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https://niedersachsen.de

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
64
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.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
77
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.

843 ms

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

2.20 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.

0.438

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

2.10 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.

2.20 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
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
6.6 MB transferred, 74 requests
FIX
6.6 MB transferred, 74 requests
Critical::
Page weighs 6.6 MB (6.6 MB transferred)
Warning::
Images are 5.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.4 MB
Warning::
JavaScript is 949 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 949 KB
Info::
74 HTTP requests
Info::
Estimated 1.4 g CO2 per page load
6.6 MB / 2.4 MB budget
6.6 MB transferred
74 requests
1.4 g CO2 per page load
Images 5.4 MiB 82%
JavaScript 948.6 KiB 14%
HTML 120.0 KiB 2%
CSS 116.7 KiB 2%
Fonts 38.7 KiB 1%
Other 1.3 KiB 0%
Other 12 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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 (6.6 MiB of 6.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
12 scripts, 673 KB unused
FIX
12 scripts, 673 KB unused
Warning::
https://www.niedersachsen.de/assets/js/video-js-7....: 504 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.niedersachsen.de/assets/js/datatable/d...: 97 KB unused (86%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.niedersachsen.de/piwik.php: 37 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.niedersachsen.de/assets/js/jquery-3.4....: 35 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.niedersachsen.de/assets/js/ds.js?v=158...: unminified — 6 KB could be saved
Info::
Total unused JavaScript: 673 KB
673 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.niedersachsen.de/assets/js/video-js-7.20.1/video.min.js570 KB504 KB (89%)✓3rd
https://www.niedersachsen.de/assets/js/datatable/datatables.min.js114 KB97 KB (86%)✓3rd
https://www.niedersachsen.de/piwik.php65 KB37 KB (58%)✓3rd
https://www.niedersachsen.de/assets/js/jquery-3.4.1.min.js86 KB35 KB (41%)✓3rd
https://www.niedersachsen.de/assets/js/ds.js?v=158375588018 KB—✗3rd
https://www.niedersachsen.de/assets/js/dscontentcarousel.js?ver=160307-14 KB—✓3rd
https://www.niedersachsen.de/assets/js/accessible-slick-1.0.1/slick/slick.min.js43 KB—✓3rd
https://www.niedersachsen.de/assets/js/jquery.rwdImageMaps.min.js1 KB—✓3rd
https://www.niedersachsen.de/assets/js/iframeZoom.js3 KB—✓3rd
https://www.niedersachsen.de/assets/js/tabfocus.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

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
74 resources · 6.6 MB · 673 KB savings available
FIX
74 resources · 6.6 MB · 673 KB savings available
Warning::
Page weight 5.6 MB over 1MB target
Got: 6.6 MB Expected: ≤ 1 MB
Info::
~673 KB of savings available
Warning::
73 third-party resources (100% of weight)
Info::
10 resources over 200KB
74 resources · 6.6 MiB · 73 third-party 5.6 MiB over 1MB target
Image 82% · 5.4 MiB
JavaScript 14% · 948.6 KiB
Document 2% · 120.4 KiB
CSS 2% · 116.7 KiB
Font 1% · 38.7 KiB
Other 0% · 12 B

~672.9 KiB of savings available

Remove unused JavaScript: 672.9 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

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

C
Image Optimization
Action
46 images, 0 KB saveable
REVIEW
46 images, 0 KB saveable
Warning::
https://www.niedersachsen.de/assets/img/klar.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2306... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/250/1821... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2747... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2727... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2186... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/1121... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2541... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/1687... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/250/2669... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2731... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2551... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2738... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2573... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2495... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2721... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2506... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2456... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2173... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2317... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2738... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2259... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/250/2263... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/250/1588... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/250/2143... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/250/1765... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/988/2717... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/250/1821... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/250/1754... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.niedersachsen.de/assets/image/250/1765... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
46 images 5.4 MB
0 oversized -0 KB
45 legacy format
30 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

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
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
434ms total JS execution
PASS
434ms total JS execution
Info::
https://www.niedersachsen.de/assets/js/video-js-7....: 146ms CPU time
Info::
https://www.niedersachsen.de/startseite/: 130ms CPU time
Info::
Unattributable: 87ms CPU time
Info::
https://www.niedersachsen.de/assets/js/jquery-3.4....: 71ms CPU time
Warning::
Third-party scripts: 434ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 30% Style & Layout 14% Rendering 8% Script Parsing & Compilation 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.niedersachsen.de/assets/js/video-js-7.20.1/video.min.js146ms117ms13ms3rd
https://www.niedersachsen.de/startseite/130ms4ms1ms3rd
Unattributable87ms2ms0ms3rd
https://www.niedersachsen.de/assets/js/jquery-3.4.1.min.js71ms45ms2ms3rd
A+
Font Loading
2 fonts (39 KB)
PASS
2 fonts (39 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

39 KB total

Render-blocking

0

of 2

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 2.0 s FCP 843 ms LCP 2.2 shttps://www.niedersachsen.de/assets/fonts/open-sans/open-sans-v18-latin-ext_latin-regular.woff2open-sans-v18-latin-ext... https://www.niedersachsen.de/assets/fonts/open-sans/open-sans-v18-latin-ext_latin-regular.woff2 — 19.0 KiB — 47 ms — font-display: swaphttps://www.niedersachsen.de/assets/fonts/open-sans/open-sans-v18-latin-ext_latin-600.woff2open-sans-v18-latin-ext... https://www.niedersachsen.de/assets/fonts/open-sans/open-sans-v18-latin-ext_latin-600.woff2 — 19.7 KiB — 48 ms — font-display: swap
open-sans-v18-latin-ext... woff2 swap
Size 19 KB
Load time 47 ms
Start 869 ms
Risk FOUT — text flashes from fallback to web font
open-sans-v18-latin-ext... woff2 swap
Size 20 KB
Load time 48 ms
Start 869 ms
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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
74 requests over 4906ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 843 ms LCP 2.2 shttps://niedersachsen.de// https://niedersachsen.de/ — 301 — 191 B — 176 ms — h2https://www.niedersachsen.de/www.niedersachsen.de/ https://www.niedersachsen.de/ — 301 — 192 B — 154 ms — h2https://www.niedersachsen.de/startseite/www.niedersachsen.de/startseite/ https://www.niedersachsen.de/startseite/ — 200 — 120.0 KiB — 444 ms — h2https://www.niedersachsen.de/assets/fonts/open-sans.css?v=1604497169www.niedersachsen.de/assets/fonts/o... https://www.niedersachsen.de/assets/fonts/open-sans.css?v=1604497169 — 200 — 4.6 KiB — 73 ms — h2https://www.niedersachsen.de/assets/js/fancybox/jquery.fancybox.css?v=1471354035www.niedersachsen.de/assets/js/fanc... https://www.niedersachsen.de/assets/js/fancybox/jquery.fancybox.css?v=1471354035 — 200 — 4.8 KiB — 80 ms — h2https://www.niedersachsen.de/assets/js/video-js-7.20.1/video-js.min.css?v=1657706794www.niedersachsen.de/assets/js/vide... https://www.niedersachsen.de/assets/js/video-js-7.20.1/video-js.min.css?v=1657706794 — 200 — 40.2 KiB — 111 ms — h2https://www.niedersachsen.de/assets/css/ds2.css?v=1753091247www.niedersachsen.de/assets/css/ds2... https://www.niedersachsen.de/assets/css/ds2.css?v=1753091247 — 200 — 48.8 KiB — 111 ms — h2https://www.niedersachsen.de/assets/js/accessible-slick-1.0.1/slick/slick.min.css?v=1753091247www.niedersachsen.de/assets/js/acce... https://www.niedersachsen.de/assets/js/accessible-slick-1.0.1/slick/slick.min.css?v=1753091247 — 200 — 1.4 KiB — 74 ms — h2https://www.niedersachsen.de/assets/css/201612.css?v=1486543400www.niedersachsen.de/assets/css/201... https://www.niedersachsen.de/assets/css/201612.css?v=1486543400 — 200 — 780 B — 74 ms — h2https://www.niedersachsen.de/assets/css/cssfixes.css?v=1684828951www.niedersachsen.de/assets/css/css... https://www.niedersachsen.de/assets/css/cssfixes.css?v=1684828951 — 200 — 8.5 KiB — 85 ms — h2https://www.niedersachsen.de/assets/css/cssFaq.css?v=1688453644www.niedersachsen.de/assets/css/css... https://www.niedersachsen.de/assets/css/cssFaq.css?v=1688453644 — 200 — 2.2 KiB — 77 ms — h2https://www.niedersachsen.de/assets/image/97201www.niedersachsen.de/assets/image/9... https://www.niedersachsen.de/assets/image/97201 — 200 — 1.2 KiB — 72 ms — h2https://www.niedersachsen.de/assets/image/99894www.niedersachsen.de/assets/image/9... https://www.niedersachsen.de/assets/image/99894 — 200 — 731 B — 67 ms — h2https://www.niedersachsen.de/assets/image/100095www.niedersachsen.de/assets/image/1... https://www.niedersachsen.de/assets/image/100095 — 200 — 965 B — 72 ms — h2https://www.niedersachsen.de/assets/image/100246www.niedersachsen.de/assets/image/1... https://www.niedersachsen.de/assets/image/100246 — 200 — 730 B — 68 ms — h2https://www.niedersachsen.de/assets/image/100687www.niedersachsen.de/assets/image/1... https://www.niedersachsen.de/assets/image/100687 — 200 — 1.3 KiB — 68 ms — h2https://www.niedersachsen.de/assets/js/jquery-3.4.1.min.jswww.niedersachsen.de/assets/js/jque... https://www.niedersachsen.de/assets/js/jquery-3.4.1.min.js — 200 — 86.3 KiB — 53 ms — h2https://www.niedersachsen.de/assets/img/niedersachsen.pngwww.niedersachsen.de/assets/img/nie... https://www.niedersachsen.de/assets/img/niedersachsen.png — 200 — 5.3 KiB — 49 ms — h2https://www.niedersachsen.de/assets/css/home.gifwww.niedersachsen.de/assets/css/hom... https://www.niedersachsen.de/assets/css/home.gif — 200 — 729 B — 50 ms — h2https://www.niedersachsen.de/assets/image/988/274705www.niedersachsen.de/assets/image/9... https://www.niedersachsen.de/assets/image/988/274705 — 200 — 413.7 KiB — 142 ms — h2https://www.niedersachsen.de/assets/css/pfeilsprite2.pngwww.niedersachsen.de/assets/css/pfe... https://www.niedersachsen.de/assets/css/pfeilsprite2.png — 200 — 7.4 KiB — 56 ms — h2https://www.niedersachsen.de/assets/css/pfeile2.pngwww.niedersachsen.de/assets/css/pfe... 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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 434ms · 776KB · €5/mo
www.niedersachsen.de
Other
Optional
Execution 146ms
Transfer 570 KB
Unused 89%
Monthly Cost €2/mo
www.niedersachsen.de
Other
Optional
Execution 130ms
Transfer 120 KB
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 87ms
Transfer 0 KB
Monthly Cost €1/mo
www.niedersachsen.de
Other
Optional
Execution 71ms
Transfer 86 KB
Unused 41%
Monthly Cost €1/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

89% of www.niedersachsen.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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