetmap.fr/ — 301 — 361 B — 255 ms — http/1.1https://www.openstreetmap.fr/www.openstreetmap.fr/ https://www.openstreetmap.fr/ — 200 — 12.5 KiB — 635 ms — http/1.1https://www.openstreetmap.fr/wp-content/cache/autoptimize/css/autoptimize_926bc516562473a7117b3a7ddbf00706.csswww.openstreetmap.fr/wp-content/cac... https://www.openstreetmap.fr/wp-content/cache/autoptimize/css/autoptimize_926bc516562473a7117b3a7ddbf00706.css — 200 — 238.2 KiB — 79 ms — http/1.1https://www.openstreetmap.fr/wp-includes/css/dashicons.min.css?ver=6.9.4www.openstreetmap.fr/wp-includes/cs... https://www.openstreetmap.fr/wp-includes/css/dashicons.min.css?ver=6.9.4 — 200 — 58.0 KiB — 86 ms — http/1.1https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css?ver=3.0.5maxcdn.bootstrapcdn.com/font-awesom... https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css?ver=3.0.5 — 200 — 7.4 KiB — 46 ms — h3https://www.openstreetmap.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.openstreetmap.fr/wp-includes/js... https://www.openstreetmap.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 85.9 KiB — 88 ms — http/1.1https://www.openstreetmap.fr/wp-content/uploads/2025/10/800px-Sotm_logo_xxl_color_grayback.pngwww.openstreetmap.fr/wp-content/upl... https://www.openstreetmap.fr/wp-content/uploads/2025/10/800px-Sotm_logo_xxl_color_grayback.png — 200 — 77.2 KiB — 86 ms — http/1.1https://www.openstreetmap.fr/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1www.openstreetmap.fr/wp-includes/js... https://www.openstreetmap.fr/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1 — 200 — 5.9 KiB — 61 ms — http/1.1https://www.openstreetmap.fr/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375www.openstreetmap.fr/wp-includes/js... https://www.openstreetmap.fr/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375 — 200 — 5.5 KiB — 61 ms — http/1.1https://www.openstreetmap.fr/wp-content/plugins/autoptimize/classes/external/js/lazysizes.min.js?ao_version=3.1.15.1www.openstreetmap.fr/wp-content/plu... https://www.openstreetmap.fr/wp-content/plugins/autoptimize/classes/external/js/lazysizes.min.js?ao_version=3.1.15.1 — 200 — 9.9 KiB — 21 ms — http/1.1https://www.openstreetmap.fr/wp-content/cache/autoptimize/js/autoptimize_d855921db9ad57204680b65ce48b1922.jswww.openstreetmap.fr/wp-content/cac... https://www.openstreetmap.fr/wp-content/cache/autoptimize/js/autoptimize_d855921db9ad57204680b65ce48b1922.js — 200 — 43.0 KiB — 23 ms — http/1.1data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%2093%2093%22%…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%2093%2093%22%… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20600%20330%2…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20600%20330%2… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20343%20191%2…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20343%20191%2… — 200 — 0 B — 0 ms — datahttps://osm-fr.github.io/osm-fr-front-map/index.htmlosm-fr.github.io/osm-fr-front-map/i... https://osm-fr.github.io/osm-fr-front-map/index.html — 200 — 916 B — 6 ms — h2data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%201024%20683%…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%201024%20683%… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20683%20605%2…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20683%20605%2… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%201024%20244%…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%201024%20244%… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20210%20140%2…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20210%20140%2… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%2014%2014%22%…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%2014%2014%22%… — 200 — 0 B — 0 ms — datahttps://www.openstreetmap.fr/wp-content/uploads/2019/03/Capture-du-2018-04-27-21-13-37-q80.jpgwww.openstreetmap.fr/wp-content/upl... https://www.openstreetmap.fr/wp-content/uploads/2019/03/Capture-du-2018-04-27-21-13-37-q80.jpg — 200 — 206.8 KiB — 54 ms — http/1.1data:application/x-font-woff;charset=utf-8;base64,d09GRgABAAAAAHvwAAsAAAAA3EgAAQAAAAAAAAAAAAAAAAAAA…data:application/x-font-woff;charse... data:application/x-font-woff;charset=utf-8;base64,d09GRgABAAAAAHvwAAsAAAAA3EgAAQAAAAAAAAAAAAAAAAAAA… — 200 — 31.0 KiB — 67 ms — datahttps://osm-fr.github.io/osm-fr-front-map/3rdparties/leaflet.cssosm-fr.github.io/osm-fr-front-map/3... https://osm-fr.github.io/osm-fr-front-map/3rdparties/leaflet.css — 200 — 3.3 KiB — 5 ms — h2https://osm-fr.github.io/osm-fr-front-map/assets/control.layers.minimap.cssosm-fr.github.io/osm-fr-front-map/a... https://osm-fr.github.io/osm-fr-front-map/assets/control.layers.minimap.css — 200 — 530 B — 3 ms — h2https://osm-fr.github.io/osm-fr-front-map/assets/control.layers.minimap.custom.cssosm-fr.github.io/osm-fr-front-map/a... https://osm-fr.github.io/osm-fr-front-map/assets/control.layers.minimap.custom.css — 200 — 566 B — 9 ms — h2https://osm-fr.github.io/osm-fr-front-map/3rdparties/leaflet.jsosm-fr.github.io/osm-fr-front-map/3... https://osm-fr.github.io/osm-fr-front-map/3rdparties/leaflet.js — 200 — 38.7 KiB — 15 ms — h2https://osm-fr.github.io/osm-fr-front-map/assets/leaflet-providers.jsosm-fr.github.io/osm-fr-front-map/a... https://osm-fr.github.io/osm-fr-front-map/assets/leaflet-providers.js — 200 — 3.6 KiB — 8 ms — h2https://osm-fr.github.io/osm-fr-front-map/assets/L.Control.Layers.Minimap.jsosm-fr.github.io/osm-fr-front-map/a... https://osm-fr.github.io/osm-fr-front-map/assets/L.Control.Layers.Minimap.js — 200 — 3.9 KiB — 10 ms — h2https://osm-fr.github.io/osm-fr-front-map/assets/shared.jsosm-fr.github.io/osm-fr-front-map/a... https://osm-fr.github.io/osm-fr-front-map/assets/shared.js — 200 — 1.0 KiB — 12 ms — h2https://osm-fr.github.io/osm-fr-front-map/assets/preview.jsosm-fr.github.io/osm-fr-front-map/a... https://osm-fr.github.io/osm-fr-front-map/assets/preview.js — 200 — 2.5 KiB — 9 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.4 s LCP 1.7 shttps://openstreetmap.fr// https://openstreetmap.fr/ — 301 — 361 B — 255 ms — http/1.1https://www.openstreetmap.fr/www.openstreetmap.fr/ https://www.openstreetmap.fr/ — 200 — 12.5 KiB — 635 ms — http/1.1https://www.openstreetmap.fr/wp-content/cache/autoptimize/css/autoptimize_926bc516562473a7117b3a7ddbf00706.csswww.openstreetmap.fr/wp-content/cac... https://www.openstreetmap.fr/wp-content/cache/autoptimize/css/autoptimize_926bc516562473a7117b3a7ddbf00706.css — 200 — 238.2 KiB — 79 ms — http/1.1https://www.openstreetmap.fr/wp-includes/css/dashicons.min.css?ver=6.9.4www.openstreetmap.fr/wp-includes/cs... https://www.openstreetmap.fr/wp-includes/css/dashicons.min.css?ver=6.9.4 — 200 — 58.0 KiB — 86 ms — http/1.1https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css?ver=3.0.5maxcdn.bootstrapcdn.com/font-awesom... https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css?ver=3.0.5 — 200 — 7.4 KiB — 46 ms — h3https://www.openstreetmap.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.openstreetmap.fr/wp-includes/js... https://www.openstreetmap.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 85.9 KiB — 88 ms — http/1.1https://www.openstreetmap.fr/wp-content/uploads/2025/10/800px-Sotm_logo_xxl_color_grayback.pngwww.openstreetmap.fr/wp-content/upl... https://www.openstreetmap.fr/wp-content/uploads/2025/10/800px-Sotm_logo_xxl_color_grayback.png — 200 — 77.2 KiB — 86 ms — http/1.1https://www.openstreetmap.fr/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1www.openstreetmap.fr/wp-includes/js... https://www.openstreetmap.fr/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1 — 200 — 5.9 KiB — 61 ms — http/1.1https://www.openstreetmap.fr/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375www.openstreetmap.fr/wp-includes/js... https://www.openstreetmap.fr/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375 — 200 — 5.5 KiB — 61 ms — http/1.1https://www.openstreetmap.fr/wp-content/plugins/autoptimize/classes/external/js/lazysizes.min.js?ao_version=3.1.15.1www.openstreetmap.fr/wp-content/plu... https://www.openstreetmap.fr/wp-content/plugins/autoptimize/classes/external/js/lazysizes.min.js?ao_version=3.1.15.1 — 200 — 9.9 KiB — 21 ms — http/1.1https://www.openstreetmap.fr/wp-content/cache/autoptimize/js/autoptimize_d855921db9ad57204680b65ce48b1922.jswww.openstreetmap.fr/wp-content/cac... https://www.openstreetmap.fr/wp-content/cache/autoptimize/js/autoptimize_d855921db9ad57204680b65ce48b1922.js — 200 — 43.0 KiB — 23 ms — http/1.1data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%2093%2093%22%…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%2093%2093%22%… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20600%20330%2…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20600%20330%2… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20343%20191%2…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20343%20191%2… — 200 — 0 B — 0 ms — datahttps://osm-fr.github.io/osm-fr-front-map/index.htmlosm-fr.github.io/osm-fr-front-map/i... https://osm-fr.github.io/osm-fr-front-map/index.html — 200 — 916 B — 6 ms — h2data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%201024%20683%…www.w3.org/2000/svg%22%20viewBox=%2... data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%201024%20683%… — 200 — 0 B — 0 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 181ms · 13KB · €1/mo
www.openstreetmap.fr
Other
Optional
Execution 111ms
Transfer 13 KB
Monthly Cost €0/mo
Unattributable
Other
Optional
Execution 70ms
Transfer 0 KB
Monthly Cost €0/mo

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

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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