Skip to content
https://openstreetmap.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
4
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
91
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.
92
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.

1.09 s

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

1.71 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.

0.000

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

1.17 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.

1.72 s

Page Load Progression

400 ms
801 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
15
7 PASS 2 REVIEW 4 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
F
JS Bundles
Action
7 scripts, 347 KB unused
FIX
7 scripts, 347 KB unused
Warning::
https://www.openstreetmap.org/assets/application-c...: 318 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.openstreetmap.org/assets/application-c...: unminified — 115 KB could be saved
Warning::
https://www.openstreetmap.org/assets/turbo-ddc4446...: 30 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.openstreetmap.org/assets/turbo-ddc4446...: unminified — 7 KB could be saved
Info::
Total unused JavaScript: 347 KB
347 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.openstreetmap.org/assets/application-c54179f4131c35c0bda3948cb81c345c2da4a81d7ed270b94c70dc2ae7a1dda8.js490 KB318 KB (65%)✗3rd
https://www.openstreetmap.org/assets/turbo-ddc44468c3f2a177272c2635e622ef6a909e2fa74c250a9f98a31a94a87d1d29.js35 KB30 KB (84%)✗3rd
https://www.openstreetmap.org/assets/index-e3ac32a59914bec0aac759b752393239d44d5f9baf1cc067af403f1f03b77e14.js44 KB—✓3rd
https://www.openstreetmap.org/assets/i18n/en-dd1b503e1e8daf7760ea43a9cfa0866825e87e455d6f6a0d661aad6536be460d.js10 KB—✗3rd
blob:https://www.openstreetmap.org/208acaeb-e84b-42ac-b6ac-bce6035fd229-0 KB—✓3rd
https://www.openstreetmap.org/assets/make-plural/cardinals-cbbf892e6bf25f4dbbcf7776eee157ce78502c06a15a02ad32ca39aecfc50867.js2 KB—✓3rd
https://matomo.openstreetmap.org/matomo.js19 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

D
Page Weight Inventory
Action
58 resources · 1.4 MB · 347 KB savings available
FIX
58 resources · 1.4 MB · 347 KB savings available
Warning::
Page weight 393 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~347 KB of savings available
Warning::
57 third-party resources (100% of weight)
Info::
1 resources over 200KB
58 resources · 1.4 MiB · 57 third-party 393.2 KiB over 1MB target
Image 44% · 617.2 KiB
JavaScript 42% · 601.1 KiB
Font 9% · 131.2 KiB
CSS 4% · 56.0 KiB
Document 1% · 10.5 KiB
Other 0% · 1.2 KiB

~347.2 KiB of savings available

Remove unused JavaScript: 347.2 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
Page Weight Budget
1.4 MB transferred, 58 requests
REVIEW
1.4 MB transferred, 58 requests
Info::
Page weighs 4.2 MB (1.4 MB transferred)
Warning::
JavaScript is 601 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 601 KB
Info::
58 HTTP requests
Info::
Estimated 0.29 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
58 requests
0.29 g CO2 per page load
JavaScript 601.1 KiB 42%
Images 585.9 KiB 41%
Fonts 131.2 KiB 9%
CSS 56.0 KiB 4%
Other 31.5 KiB 2%
HTML 8.5 KiB 1%
Other 2.0 KiB 0%
Other 961 B 0%
Other 102 B 0%
0 2.4 MB 4.9 MB
Under 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

B
Image Optimization
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Info::
All images are well-optimized
38 images 586 KB
0 oversized -0 KB
37 legacy format
0 missing dimensions CLS risk
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
485ms total JS execution
PASS
485ms total JS execution
Info::
https://www.openstreetmap.org/assets/application-c...: 248ms CPU time
Info::
Unattributable: 128ms CPU time
Info::
https://www.openstreetmap.org/assets/turbo-ddc4446...: 54ms CPU time
Info::
https://www.openstreetmap.org/: 54ms CPU time
Warning::
Third-party scripts: 485ms (100% of total)

Main Thread Breakdown

Other 35% Script Evaluation 32% Script Parsing & Compilation 16% Style & Layout 12%
ScriptTotalScriptingParse/CompileParty
https://www.openstreetmap.org/assets/application-c54179f4131c35c0bda3948cb81c345c2da4a81d7ed270b94c70dc2ae7a1dda8.js248ms139ms68ms3rd
Unattributable128ms4ms0ms3rd
https://www.openstreetmap.org/assets/turbo-ddc44468c3f2a177272c2635e622ef6a909e2fa74c250a9f98a31a94a87d1d29.js54ms6ms0ms3rd
https://www.openstreetmap.org/54ms1ms0ms3rd
A+
Font Loading
1 fonts (131 KB)
PASS
1 fonts (131 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

131 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 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.7 shttps://www.openstreetmap.org/assets/bootstrap-icons/font/fonts/bootstrap-icons-d58dbdc0232480708b000373bb9f5be99101ea5a95df6a9ef080912f10588790.woff2?24e3eb84d0bcaf83d77f904c78ac1f47bootstrap-icons-d58dbdc... https://www.openstreetmap.org/assets/bootstrap-icons/font/fonts/bootstrap-icons-d58dbdc0232480708b000373bb9f5be99101ea5a95df6a9ef080912f10588790.woff2?24e3eb84d0bcaf83d77f904c78ac1f47 — 131.2 KiB — 11 ms — font-display: swap
bootstrap-icons-d58dbdc... woff2 swap
Size 131 KB
Load time 11 ms
Start 668 ms
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 ~66 KB and ~132 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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
58 requests over 2052ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 1.7 shttps://openstreetmap.org// https://openstreetmap.org/ — 301 — 169 B — 20 ms — h2https://www.openstreetmap.org/www.openstreetmap.org/ https://www.openstreetmap.org/ — 200 — 8.5 KiB — 322 ms — h2https://www.openstreetmap.org/assets/index-e3ac32a59914bec0aac759b752393239d44d5f9baf1cc067af403f1f03b77e14.jswww.openstreetmap.org/assets/index-... https://www.openstreetmap.org/assets/index-e3ac32a59914bec0aac759b752393239d44d5f9baf1cc067af403f1f03b77e14.js — 200 — 44.2 KiB — 11 ms — h2https://www.openstreetmap.org/assets/turbo-ddc44468c3f2a177272c2635e622ef6a909e2fa74c250a9f98a31a94a87d1d29.jswww.openstreetmap.org/assets/turbo-... https://www.openstreetmap.org/assets/turbo-ddc44468c3f2a177272c2635e622ef6a909e2fa74c250a9f98a31a94a87d1d29.js — 200 — 35.3 KiB — 35 ms — h2https://www.openstreetmap.org/assets/application-c54179f4131c35c0bda3948cb81c345c2da4a81d7ed270b94c70dc2ae7a1dda8.jswww.openstreetmap.org/assets/applic... https://www.openstreetmap.org/assets/application-c54179f4131c35c0bda3948cb81c345c2da4a81d7ed270b94c70dc2ae7a1dda8.js — 200 — 490.0 KiB — 55 ms — h2https://www.openstreetmap.org/assets/i18n/en-dd1b503e1e8daf7760ea43a9cfa0866825e87e455d6f6a0d661aad6536be460d.jswww.openstreetmap.org/assets/i18n/e... https://www.openstreetmap.org/assets/i18n/en-dd1b503e1e8daf7760ea43a9cfa0866825e87e455d6f6a0d661aad6536be460d.js — 200 — 10.3 KiB — 12 ms — h2https://www.openstreetmap.org/assets/screen-auto-ltr-46573c72fca1195477837776bb421b53339db3f9a4345c51a3589b4a29185ce4.csswww.openstreetmap.org/assets/screen... https://www.openstreetmap.org/assets/screen-auto-ltr-46573c72fca1195477837776bb421b53339db3f9a4345c51a3589b4a29185ce4.css — 200 — 43.2 KiB — 29 ms — h2https://www.openstreetmap.org/assets/print-ltr-97dee1ca487394c852f28c2906a930316ab6d2cacf7f73e47c1c31fad8919051.csswww.openstreetmap.org/assets/print-... https://www.openstreetmap.org/assets/print-ltr-97dee1ca487394c852f28c2906a930316ab6d2cacf7f73e47c1c31fad8919051.css — 200 — 535 B — 26 ms — h2https://www.openstreetmap.org/assets/leaflet-all-d3e8505f47e0f0615d3daf2619f2267c086cbe9e17e276f393ee686dca54e0d3.csswww.openstreetmap.org/assets/leafle... https://www.openstreetmap.org/assets/leaflet-all-d3e8505f47e0f0615d3daf2619f2267c086cbe9e17e276f393ee686dca54e0d3.css — 200 — 3.0 KiB — 26 ms — h2https://www.openstreetmap.org/assets/maplibre-gl-all-671191c247be2831d2737d30b396112dc1041453bd6291863062bbaea52a940a.csswww.openstreetmap.org/assets/maplib... https://www.openstreetmap.org/assets/maplibre-gl-all-671191c247be2831d2737d30b396112dc1041453bd6291863062bbaea52a940a.css — 200 — 9.2 KiB — 20 ms — h2https://www.openstreetmap.org/assets/manifest-97cb57bafa7f7f002cc5fe5532b856c4246eef5cbbd21c78b4c6bc2ffa46747a.jsonwww.openstreetmap.org/assets/manife... https://www.openstreetmap.org/assets/manifest-97cb57bafa7f7f002cc5fe5532b856c4246eef5cbbd21c78b4c6bc2ffa46747a.json — 200 — 961 B — 21 ms — h3https://www.openstreetmap.org/assets/osm_logo-cc7d94392992162133be3baa21a37eb84f19f9b91178f704005378fbeecabb4e.svgwww.openstreetmap.org/assets/osm_lo... https://www.openstreetmap.org/assets/osm_logo-cc7d94392992162133be3baa21a37eb84f19f9b91178f704005378fbeecabb4e.svg — 200 — 10.0 KiB — 4 ms — h3blob:https://www.openstreetmap.org/208acaeb-e84b-42ac-b6ac-bce6035fd229www.openstreetmap.org/208acaeb-e84b... blob:https://www.openstreetmap.org/208acaeb-e84b-42ac-b6ac-bce6035fd229 — 200 — -1 B — 75 ms — blobhttps://www.openstreetmap.org/assets/make-plural/cardinals-cbbf892e6bf25f4dbbcf7776eee157ce78502c06a15a02ad32ca39aecfc50867.jswww.openstreetmap.org/assets/make-p... https://www.openstreetmap.org/assets/make-plural/cardinals-cbbf892e6bf25f4dbbcf7776eee157ce78502c06a15a02ad32ca39aecfc50867.js — 200 — 2.3 KiB — 3 ms — h3https://www.openstreetmap.org/assets/leaflet/dist/images/marker-shadow-a2d94406ba198f61f68a71ed8f9f9c701122c0c33b775d990edceae4aece567f.pngwww.openstreetmap.org/assets/leafle... https://www.openstreetmap.org/assets/leaflet/dist/images/marker-shadow-a2d94406ba198f61f68a71ed8f9f9c701122c0c33b775d990edceae4aece567f.png — 200 — 943 B — 4 ms — h3https://www.openstreetmap.org/assets/bootstrap-icons/font/fonts/bootstrap-icons-d58dbdc0232480708b000373bb9f5be99101ea5a95df6a9ef080912f10588790.woff2?24e3eb84d0bcaf83d77f904c78ac1f47www.openstreetmap.org/assets/bootst... https://www.openstreetmap.org/assets/bootstrap-icons/font/fonts/bootstrap-icons-d58dbdc0232480708b000373bb9f5be99101ea5a95df6a9ef080912f10588790.woff2?24e3eb84d0bcaf83d77f904c78ac1f47 — 200 — 131.2 KiB — 11 ms — h3https://matomo.openstreetmap.org/matomo.jsmatomo.openstreetmap.org/matomo.js https://matomo.openstreetmap.org/matomo.js — 200 — 19.2 KiB — 348 ms — h2https://www.openstreetmap.org/panes/layerswww.openstreetmap.org/panes/layers https://www.openstreetmap.org/panes/layers — 200 — 2.0 KiB — 287 ms — h3data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23000'%3e%3…www.w3.org/2000/svg' viewBox='0 0 1... data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23000'%3e%3… — 200 — 0 B — 0 ms — datahttps://tile.openstreetmap.org/5/7/12.pngtile.openstreetmap.org/5/7/12.png https://tile.openstreetmap.org/5/7/12.png — 200 — 19.0 KiB — 55 ms — h2https://tile.openstreetmap.org/5/7/11.pngtile.openstreetmap.org/5/7/11.png https://tile.openstreetmap.org/5/7/11.png — 200 — 19.5 KiB — 28 ms — h2https://tile.openstreetmap.org/5/6/12.pngtile.openstreetmap.org/5/6/12.png https://tile.openstreetmap.org/5/6/12.png — 200 — 19.8 KiB — 57 ms — h2https://tile.openstreetmap.org/5/8/12.pngtile.openstreetmap.org/5/8/12.png https://tile.openstreetmap.org/5/8/12.png — 200 — 27.9 KiB — 46 ms — h2https://tile.openstreetmap.org/5/7/13.pngtile.openstreetmap.org/5/7/13.png https://tile.openstreetmap.org/5/7/13.png — 200 — 14.7 KiB — 31 ms — h2https://tile.openstreetmap.org/5/6/11.pngtile.openstreetmap.org/5/6/11.png https://tile.openstreetmap.org/5/6/11.png — 200 — 11.0 KiB — 47 ms — h2https://tile.openstreetmap.org/5/8/14.pngtile.openstreetmap.org/5/8/14.png https://tile.openstreetmap.org/5/8/14.png — 200 — 19.4 KiB — 54 ms — h2https://tile.openstreetmap.org/5/5/12.pngtile.openstreetmap.org/5/5/12.png https://tile.openstreetmap.org/5/5/12.png — 200 — 24.5 KiB — 52 ms — h2https://tile.openstreetmap.org/5/10/14.pngtile.openstreetmap.org/5/10/14.png https://tile.openstreetmap.org/5/10/14.png — 200 — 9.9 KiB — 40 ms — h2https://tile.openstreetmap.org/5/8/11.pngtile.openstreetmap.org/5/8/11.png https://tile.openstreetmap.org/5/8/11.png — 200 — 33.5 KiB — 52 ms — h2https://tile.openstreetmap.org/5/6/13.pngtile.openstreetmap.org/5/6/13.png https://tile.openstreetmap.org/5/6/13.png — 200 — 16.6 KiB — 75 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 1.7 shttps://openstreetmap.org// https://openstreetmap.org/ — 301 — 169 B — 20 ms — h2https://www.openstreetmap.org/www.openstreetmap.org/ https://www.openstreetmap.org/ — 200 — 8.5 KiB — 322 ms — h2https://www.openstreetmap.org/assets/index-e3ac32a59914bec0aac759b752393239d44d5f9baf1cc067af403f1f03b77e14.jswww.openstreetmap.org/assets/index-... https://www.openstreetmap.org/assets/index-e3ac32a59914bec0aac759b752393239d44d5f9baf1cc067af403f1f03b77e14.js — 200 — 44.2 KiB — 11 ms — h2https://www.openstreetmap.org/assets/turbo-ddc44468c3f2a177272c2635e622ef6a909e2fa74c250a9f98a31a94a87d1d29.jswww.openstreetmap.org/assets/turbo-... https://www.openstreetmap.org/assets/turbo-ddc44468c3f2a177272c2635e622ef6a909e2fa74c250a9f98a31a94a87d1d29.js — 200 — 35.3 KiB — 35 ms — h2https://www.openstreetmap.org/assets/application-c54179f4131c35c0bda3948cb81c345c2da4a81d7ed270b94c70dc2ae7a1dda8.jswww.openstreetmap.org/assets/applic... https://www.openstreetmap.org/assets/application-c54179f4131c35c0bda3948cb81c345c2da4a81d7ed270b94c70dc2ae7a1dda8.js — 200 — 490.0 KiB — 55 ms — h2https://www.openstreetmap.org/assets/i18n/en-dd1b503e1e8daf7760ea43a9cfa0866825e87e455d6f6a0d661aad6536be460d.jswww.openstreetmap.org/assets/i18n/e... https://www.openstreetmap.org/assets/i18n/en-dd1b503e1e8daf7760ea43a9cfa0866825e87e455d6f6a0d661aad6536be460d.js — 200 — 10.3 KiB — 12 ms — h2https://www.openstreetmap.org/assets/screen-auto-ltr-46573c72fca1195477837776bb421b53339db3f9a4345c51a3589b4a29185ce4.csswww.openstreetmap.org/assets/screen... https://www.openstreetmap.org/assets/screen-auto-ltr-46573c72fca1195477837776bb421b53339db3f9a4345c51a3589b4a29185ce4.css — 200 — 43.2 KiB — 29 ms — h2https://www.openstreetmap.org/assets/print-ltr-97dee1ca487394c852f28c2906a930316ab6d2cacf7f73e47c1c31fad8919051.csswww.openstreetmap.org/assets/print-... https://www.openstreetmap.org/assets/print-ltr-97dee1ca487394c852f28c2906a930316ab6d2cacf7f73e47c1c31fad8919051.css — 200 — 535 B — 26 ms — h2https://www.openstreetmap.org/assets/leaflet-all-d3e8505f47e0f0615d3daf2619f2267c086cbe9e17e276f393ee686dca54e0d3.csswww.openstreetmap.org/assets/leafle... https://www.openstreetmap.org/assets/leaflet-all-d3e8505f47e0f0615d3daf2619f2267c086cbe9e17e276f393ee686dca54e0d3.css — 200 — 3.0 KiB — 26 ms — h2https://www.openstreetmap.org/assets/maplibre-gl-all-671191c247be2831d2737d30b396112dc1041453bd6291863062bbaea52a940a.csswww.openstreetmap.org/assets/maplib... https://www.openstreetmap.org/assets/maplibre-gl-all-671191c247be2831d2737d30b396112dc1041453bd6291863062bbaea52a940a.css — 200 — 9.2 KiB — 20 ms — h2https://www.openstreetmap.org/assets/manifest-97cb57bafa7f7f002cc5fe5532b856c4246eef5cbbd21c78b4c6bc2ffa46747a.jsonwww.openstreetmap.org/assets/manife... https://www.openstreetmap.org/assets/manifest-97cb57bafa7f7f002cc5fe5532b856c4246eef5cbbd21c78b4c6bc2ffa46747a.json — 200 — 961 B — 21 ms — h3https://www.openstreetmap.org/assets/osm_logo-cc7d94392992162133be3baa21a37eb84f19f9b91178f704005378fbeecabb4e.svgwww.openstreetmap.org/assets/osm_lo... https://www.openstreetmap.org/assets/osm_logo-cc7d94392992162133be3baa21a37eb84f19f9b91178f704005378fbeecabb4e.svg — 200 — 10.0 KiB — 4 ms — h3blob:https://www.openstreetmap.org/208acaeb-e84b-42ac-b6ac-bce6035fd229www.openstreetmap.org/208acaeb-e84b... blob:https://www.openstreetmap.org/208acaeb-e84b-42ac-b6ac-bce6035fd229 — 200 — -1 B — 75 ms — blobhttps://www.openstreetmap.org/assets/make-plural/cardinals-cbbf892e6bf25f4dbbcf7776eee157ce78502c06a15a02ad32ca39aecfc50867.jswww.openstreetmap.org/assets/make-p... https://www.openstreetmap.org/assets/make-plural/cardinals-cbbf892e6bf25f4dbbcf7776eee157ce78502c06a15a02ad32ca39aecfc50867.js — 200 — 2.3 KiB — 3 ms — h3https://www.openstreetmap.org/assets/leaflet/dist/images/marker-shadow-a2d94406ba198f61f68a71ed8f9f9c701122c0c33b775d990edceae4aece567f.pngwww.openstreetmap.org/assets/leafle... https://www.openstreetmap.org/assets/leaflet/dist/images/marker-shadow-a2d94406ba198f61f68a71ed8f9f9c701122c0c33b775d990edceae4aece567f.png — 200 — 943 B — 4 ms — h3https://www.openstreetmap.org/assets/bootstrap-icons/font/fonts/bootstrap-icons-d58dbdc0232480708b000373bb9f5be99101ea5a95df6a9ef080912f10588790.woff2?24e3eb84d0bcaf83d77f904c78ac1f47www.openstreetmap.org/assets/bootst... https://www.openstreetmap.org/assets/bootstrap-icons/font/fonts/bootstrap-icons-d58dbdc0232480708b000373bb9f5be99101ea5a95df6a9ef080912f10588790.woff2?24e3eb84d0bcaf83d77f904c78ac1f47 — 200 — 131.2 KiB — 11 ms — h3https://matomo.openstreetmap.org/matomo.jsmatomo.openstreetmap.org/matomo.js https://matomo.openstreetmap.org/matomo.js — 200 — 19.2 KiB — 348 ms — h2https://www.openstreetmap.org/panes/layerswww.openstreetmap.org/panes/layers https://www.openstreetmap.org/panes/layers — 200 — 2.0 KiB — 287 ms — h3data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23000'%3e%3…www.w3.org/2000/svg' viewBox='0 0 1... data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23000'%3e%3… — 200 — 0 B — 0 ms — datahttps://tile.openstreetmap.org/5/7/12.pngtile.openstreetmap.org/5/7/12.png https://tile.openstreetmap.org/5/7/12.png — 200 — 19.0 KiB — 55 ms — h2https://tile.openstreetmap.org/5/7/11.pngtile.openstreetmap.org/5/7/11.png https://tile.openstreetmap.org/5/7/11.png — 200 — 19.5 KiB — 28 ms — h2https://tile.openstreetmap.org/5/6/12.pngtile.openstreetmap.org/5/6/12.png https://tile.openstreetmap.org/5/6/12.png — 200 — 19.8 KiB — 57 ms — h2https://tile.openstreetmap.org/5/8/12.pngtile.openstreetmap.org/5/8/12.png https://tile.openstreetmap.org/5/8/12.png — 200 — 27.9 KiB — 46 ms — h2https://tile.openstreetmap.org/5/7/13.pngtile.openstreetmap.org/5/7/13.png https://tile.openstreetmap.org/5/7/13.png — 200 — 14.7 KiB — 31 ms — h2https://tile.openstreetmap.org/5/6/11.pngtile.openstreetmap.org/5/6/11.png https://tile.openstreetmap.org/5/6/11.png — 200 — 11.0 KiB — 47 ms — h2https://tile.openstreetmap.org/5/8/14.pngtile.openstreetmap.org/5/8/14.png https://tile.openstreetmap.org/5/8/14.png — 200 — 19.4 KiB — 54 ms — h2https://tile.openstreetmap.org/5/5/12.pngtile.openstreetmap.org/5/5/12.png https://tile.openstreetmap.org/5/5/12.png — 200 — 24.5 KiB — 52 ms — h2https://tile.openstreetmap.org/5/10/14.pngtile.openstreetmap.org/5/10/14.png https://tile.openstreetmap.org/5/10/14.png — 200 — 9.9 KiB — 40 ms — h2https://tile.openstreetmap.org/5/8/11.pngtile.openstreetmap.org/5/8/11.png https://tile.openstreetmap.org/5/8/11.png — 200 — 33.5 KiB — 52 ms — h2https://tile.openstreetmap.org/5/6/13.pngtile.openstreetmap.org/5/6/13.png https://tile.openstreetmap.org/5/6/13.png — 200 — 16.6 KiB — 75 ms — h2https://tile.openstreetmap.org/5/8/13.pngtile.openstreetmap.org/5/8/13.png https://tile.openstreetmap.org/5/8/13.png — 200 — 18.0 KiB — 76 ms — h2https://tile.openstreetmap.org/5/7/10.pngtile.openstreetmap.org/5/7/10.png https://tile.openstreetmap.org/5/7/10.png — 200 — 30.2 KiB — 77 ms — h2https://tile.openstreetmap.org/5/9/12.pngtile.openstreetmap.org/5/9/12.png https://tile.openstreetmap.org/5/9/12.png — 200 — 13.3 KiB — 45 ms — h2https://tile.openstreetmap.org/5/7/14.pngtile.openstreetmap.org/5/7/14.png https://tile.openstreetmap.org/5/7/14.png — 200 — 16.5 KiB — 64 ms — h2https://tile.openstreetmap.org/5/6/10.pngtile.openstreetmap.org/5/6/10.png https://tile.openstreetmap.org/5/6/10.png — 200 — 22.5 KiB — 64 ms — h2https://tile.openstreetmap.org/5/8/10.pngtile.openstreetmap.org/5/8/10.png https://tile.openstreetmap.org/5/8/10.png — 200 — 20.5 KiB — 68 ms — h2https://tile.openstreetmap.org/5/5/11.pngtile.openstreetmap.org/5/5/11.png https://tile.openstreetmap.org/5/5/11.png — 200 — 23.9 KiB — 68 ms — h2https://tile.openstreetmap.org/5/9/11.pngtile.openstreetmap.org/5/9/11.png https://tile.openstreetmap.org/5/9/11.png — 200 — 38.0 KiB — 68 ms — h2https://tile.openstreetmap.org/5/5/13.pngtile.openstreetmap.org/5/5/13.png https://tile.openstreetmap.org/5/5/13.png — 200 — 5.7 KiB — 64 ms — h2https://tile.openstreetmap.org/5/9/13.pngtile.openstreetmap.org/5/9/13.png https://tile.openstreetmap.org/5/9/13.png — 200 — 5.3 KiB — 64 ms — h2https://tile.openstreetmap.org/5/6/14.pngtile.openstreetmap.org/5/6/14.png https://tile.openstreetmap.org/5/6/14.png — 200 — 6.6 KiB — 68 ms — h2https://tile.openstreetmap.org/5/5/10.pngtile.openstreetmap.org/5/5/10.png https://tile.openstreetmap.org/5/5/10.png — 200 — 40.3 KiB — 73 ms — h2https://tile.openstreetmap.org/5/9/10.pngtile.openstreetmap.org/5/9/10.png https://tile.openstreetmap.org/5/9/10.png — 200 — 25.3 KiB — 74 ms — h2https://tile.openstreetmap.org/5/5/14.pngtile.openstreetmap.org/5/5/14.png https://tile.openstreetmap.org/5/5/14.png — 200 — 795 B — 64 ms — h2https://tile.openstreetmap.org/5/9/14.pngtile.openstreetmap.org/5/9/14.png https://tile.openstreetmap.org/5/9/14.png — 200 — 16.3 KiB — 68 ms — h2https://tile.openstreetmap.org/5/4/12.pngtile.openstreetmap.org/5/4/12.png https://tile.openstreetmap.org/5/4/12.png — 200 — 1.7 KiB — 68 ms — h2https://tile.openstreetmap.org/5/10/12.pngtile.openstreetmap.org/5/10/12.png https://tile.openstreetmap.org/5/10/12.png — 200 — 1.6 KiB — 68 ms — h2https://tile.openstreetmap.org/5/4/11.pngtile.openstreetmap.org/5/4/11.png https://tile.openstreetmap.org/5/4/11.png — 200 — 4.2 KiB — 69 ms — h2https://tile.openstreetmap.org/5/10/11.pngtile.openstreetmap.org/5/10/11.png https://tile.openstreetmap.org/5/10/11.png — 200 — 16.6 KiB — 74 ms — h2https://tile.openstreetmap.org/5/4/13.pngtile.openstreetmap.org/5/4/13.png https://tile.openstreetmap.org/5/4/13.png — 200 — 321 B — 69 ms — h2https://tile.openstreetmap.org/5/10/13.pngtile.openstreetmap.org/5/10/13.png https://tile.openstreetmap.org/5/10/13.png — 200 — 325 B — 70 ms — h2https://tile.openstreetmap.org/5/4/10.pngtile.openstreetmap.org/5/4/10.png https://tile.openstreetmap.org/5/4/10.png — 200 — 29.7 KiB — 74 ms — h2https://tile.openstreetmap.org/5/10/10.pngtile.openstreetmap.org/5/10/10.png https://tile.openstreetmap.org/5/10/10.png — 200 — 20.9 KiB — 75 ms — h2https://tile.openstreetmap.org/5/4/14.pngtile.openstreetmap.org/5/4/14.png https://tile.openstreetmap.org/5/4/14.png — 200 — 540 B — 74 ms — h2https://matomo.openstreetmap.org/matomo.php?action_name=OpenStreetMap&idsite=1&rec=1&r=799852&h=18&m=16&s=23&url=https%3A%2F%2Fwww.openstreetmap.org%2F%23map%3D5%2F38.01%2F-95.84&_id=8651df7ed9630f28&_idn=1&send_image=0&_refts=0&pv_id=pAk2AB&webgl=1&pf_net=0&pf_srv=314&pf_tfr=2&pf_dm1=280&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224.0.0.0%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146.0.7680.164%22%7D%5D%2C%22mobile%22%3Afalse%2C%22model%22%3A%22%22%2C%22platform%22%3A%22macOS%22%2C%22platformVersion%22%3A%2210.15.7%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=800x600matomo.openstreetmap.org/matomo.php... https://matomo.openstreetmap.org/matomo.php?action_name=OpenStreetMap&idsite=1&rec=1&r=799852&h=18&m=16&s=23&url=https%3A%2F%2Fwww.openstreetmap.org%2F%23map%3D5%2F38.01%2F-95.84&_id=8651df7ed9630f28&_idn=1&send_image=0&_refts=0&pv_id=pAk2AB&webgl=1&pf_net=0&pf_srv=314&pf_tfr=2&pf_dm1=280&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224.0.0.0%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146.0.7680.164%22%7D%5D%2C%22mobile%22%3Afalse%2C%22model%22%3A%22%22%2C%22platform%22%3A%22macOS%22%2C%22platformVersion%22%3A%2210.15.7%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=800x600 — 204 — 64 B — 128 ms — h2https://www.openstreetmap.org/assets/favicon-32x32-99b88fcadeef736889823c8a886b89d8cada9d4423a49a27de29bacc0a6bebd1.pngwww.openstreetmap.org/assets/favico... https://www.openstreetmap.org/assets/favicon-32x32-99b88fcadeef736889823c8a886b89d8cada9d4423a49a27de29bacc0a6bebd1.png — 200 — 2.9 KiB — 9 ms — h3https://www.openstreetmap.org/assets/android-chrome-144x144-1ca102662af5366ff980871b959678d7ff7377cd9093cb0431dabb6c6010b723.pngwww.openstreetmap.org/assets/androi... https://www.openstreetmap.org/assets/android-chrome-144x144-1ca102662af5366ff980871b959678d7ff7377cd9093cb0431dabb6c6010b723.png — 200 — 28.4 KiB — 8 ms — h3https://matomo.openstreetmap.org/matomo.php?idgoal=3&idsite=1&rec=1&r=556090&h=18&m=16&s=23&url=https%3A%2F%2Fwww.openstreetmap.org%2F%23map%3D5%2F38.01%2F-95.84&_id=8651df7ed9630f28&_idn=0&send_image=0&_refts=0&pv_id=pAk2AB&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224.0.0.0%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146.0.7680.164%22%7D%5D%2C%22mobile%22%3Afalse%2C%22model%22%3A%22%22%2C%22platform%22%3A%22macOS%22%2C%22platformVersion%22%3A%2210.15.7%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=800x600matomo.openstreetmap.org/matomo.php... https://matomo.openstreetmap.org/matomo.php?idgoal=3&idsite=1&rec=1&r=556090&h=18&m=16&s=23&url=https%3A%2F%2Fwww.openstreetmap.org%2F%23map%3D5%2F38.01%2F-95.84&_id=8651df7ed9630f28&_idn=0&send_image=0&_refts=0&pv_id=pAk2AB&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224.0.0.0%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146.0.7680.164%22%7D%5D%2C%22mobile%22%3Afalse%2C%22model%22%3A%22%22%2C%22platform%22%3A%22macOS%22%2C%22platformVersion%22%3A%2210.15.7%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=800x600 — 204 — 38 B — 170 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 485ms · 534KB · $6/mo
www.openstreetmap.org
Other
Costly
Execution 248ms
Transfer 490 KB
Unused 65%
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 128ms
Transfer 0 KB
Monthly Cost $2/mo
www.openstreetmap.org
Other
Optional
Execution 54ms
Transfer 35 KB
Unused 84%
Monthly Cost $1/mo
www.openstreetmap.org
Other
Optional
Execution 54ms
Transfer 8 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.openstreetmap.org adds 248ms 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.openstreetmap.org takes 248ms 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.org'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

84% of www.openstreetmap.org'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.

Send Feedback