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https://openstreetmap.fr

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
1
REVIEW
6
PASS
8
INFO
2

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

Mobile Desktop
48
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

4.69 s

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

6.68 s

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

6 ms

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

0.342

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

4.69 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.

9.28 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
8 PASS 6 REVIEW 1 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 (1.4 MiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
B
Page Weight Budget
1.4 MB transferred, 49 requests
REVIEW
1.4 MB transferred, 49 requests
Info::
Page weighs 1.5 MB (1.4 MB transferred)
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::
49 HTTP requests
Info::
Estimated 0.28 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
49 requests
0.28 g CO2 per page load
Images 692.9 KiB 50%
CSS 307.9 KiB 22%
JavaScript 289.1 KiB 21%
Fonts 75.9 KiB 5%
HTML 13.4 KiB 1%
Other 3.3 KiB 0%
Other 290 B 0%
0 2.4 MB 4.9 MB
Under budget

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
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Info::
All images are well-optimized
24 images 693 KB
0 oversized -0 KB
16 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
653ms total JS execution
REVIEW
653ms total JS execution
Warning::
https://www.openstreetmap.fr/: 307ms CPU time
Info::
Unattributable: 234ms CPU time
Info::
https://www.openstreetmap.fr/wp-content/cache/auto...: 61ms CPU time
Info::
https://www.openstreetmap.fr/wp-includes/js/jquery...: 51ms CPU time
Warning::
Third-party scripts: 653ms (100% of total)

Main Thread Breakdown

Other 34% Script Evaluation 24% Style & Layout 19% Parse HTML & CSS 14% Rendering 6% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://www.openstreetmap.fr/307ms46ms4ms3rd
Unattributable234ms11ms0ms3rd
https://www.openstreetmap.fr/wp-content/cache/autoptimize/css/autoptimize_926bc516562473a7117b3a7ddbf00706.css61ms0ms0ms3rd
https://www.openstreetmap.fr/wp-includes/js/jquery/jquery.min.js?ver=3.7.151ms38ms7ms3rd
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
blob:https://www.openstreetmap.fr/73dd5849-de67-4c55-9579-90d913719a57-0 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://www.openstreetmap.fr/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed3667933756 KB—✓3rd
https://www.openstreetmap.fr/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f16 KB—✓3rd
https://www.openstreetmap.fr/wp-includes/js/wp-emoji-release.min.js?ver=6.9.423 KB—✓3rd
https://osm-fr.github.io/osm-fr-front-map/3rdparties/leaflet.js39 KB—✓3rd
https://osm-fr.github.io/osm-fr-front-map/assets/leaflet-providers.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
Page Weight Inventory
Action
49 resources · 1.4 MB · 123 KB savings available
REVIEW
49 resources · 1.4 MB · 123 KB savings available
Warning::
Page weight 359 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~123 KB of savings available
Warning::
48 third-party resources (100% of weight)
Info::
2 resources over 200KB
49 resources · 1.4 MiB · 48 third-party 358.8 KiB over 1MB target
Image 50% · 695.8 KiB
CSS 22% · 307.9 KiB
JavaScript 21% · 289.1 KiB
Font 5% · 75.9 KiB
Document 1% · 14.1 KiB

~123.3 KiB of savings available

Remove unused JavaScript: 123.3 KiB
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
1 fonts (76 KB)
PASS
1 fonts (76 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

76 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.7 s LCP 6.7 shttps://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 — 69 ms — font-display: swap
fontawesome-webfont.woff2 woff2 swap
Size 76 KB
Load time 69 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)
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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
1
prefetch
—

1 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
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
49 requests over 1905ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.7 s LCP 6.7 shttps://openstreetmap.fr// https://openstreetmap.fr/ — 301 — 361 B — 342 ms — http/1.1https://www.openstreetmap.fr/www.openstreetmap.fr/ https://www.openstreetmap.fr/ — 200 — 12.5 KiB — 640 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 — 74 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 — 88 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 — 48 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 — 87 ms — http/1.1https://www.openstreetmap.fr/wp-content/uploads/2025/10/800px-Sotm_logo_xxl_color_grayback-768x479.pngwww.openstreetmap.fr/wp-content/upl... https://www.openstreetmap.fr/wp-content/uploads/2025/10/800px-Sotm_logo_xxl_color_grayback-768x479.png — 200 — 23.4 KiB — 73 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 — 58 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 — 57 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 — 22 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 — 21 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 — datadata: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 — 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 — 919 B — 173 ms — h2data: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 — 52 ms — http/1.1https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0maxcdn.bootstrapcdn.com/font-awesom... https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0 — 200 — 75.9 KiB — 69 ms — h3https://stats.openstreetmap.fr/matomo.jsstats.openstreetmap.fr/matomo.js https://stats.openstreetmap.fr/matomo.js — 200 — 66.8 KiB — 151 ms — http/1.1blob:https://www.openstreetmap.fr/73dd5849-de67-4c55-9579-90d913719a57www.openstreetmap.fr/73dd5849-de67-... blob:https://www.openstreetmap.fr/73dd5849-de67-4c55-9579-90d913719a57 — 200 — -1 B — 53 ms — blobhttps://www.openstreetmap.fr/wp-content/uploads/2024/07/cropped-cropped-cropped-Logo-OSM-2024-e1720618276656.pngwww.openstreetmap.fr/wp-content/upl... https://www.openstreetmap.fr/wp-content/uploads/2024/07/cropped-cropped-cropped-Logo-OSM-2024-e1720618276656.png — 200 — 12.9 KiB — 20 ms — http/1.1https://www.openstreetmap.fr/wp-includes/js/wp-emoji-release.min.js?ver=6.9.4www.openstreetmap.fr/wp-includes/js... https://www.openstreetmap.fr/wp-includes/js/wp-emoji-release.min.js?ver=6.9.4 — 200 — 22.6 KiB — 19 ms — http/1.1https://s.w.org/images/core/emoji/17.0.2/svg/1f4e2.svgs.w.org/images/core/emoji/17.0.2/sv... https://s.w.org/images/core/emoji/17.0.2/svg/1f4e2.svg — 200 — 715 B — 24 ms — h2https://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 — 148 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 — 513 B — 173 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 — 550 B — 150 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 FCP 4.7 s LCP 6.7 shttps://openstreetmap.fr// https://openstreetmap.fr/ — 301 — 361 B — 342 ms — http/1.1https://www.openstreetmap.fr/www.openstreetmap.fr/ https://www.openstreetmap.fr/ — 200 — 12.5 KiB — 640 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 — 74 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 — 88 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 — 48 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 — 87 ms — http/1.1https://www.openstreetmap.fr/wp-content/uploads/2025/10/800px-Sotm_logo_xxl_color_grayback-768x479.pngwww.openstreetmap.fr/wp-content/upl... https://www.openstreetmap.fr/wp-content/uploads/2025/10/800px-Sotm_logo_xxl_color_grayback-768x479.png — 200 — 23.4 KiB — 73 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 — 58 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 — 57 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 — 22 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 — 21 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 — datadata: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... 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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 653ms · 337KB · €3/mo
www.openstreetmap.fr
Other
Costly
Execution 307ms
Transfer 13 KB
Monthly Cost €1/mo
Unattributable
Other
Costly
Execution 234ms
Transfer 0 KB
Monthly Cost €1/mo
www.openstreetmap.fr
Other
Optional
Execution 61ms
Transfer 238 KB
Monthly Cost €0/mo
www.openstreetmap.fr
Other
Optional
Execution 51ms
Transfer 86 KB
Unused 65%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.openstreetmap.fr adds 307ms and costs ~€1/month
  • Unattributable adds 234ms and costs ~€1/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.openstreetmap.fr takes 307ms 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 234ms 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.openstreetmap.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

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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