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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
3
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.
85
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.

3.45 s

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

4.28 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.

0.285

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

4.78 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.

4.32 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 5 REVIEW 3 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 (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
51 resources · 1.6 MB · 121 KB savings available
FIX
51 resources · 1.6 MB · 121 KB savings available
Warning::
Page weight 614 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~121 KB of savings available
Warning::
50 third-party resources (100% of weight)
51 resources · 1.6 MiB · 50 third-party 614.2 KiB over 1MB target
Image 75% · 1.2 MiB
JavaScript 14% · 223.0 KiB
Font 6% · 91.6 KiB
CSS 5% · 88.8 KiB
Document 1% · 9.2 KiB
Other 0% · 672 B

~121.3 KiB of savings available

Remove unused JavaScript: 121.3 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Page Weight Budget
Action
1.6 MB transferred, 51 requests
REVIEW
1.6 MB transferred, 51 requests
Info::
Page weighs 2.6 MB (1.6 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Info::
51 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
51 requests
0.34 g CO2 per page load
Images 1.2 MiB 74%
JavaScript 223.0 KiB 14%
Fonts 91.6 KiB 6%
CSS 88.8 KiB 5%
Other 8.5 KiB 1%
HTML 8.0 KiB 0%
Other 1.2 KiB 0%
Other 447 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

C
Image Optimization
Action
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/css/berlin_de/foxtrot/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/css/berlin_de/foxtrot/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berlin.de/binaries/asset/image_assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
27 images 1.2 MB
0 oversized -0 KB
13 legacy format
15 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

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

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
JS Execution Cost
Action
1372ms total JS execution
REVIEW
1372ms total JS execution
Warning::
Unattributable: 464ms CPU time
Warning::
https://www.berlin.de/: 395ms CPU time
Info::
https://www.berlin.de/css/berlin_de/foxtrot/bundle...: 192ms CPU time
Info::
https://www.berlin.de/-wt-safetag.js: 116ms CPU time
Info::
https://www.berlin.de/css/berlin_de/foxtrot/bundle...: 110ms CPU time
Warning::
Third-party scripts: 1372ms (100% of total)

Main Thread Breakdown

Other 34% Style & Layout 32% Script Evaluation 23% Script Parsing & Compilation 4% Rendering 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable464ms6ms0ms3rd
https://www.berlin.de/395ms6ms2ms3rd
https://www.berlin.de/css/berlin_de/foxtrot/bundle/berlin_organization.js?1776618899192ms82ms17ms3rd
https://www.berlin.de/-wt-safetag.js116ms92ms10ms3rd
https://www.berlin.de/css/berlin_de/foxtrot/bundle/swiper.chunk.js110ms63ms13ms3rd
https://www.berlin.de/css/berlin_de/foxtrot/bundle/portal.js?177661889995ms69ms20ms3rd
B
JS Bundles
6 scripts, 121 KB unused
REVIEW
6 scripts, 121 KB unused
Warning::
https://www.berlin.de/css/berlin_de/foxtrot/bundle...: 53 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.berlin.de/css/berlin_de/foxtrot/bundle...: 42 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.berlin.de/css/berlin_de/foxtrot/bundle...: 26 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 121 KB
121 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.berlin.de/css/berlin_de/foxtrot/bundle/portal.js?177661889978 KB53 KB (69%)✓3rd
https://www.berlin.de/css/berlin_de/foxtrot/bundle/berlin_organization.js?177661889966 KB42 KB (64%)✓3rd
https://www.berlin.de/css/berlin_de/foxtrot/bundle/swiper.chunk.js40 KB26 KB (64%)✓3rd
https://www.berlin.de/-wt-safetag.js38 KB—✓3rd
https://www.berlin.de/css/berlin_de/foxtrot/bundle/fontawesome.chunk.js0 KB—✓3rd
https://www.berlin.de/css/berlin_de/foxtrot/bundle/swipercss.chunk.js0 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+
Font Loading
3 fonts (92 KB)
PASS
3 fonts (92 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

92 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 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.5 s LCP 4.3 shttps://www.berlin.de/css/berlin_de/foxtrot/bundle/1551f4f60c37af51121f.woff21551f4f60c37af51121f.woff2 https://www.berlin.de/css/berlin_de/foxtrot/bundle/1551f4f60c37af51121f.woff2 — 76.9 KiB — 42 ms — font-display: swaphttps://www.berlin.de/css/berlin_de/foxtrot/bundle/7a3337626410ca2f4071.woff27a3337626410ca2f4071.woff2 https://www.berlin.de/css/berlin_de/foxtrot/bundle/7a3337626410ca2f4071.woff2 — 13.1 KiB — 40 ms — font-display: swapdata:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 1.6 KiB — 4 ms — font-display: swap
1551f4f60c37af51121f.woff2 woff2 swap
Size 77 KB
Load time 42 ms
Start 524 ms
Risk FOUT — text flashes from fallback to web font
7a3337626410ca2f4071.woff2 woff2 swap
Size 13 KB
Load time 40 ms
Start 525 ms
Risk FOUT — text flashes from fallback to web font
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 4 ms
Start 577 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
51 requests over 1660ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.5 s LCP 4.3 shttps://berlin.de// https://berlin.de/ — 308 — 225 B — 113 ms — h2https://www.berlin.de/www.berlin.de/ https://www.berlin.de/ — 200 — 8.0 KiB — 45 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/berlin_organization.css?_ts=1776618899www.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/berlin_organization.css?_ts=1776618899 — 200 — 52.3 KiB — 140 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/portal.css?_ts=1776618899www.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/portal.css?_ts=1776618899 — 200 — 17.8 KiB — 109 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/images/logo_berlin_m_srgb.svgwww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/images/logo_berlin_m_srgb.svg — 200 — 4.3 KiB — 42 ms — h2https://www.berlin.de/binaries/link/file/1774450104/10282930.svgwww.berlin.de/binaries/link/file/17... https://www.berlin.de/binaries/link/file/1774450104/10282930.svg — 200 — 14.5 KiB — 76 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/images/logo_berlin_m_negativ.svgwww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/images/logo_berlin_m_negativ.svg — 200 — 4.3 KiB — 97 ms — h2https://www.berlin.de/favicon/manifest.jsonwww.berlin.de/favicon/manifest.json https://www.berlin.de/favicon/manifest.json — 200 — 447 B — 111 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/berlin_organization.js?1776618899www.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/berlin_organization.js?1776618899 — 200 — 66.2 KiB — 124 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/portal.js?1776618899www.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/portal.js?1776618899 — 200 — 77.8 KiB — 74 ms — h2data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22…data:image/svg+xml;utf8,%3Csvg%20xm... data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22…data:image/svg+xml;utf8,%3Csvg%20xm... data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22…data:image/svg+xml;utf8,%3Csvg%20xm... data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22…data:image/svg+xml;utf8,%3Csvg%20xm... data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22…data:image/svg+xml;utf8,%3Csvg%20xm... data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22… — 200 — 0 B — 0 ms — datahttps://www.berlin.de/css/berlin_de/foxtrot/bundle/6ff7d119d7b13fa655ed.svgwww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/6ff7d119d7b13fa655ed.svg — 200 — 443 B — 92 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/0d62483196704ba4c326.svgwww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/0d62483196704ba4c326.svg — 200 — 364 B — 99 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/a67116019d3be6e37c85.svgwww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/a67116019d3be6e37c85.svg — 200 — 421 B — 96 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/85159f0aa30425cba5c5.svgwww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/85159f0aa30425cba5c5.svg — 200 — 688 B — 95 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/bb724a1cc44676491342.svgwww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/bb724a1cc44676491342.svg — 200 — 533 B — 94 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/03b5e940a0673a29a2d1.svgwww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/03b5e940a0673a29a2d1.svg — 200 — 386 B — 92 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/2fca1f0cec8993b8d3a3.svgwww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/2fca1f0cec8993b8d3a3.svg — 200 — 565 B — 103 ms — h2data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22…data:image/svg+xml;utf8,%3Csvg%20xm... data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%22… — 200 — 0 B — 0 ms — datahttps://www.berlin.de/css/berlin_de/foxtrot/bundle/8d7e4d41d09e69e1e328.svgwww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/8d7e4d41d09e69e1e328.svg — 200 — 522 B — 95 ms — h2https://www.berlin.de/-wt-safetag.jswww.berlin.de/-wt-safetag.js https://www.berlin.de/-wt-safetag.js — 200 — 38.4 KiB — 47 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/2047.chunk.csswww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/2047.chunk.css — 200 — 13.3 KiB — 45 ms — h2https://www.berlin.de/css/berlin_de/foxtrot/bundle/fontawesome.chunk.jswww.berlin.de/css/berlin_de/foxtrot... https://www.berlin.de/css/berlin_de/foxtrot/bundle/fontawesome.chunk.js — 200 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— h2https://www.berlin.de/binaries/asset/image_assets/7103866/ratio_4_3/1668410283/800x600/www.berlin.de/binaries/asset/image_... https://www.berlin.de/binaries/asset/image_assets/7103866/ratio_4_3/1668410283/800x600/ — 200 — 157.3 KiB — 346 ms — h2https://www.berlin.de/binaries/asset/image_assets/10297021/ratio_4_3/1775034254/800x600/www.berlin.de/binaries/asset/image_... https://www.berlin.de/binaries/asset/image_assets/10297021/ratio_4_3/1775034254/800x600/ — 200 — 18.4 KiB — 115 ms — h2https://www.berlin.de/binaries/asset/image_assets/10272958/ratio_4_3/1773932395/800x600/www.berlin.de/binaries/asset/image_... https://www.berlin.de/binaries/asset/image_assets/10272958/ratio_4_3/1773932395/800x600/ — 200 — 116.6 KiB — 335 ms — h2https://www.berlin.de/binaries/asset/image_assets/10272949/ratio_4_3/1773932159/800x600/www.berlin.de/binaries/asset/image_... https://www.berlin.de/binaries/asset/image_assets/10272949/ratio_4_3/1773932159/800x600/ — 200 — 62.8 KiB — 247 ms — h2https://www.berlin.de/binaries/asset/image_assets/10251184/ratio_4_3/1773033398/800x600/www.berlin.de/binaries/asset/image_... https://www.berlin.de/binaries/asset/image_assets/10251184/ratio_4_3/1773033398/800x600/ — 200 — 107.3 KiB — 314 ms — h2https://www.berlin.de/binaries/asset/image_assets/10242412/ratio_4_3/1772638804/800x600/www.berlin.de/binaries/asset/image_... https://www.berlin.de/binaries/asset/image_assets/10242412/ratio_4_3/1772638804/800x600/ — 200 — 68.2 KiB — 248 ms — h2https://www.berlin.de/binaries/asset/image_assets/10170166/ratio_4_3/1773048383/800x600/www.berlin.de/binaries/asset/image_... https://www.berlin.de/binaries/asset/image_assets/10170166/ratio_4_3/1773048383/800x600/ — 200 — 53.3 KiB — 214 ms — h2https://www.berlin.de/binaries/asset/image_assets/6643159/ratio_4_3/1641565285/800x600/www.berlin.de/binaries/asset/image_... https://www.berlin.de/binaries/asset/image_assets/6643159/ratio_4_3/1641565285/800x600/ — 200 — 83.1 KiB — 280 ms — h2https://www.berlin.de/binaries/asset/image_assets/7732851/ratio_4_3/1776410119/800x600/www.berlin.de/binaries/asset/image_... https://www.berlin.de/binaries/asset/image_assets/7732851/ratio_4_3/1776410119/800x600/ — 200 — 88.2 KiB — 311 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 1372ms · 231KB · €15/mo
Unattributable
Other
Costly
Execution 464ms
Transfer 0 KB
Monthly Cost €5/mo
www.berlin.de
Other
Costly
Execution 395ms
Transfer 8 KB
Monthly Cost €4/mo
www.berlin.de
Other
Optional
Execution 192ms
Transfer 66 KB
Unused 64%
Monthly Cost €2/mo
www.berlin.de
Other
Optional
Execution 116ms
Transfer 38 KB
Monthly Cost €1/mo
www.berlin.de
Other
Optional
Execution 110ms
Transfer 40 KB
Unused 64%
Monthly Cost €1/mo
www.berlin.de
Other
Optional
Execution 95ms
Transfer 78 KB
Unused 69%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 464ms and costs ~€5/month
  • www.berlin.de adds 395ms and costs ~€4/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

Unattributable takes 464ms 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.berlin.de takes 395ms 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

64% of www.berlin.de'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

64% of www.berlin.de'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

69% of www.berlin.de'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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