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https://tagesschau.de

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

94
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

657 ms

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

1.49 s

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

24 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.

1.22 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.

2.12 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 4 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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
30 scripts, 436 KB unused
FIX
30 scripts, 436 KB unused
Warning::
https://player.h-cdn.com/loader.js?customer=ard_de...: 169 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.tagesschau.de/resources/assets/9860-04...: 156 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.tagesschau.de/resources/assets/modern-...: 88 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.tagesschau.de/resources/assets/8354-f0...: 22 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 436 KB
436 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://player.h-cdn.com/loader.js?customer=ard_de&no_conf=true&md5=933738-0acf1ad1244 KB169 KB (70%)3rd
https://www.tagesschau.de/resources/assets/9860-04797034dec49ec10d84.chunk.bundle.js255 KB156 KB (61%)3rd
https://www.tagesschau.de/resources/assets/modern-20c517e20810c30c1af7.bundle.js176 KB88 KB (50%)3rd
https://www.tagesschau.de/resources/assets/8354-f0ee7055d7d9e2ac857f.chunk.bundle.js28 KB22 KB (80%)3rd
https://www.tagesschau.de/resources/assets/8953-cf738b89233a310b4e23.chunk.bundle.js2 KB3rd
https://www.tagesschau.de/resources/assets/4812-0abfdc3d9a383d3baaca.chunk.bundle.js8 KB3rd
https://www.tagesschau.de/resources/assets/5778-1035c48dfbff11a45f47.chunk.bundle.js2 KB3rd
https://www.tagesschau.de/resources/assets/2164-8d4cece496f91f0fddc9.chunk.bundle.js2 KB3rd
https://www.tagesschau.de/resources/assets/4050-7224dc61b031deda6400.chunk.bundle.js5 KB3rd
https://www.tagesschau.de/resources/assets/6163-84d0ae7ea8baee3a9502.chunk.bundle.js4 KB3rd

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
65 resources · 1.9 MB · 436 KB savings available
FIX
65 resources · 1.9 MB · 436 KB savings available
Warning::
Page weight 958 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~436 KB of savings available
Warning::
64 third-party resources (100% of weight)
Info::
2 resources over 200KB
65 resources · 1.9 MiB · 64 third-party 957.8 KiB over 1MB target
JavaScript 43% · 843.5 KiB
Font 24% · 476.9 KiB
Image 23% · 453.0 KiB
Document 7% · 129.1 KiB
CSS 4% · 75.0 KiB
Other 0% · 4.3 KiB

~436.0 KiB of savings available

Remove unused JavaScript: 436.0 KiB
C
Page Weight Budget
Action
1.9 MB transferred, 65 requests
REVIEW
1.9 MB transferred, 65 requests
Info::
Page weighs 6.6 MB (1.9 MB transferred)
Warning::
JavaScript is 844 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 844 KB
Info::
Fonts are 477 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 477 KB
Info::
65 HTTP requests
Info::
Estimated 0.41 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
65 requests
0.41 g CO2 per page load
JavaScript 843.5 KiB 43%
Fonts 476.9 KiB 24%
Images 411.1 KiB 21%
HTML 127.9 KiB 6%
CSS 75.0 KiB 4%
Other 42.0 KiB 2%
Other 4.0 KiB 0%
Other 1.0 KiB 0%
Other 329 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

C
Image Optimization
Action
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://images.tagesschau.de/image/ad903341-f090-4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.tagesschau.de/image/427ae66c-a579-4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.tagesschau.de/image/b70e1062-6b31-4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.tagesschau.de/image/9a300bab-f924-4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.tagesschau.de/image/a75a83d7-20e4-4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.tagesschau.de/image/35510126-b002-4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.tagesschau.de/image/b24e1af8-b729-4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.tagesschau.de/image/500bafa6-a89b-4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 411 KB
0 oversized -0 KB
10 legacy format
9 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

Performance issues directly impact user engagement and conversion rates.

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
1306ms total JS execution
REVIEW
1306ms total JS execution
Warning::
https://www.tagesschau.de/resources/assets/modern-...: 512ms CPU time
Warning::
https://www.tagesschau.de/: 269ms CPU time
Info::
Unattributable: 215ms CPU time
Info::
https://player.h-cdn.com/loader.js?customer=ard_de...: 209ms CPU time
Info::
https://www.tagesschau.de/resources/assets/9860-04...: 100ms CPU time
Warning::
Third-party scripts: 1306ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 22% Style & Layout 16% Script Parsing & Compilation 5% Rendering 4% Garbage Collection 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.tagesschau.de/resources/assets/modern-20c517e20810c30c1af7.bundle.js512ms349ms12ms3rd
https://www.tagesschau.de/269ms3ms0ms3rd
Unattributable215ms3ms0ms3rd
https://player.h-cdn.com/loader.js?customer=ard_de&no_conf=true&md5=933738-0acf1ad1209ms170ms18ms3rd
https://www.tagesschau.de/resources/assets/9860-04797034dec49ec10d84.chunk.bundle.js100ms66ms29ms3rd
B
HTTP Caching
private
REVIEW
private
Info::
Cache-Control header is set
Got: private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private

DirectiveValueMeaning
privateOnly browser cache, not CDN/proxy
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
6 fonts (477 KB)
PASS
6 fonts (477 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

477 KB total

Render-blocking

0

of 6

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 657 ms LCP 1.5 shttps://www.tagesschau.de/resources/assets/fonts/TheSansC5s-4_SemiLight.woff2TheSansC5s-4_SemiLight.... https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-4_SemiLight.woff2 — 113.2 KiB — 24 ms — font-display: swaphttps://www.tagesschau.de/resources/assets/fonts/TheSansC5s-6_SemiBold.woff2TheSansC5s-6_SemiBold.w... https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-6_SemiBold.woff2 — 113.8 KiB — 26 ms — font-display: swaphttps://www.tagesschau.de/resources/assets/fonts/TheSansC5s-4_SemiLightItalic.woff2TheSansC5s-4_SemiLightI... https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-4_SemiLightItalic.woff2 — 117.9 KiB — 26 ms — font-display: swaphttps://www.tagesschau.de/resources/assets/fonts/TheSansC5s-6_SemiBoldItalic.woff2TheSansC5s-6_SemiBoldIt... https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-6_SemiBoldItalic.woff2 — 118.8 KiB — 22 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 — 18 ms — font-display: swaphttps://www.tagesschau.de/resources/assets/css/assets/9ae5a60f8f99358b3179-ardplayer.woff29ae5a60f8f99358b3179-ar... https://www.tagesschau.de/resources/assets/css/assets/9ae5a60f8f99358b3179-ardplayer.woff2 — 11.5 KiB — 8 ms — font-display: swap
TheSansC5s-4_SemiLight.... woff2 swap
Size 113 KB
Load time 24 ms
Start 121 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
TheSansC5s-6_SemiBold.w... woff2 swap
Size 114 KB
Load time 26 ms
Start 121 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
TheSansC5s-4_SemiLightI... woff2 swap
Size 118 KB
Load time 26 ms
Start 122 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
TheSansC5s-6_SemiBoldIt... woff2 swap
Size 119 KB
Load time 22 ms
Start 122 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
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 18 ms
Start 534 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
9ae5a60f8f99358b3179-ar... woff2 swap
Size 12 KB
Load time 8 ms
Start 881 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)

Fixing the unchecked items could save ~232 KB and ~464 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: Google Cloud

Network Waterfall
65 requests over 15566ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 657 ms LCP 1.5 shttps://tagesschau.de// https://tagesschau.de/ — 308 — 140 B — 59 ms — h2https://www.tagesschau.de/www.tagesschau.de/ https://www.tagesschau.de/ — 200 — 127.9 KiB — 58 ms — h2https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-4_SemiLight.woff2www.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-4_SemiLight.woff2 — 200 — 113.2 KiB — 24 ms — h2https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-6_SemiBold.woff2www.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-6_SemiBold.woff2 — 200 — 113.8 KiB — 26 ms — h2https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-4_SemiLightItalic.woff2www.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-4_SemiLightItalic.woff2 — 200 — 117.9 KiB — 26 ms — h2https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-6_SemiBoldItalic.woff2www.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/fonts/TheSansC5s-6_SemiBoldItalic.woff2 — 200 — 118.8 KiB — 22 ms — h2https://www.tagesschau.de/resources/assets/css/main-3754c478184023a8a18b.csswww.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/css/main-3754c478184023a8a18b.css — 200 — 73.8 KiB — 16 ms — h2https://www.tagesschau.de/resources/assets/js/ts/smartbanner/smartbanner.min.jswww.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/js/ts/smartbanner/smartbanner.min.js — 200 — 3.1 KiB — 14 ms — h2https://www.tagesschau.de/resources/assets/js/ts/smartbanner/smartbanner.min.csswww.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/js/ts/smartbanner/smartbanner.min.css — 200 — 1.2 KiB — 19 ms — h2https://images.tagesschau.de/image/500bafa6-a89b-486b-8430-4483869f0d0a/AAABnZIYz50/AAABnSSvdEs/16x7/fico-babis-102.webp?width=1280images.tagesschau.de/image/500bafa6... https://images.tagesschau.de/image/500bafa6-a89b-486b-8430-4483869f0d0a/AAABnZIYz50/AAABnSSvdEs/16x7/fico-babis-102.webp?width=1280 — 200 — 55.8 KiB — 7 ms — h2https://www.tagesschau.de/resources/assets/modern-20c517e20810c30c1af7.bundle.jswww.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/modern-20c517e20810c30c1af7.bundle.js — 200 — 175.8 KiB — 15 ms — h2https://player.h-cdn.com/loader.js?customer=ard_deplayer.h-cdn.com/loader.js?customer... https://player.h-cdn.com/loader.js?customer=ard_de — 200 — 4.7 KiB — 80 ms — h2https://www.tagesschau.de/resources/assets/icon/ts_watermark_white.svgwww.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/icon/ts_watermark_white.svg — 200 — 6.8 KiB — 30 ms — h2https://www.tagesschau.de/resources/assets/icon/timeline-icon--fill-black.svgwww.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/icon/timeline-icon--fill-black.svg — 200 — 387 B — 21 ms — h2https://www.tagesschau.de/resources/assets/icon/icon-ard-external-link--fill-emotional-100.svgwww.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/icon/icon-ard-external-link--fill-emotional-100.svg — 200 — 936 B — 7 ms — h2https://images.tagesschau.de/image/9a300bab-f924-4213-b43e-ea07aff3d0b2/AAABnZIZo1w/AAABnSSvdEs/16x7/klingbeil-324.webp?width=1280images.tagesschau.de/image/9a300bab... https://images.tagesschau.de/image/9a300bab-f924-4213-b43e-ea07aff3d0b2/AAABnZIZo1w/AAABnSSvdEs/16x7/klingbeil-324.webp?width=1280 — 200 — 14.4 KiB — 10 ms — h2https://images.tagesschau.de/image/ad903341-f090-404b-bc8a-178698261126/AAABnZGWLJ4/AAABnSSvrFg/16x9-big/zapfpistole-106.webp?width=768images.tagesschau.de/image/ad903341... https://images.tagesschau.de/image/ad903341-f090-404b-bc8a-178698261126/AAABnZGWLJ4/AAABnSSvrFg/16x9-big/zapfpistole-106.webp?width=768 — 200 — 27.2 KiB — 11 ms — h2https://images.tagesschau.de/image/35510126-b002-452b-a4f9-7f6b870152fc/AAABldr9Jik/AAABnSSvsdE/16x9-small/klimachronik-ts-100.webp?width=384images.tagesschau.de/image/35510126... https://images.tagesschau.de/image/35510126-b002-452b-a4f9-7f6b870152fc/AAABldr9Jik/AAABnSSvsdE/16x9-small/klimachronik-ts-100.webp?width=384 — 200 — 5.5 KiB — 11 ms — h2https://images.tagesschau.de/image/b24e1af8-b729-4a38-a0e5-b056bd14b7f9/AAABnZB1t6U/AAABnSSvrFg/16x9-big/singapur-222.webp?width=768images.tagesschau.de/image/b24e1af8... https://images.tagesschau.de/image/b24e1af8-b729-4a38-a0e5-b056bd14b7f9/AAABnZB1t6U/AAABnSSvrFg/16x9-big/singapur-222.webp?width=768 — 200 — 39.2 KiB — 8 ms — 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ms — h2https://www.tagesschau.de/resources/assets/image/favicon/favicon.svgwww.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/image/favicon/favicon.svg — 200 — 30.9 KiB — 35 ms — h2https://www.tagesschau.de/resources/assets/image/favicon/favicon.icowww.tagesschau.de/resources/assets/... https://www.tagesschau.de/resources/assets/image/favicon/favicon.ico — 200 — 11.0 KiB — 41 ms — h2https://player.h-cdn.com/loader.js?customer=ard_de&no_conf=true&md5=933738-0acf1ad1player.h-cdn.com/loader.js?customer... https://player.h-cdn.com/loader.js?customer=ard_de&no_conf=true&md5=933738-0acf1ad1 — 200 — 243.9 KiB — 110 ms — h2https://player.h-cdn.com/config.js?customer=ard_de&md5=62639-55349260player.h-cdn.com/config.js?customer... https://player.h-cdn.com/config.js?customer=ard_de&md5=62639-55349260 — 200 — 11.3 KiB — 97 ms — h2https://zagent7.h-cdn.com/cmd/get_links_info?customer=ard_de&zone=gen&ver=1.165.211&url=https%3A%2F%2Fwww.tagesschau.de%2Fzagent7.h-cdn.com/cmd/get_links_inf... https://zagent7.h-cdn.com/cmd/get_links_info?customer=ard_de&zone=gen&ver=1.165.211&url=https%3A%2F%2Fwww.tagesschau.de%2F — 200 — 1.0 KiB — 84 ms — http/1.1https://perr.h-cdn.com/be_client_cgi/perr?id=www_cdn_db_spark_stats&browser=chrome&browser_ver=147&customer=ard_de&tag_id=4035&tag_date=1775747725174perr.h-cdn.com/be_client_cgi/perr?i... https://perr.h-cdn.com/be_client_cgi/perr?id=www_cdn_db_spark_stats&browser=chrome&browser_ver=147&customer=ard_de&tag_id=4035&tag_date=1775747725174 — 200 — 0 B — 298 ms — http/1.1
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 1306ms · 802KB · €14/mo
www.tagesschau.de
Other
Costly
Execution 512ms
Transfer 176 KB
Unused 50%
Monthly Cost €6/mo
www.tagesschau.de
Other
Costly
Execution 269ms
Transfer 128 KB
Monthly Cost €3/mo
Unattributable
Other
Costly
Execution 215ms
Transfer 0 KB
Monthly Cost €2/mo
player.h-cdn.com
Other
Costly
Execution 209ms
Transfer 244 KB
Unused 70%
Monthly Cost €2/mo
www.tagesschau.de
Other
Optional
Execution 100ms
Transfer 255 KB
Unused 61%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.tagesschau.de adds 512ms and costs ~€6/month
  • www.tagesschau.de adds 269ms and costs ~€3/month
  • Unattributable adds 215ms and costs ~€2/month
  • player.h-cdn.com adds 209ms and costs ~€2/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.tagesschau.de takes 512ms 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

50% of www.tagesschau.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

www.tagesschau.de takes 269ms 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 215ms 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

player.h-cdn.com takes 209ms 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

70% of player.h-cdn.com'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

61% of www.tagesschau.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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