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https://heise.de

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
3
REVIEW
2
PASS
10
INFO
2

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

Mobile Desktop
38
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
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.

4.34 s

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

8.90 s

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

1.19 s

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.

6.01 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

9.19 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
10 PASS 2 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 (847.2 KiB of 847.5 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5141ms total JS execution
FIX
5141ms total JS execution
Warning::
https://www.heise.de/: 1208ms CPU time
Warning::
https://cmp.heise.de/Notice.8f529.js: 953ms CPU time
Warning::
https://www.heise.de/assets/akwa/v24/js/akwa.js: 757ms CPU time
Warning::
Unattributable: 738ms CPU time
Warning::
https://cmp.heise.de/unified/wrapperMessagingWitho...: 553ms CPU time
Warning::
Third-party scripts: 5141ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Style & Layout 22% Other 18% Parse HTML & CSS 7% Rendering 5% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.heise.de/1208ms72ms5ms3rd
https://cmp.heise.de/Notice.8f529.js953ms698ms50ms3rd
https://www.heise.de/assets/akwa/v24/js/akwa.js757ms478ms39ms3rd
Unattributable738ms42ms0ms3rd
https://cmp.heise.de/unified/wrapperMessagingWithoutDetection.js553ms183ms18ms3rd
https://responder.wt.heise.de/resp/api/get/288689636920174?url=https%3A%2F%2Fwww.heise.de%2F&v=5485ms409ms25ms3rd
https://cdn.mateti.net/mcp/onsite.min.js176ms157ms14ms3rd
https://xn2wkedljxxol.heise.de/files/site_script/heise.de.js122ms104ms8ms3rd
https://cmp.heise.de/unified/4.40.1/gdpr-tcf.27718c8cb9d29947d2c1.bundle.js77ms55ms22ms3rd
https://cmp.heise.de/index.html?hasCsp=true&message_id=1454968&consentUUID=null&consent_origin=https%3A%2F%2Fcmp.heise.de%2Fconsent%2Ftcfv2&preload_message=true&version=v172ms1ms2ms3rd
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
Image Optimization
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
https://www.heise.de/icons/svg/logos/svg/heise_plu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 images 199 KB
0 oversized -0 KB
17 legacy format
1 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

B
JS Bundles
10 scripts, 132 KB unused
REVIEW
10 scripts, 132 KB unused
Warning::
https://cmp.heise.de/Notice.8f529.js: 63 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.heise.de/assets/akwa/v24/js/akwa.js: 47 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://responder.wt.heise.de/resp/api/get/2886896...: 22 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 132 KB
132 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cmp.heise.de/Notice.8f529.js91 KB63 KB (69%)✓3rd
https://www.heise.de/assets/akwa/v24/js/akwa.js86 KB47 KB (55%)✓3rd
https://responder.wt.heise.de/resp/api/get/288689636920174?url=https%3A%2F%2Fwww.heise.de%2F&v=547 KB22 KB (48%)✓3rd
https://cmp.heise.de/unified/wrapperMessagingWithoutDetection.js42 KB—✓3rd
https://cmp.heise.de/unified/4.40.1/gdpr-tcf.27718c8cb9d29947d2c1.bundle.js29 KB—✓3rd
https://www.heise.de/assets/akwa/v24/js/738.fa116f.ltc.js29 KB—✓3rd
https://www.heise.de/assets/akwa/v24/js/prismjs.5ce0b0.ltc.js0 KB—✓3rd
https://cmp.heise.de/polyfills.01516.js2 KB—✓3rd
https://cdn.mateti.net/mcp/onsite.min.js35 KB—✓3rd
https://xn2wkedljxxol.heise.de/files/site_script/heise.de.js20 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

A
Page Weight Budget
848 KB transferred, 82 requests
PASS
848 KB transferred, 82 requests
Info::
Page weighs 2.9 MB (848 KB transferred)
Info::
82 HTTP requests
Info::
Estimated 0.17 g CO2 per page load
848 KB / 2.4 MB budget
848 KB transferred
82 requests
0.17 g CO2 per page load
JavaScript 352.3 KiB 42%
Images 199.1 KiB 23%
HTML 131.8 KiB 16%
Fonts 54.1 KiB 6%
CSS 41.4 KiB 5%
Other 31.8 KiB 4%
Other 23.9 KiB 3%
Other 12.9 KiB 2%
Other 401 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
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
2 fonts (54 KB)
PASS
2 fonts (54 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

54 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 4.3 s LCP 8.9 shttps://www.heise.de/assets/fonts/v1/source-sans-variable/ss3vf.woff2ss3vf.woff2 https://www.heise.de/assets/fonts/v1/source-sans-variable/ss3vf.woff2 — 53.8 KiB — 579 ms — font-display: swaphttps://www.heise.de/assets/fonts/v1/source-sans-variable/ss3vf.woff2ss3vf.woff2 https://www.heise.de/assets/fonts/v1/source-sans-variable/ss3vf.woff2 — 274 B — 611 ms — font-display: swap
ss3vf.woff2 woff2 swap
Size 54 KB
Load time 579 ms
Start 967 ms
Risk FOUT — text flashes from fallback to web font
ss3vf.woff2 woff2 swap
Size 0 KB
Load time 611 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
13 hints, 0 missing preconnects
PASS
13 hints, 0 missing preconnects
Info::
Page uses 13 resource hint(s)

Current Resource Hints

preconnect
4
preload
2
dns-prefetch
4
prefetch
3

13 resource hints configured

A
Page Weight Inventory
82 resources · 848 KB · 132 KB savings available
PASS
82 resources · 848 KB · 132 KB savings available
Info::
Within 1MB page-weight target
Got: 848 KB
Info::
~132 KB of savings available
Warning::
81 third-party resources (100% of weight)
82 resources · 847.5 KiB · 81 third-party Within 1MB page-weight target
JavaScript 45% · 381.8 KiB
Image 24% · 200.3 KiB
Document 16% · 132.1 KiB
Font 6% · 54.1 KiB
CSS 5% · 42.1 KiB
Other 4% · 37.1 KiB

~132.5 KiB of savings available

Remove unused JavaScript: 132.5 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Plus.line AG

Network Waterfall
82 requests over 6135ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 4.3 s LCP 8.9 shttps://heise.de// https://heise.de/ — 301 — 373 B — 461 ms — http/1.1https://www.heise.de/www.heise.de/ https://www.heise.de/ — 200 — 128.3 KiB — 933 ms — h2https://www.heise.de/assets/fonts/v1/source-sans-variable/ss3vf.woff2www.heise.de/assets/fonts/v1/source... https://www.heise.de/assets/fonts/v1/source-sans-variable/ss3vf.woff2 — 200 — 53.8 KiB — 579 ms — h2https://www.heise.de/assets/styles/index.csswww.heise.de/assets/styles/index.cs... https://www.heise.de/assets/styles/index.css — 200 — 23.5 KiB — 722 ms — h2https://www.heise.de/assets/akwa/v24/css/akwa.csswww.heise.de/assets/akwa/v24/css/ak... https://www.heise.de/assets/akwa/v24/css/akwa.css — 200 — 11.1 KiB — 721 ms — h2https://www.heise.de/icons/svg/logos/svg/heise_plus_blue.svgwww.heise.de/icons/svg/logos/svg/he... https://www.heise.de/icons/svg/logos/svg/heise_plus_blue.svg — 200 — 327 B — 585 ms — h2https://www.heise.de/icons/svg/logos/svg/heise_plus_blue_negativ.svgwww.heise.de/icons/svg/logos/svg/he... https://www.heise.de/icons/svg/logos/svg/heise_plus_blue_negativ.svg — 200 — 364 B — 584 ms — h2https://www.heise.de/icons/svg/icons/svg/arrow-right-grey-light.svgwww.heise.de/icons/svg/icons/svg/ar... https://www.heise.de/icons/svg/icons/svg/arrow-right-grey-light.svg — 200 — 294 B — 579 ms — h2https://www.heise.de/icons/svg/icons/svg/arrow-right-grey-dark.svgwww.heise.de/icons/svg/icons/svg/ar... https://www.heise.de/icons/svg/icons/svg/arrow-right-grey-dark.svg — 200 — 297 B — 579 ms — h2https://cmp.heise.de/unified/wrapperMessagingWithoutDetection.jscmp.heise.de/unified/wrapperMessagi... https://cmp.heise.de/unified/wrapperMessagingWithoutDetection.js — 200 — 42.0 KiB — 150 ms — h2https://www.heise.de/assets/akwa/v24/js/akwa.jswww.heise.de/assets/akwa/v24/js/akw... https://www.heise.de/assets/akwa/v24/js/akwa.js — 200 — 85.6 KiB — 731 ms — h2https://www.heise.de/icons/ho/touch-icons/manifest.jsonwww.heise.de/icons/ho/touch-icons/m... https://www.heise.de/icons/ho/touch-icons/manifest.json — 200 — 401 B — 553 ms — h2data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4KPHN2ZyB3aWR0aD0iNjk2c…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4KPHN2ZyB3aWR0aD0iNjk2c… — 200 — 0 B — 0 ms — datahttps://www.heise.de/icons/svg/icons/svg/comments_outline_grey_light.svgwww.heise.de/icons/svg/icons/svg/co... https://www.heise.de/icons/svg/icons/svg/comments_outline_grey_light.svg — 200 — 388 B — 602 ms — h2https://www.heise.de/icons/svg/icons/svg/comments_outline_grey_dark.svgwww.heise.de/icons/svg/icons/svg/co... https://www.heise.de/icons/svg/icons/svg/comments_outline_grey_dark.svg — 200 — 386 B — 623 ms — h2https://www.heise.de/icons/svg/icons/svg/video_outline_grey_light.svgwww.heise.de/icons/svg/icons/svg/vi... https://www.heise.de/icons/svg/icons/svg/video_outline_grey_light.svg — 200 — 376 B — 624 ms — h2https://www.heise.de/icons/svg/icons/svg/video_outline_grey_dark.svgwww.heise.de/icons/svg/icons/svg/vi... https://www.heise.de/icons/svg/icons/svg/video_outline_grey_dark.svg — 200 — 376 B — 626 ms — h2https://cmp.heise.de/unified/4.40.1/gdpr-tcf.27718c8cb9d29947d2c1.bundle.jscmp.heise.de/unified/4.40.1/gdpr-tc... https://cmp.heise.de/unified/4.40.1/gdpr-tcf.27718c8cb9d29947d2c1.bundle.js — 200 — 29.4 KiB — 7 ms — h2https://cmp.heise.de/wrapper/v2/meta-data?hasCsp=true&accountId=1603&env=prod&metadata=%7B%22gdpr%22%3A%7B%7D%7D&propertyId=14602&scriptVersion=4.40.1&scriptType=unifiedcmp.heise.de/wrapper/v2/meta-data?h... https://cmp.heise.de/wrapper/v2/meta-data?hasCsp=true&accountId=1603&env=prod&metadata=%7B%22gdpr%22%3A%7B%7D%7D&propertyId=14602&scriptVersion=4.40.1&scriptType=unified — 200 — 761 B — 12 ms — h2https://cmp.heise.de/wrapper/v2/messages?hasCsp=true&env=prod&body=%7B%22accountId%22%3A1603%2C%22campaignEnv%22%3A%22prod%22%2C%22campaigns%22%3A%7B%22gdpr%22%3A%7B%22consentStatus%22%3A%7B%7D%2C%22targetingParams%22%3A%7B%7D%7D%7D%2C%22clientMMSOrigin%22%3A%22https%3A%2F%2Fcmp.heise.de%22%2C%22hasCSP%22%3Atrue%2C%22includeData%22%3A%7B%22localState%22%3A%7B%22type%22%3A%22string%22%7D%2C%22actions%22%3A%7B%22type%22%3A%22RecordString%22%7D%2C%22cookies%22%3A%7B%22type%22%3A%22RecordString%22%7D%7D%2C%22propertyHref%22%3A%22https%3A%2F%2Fwww.heise.de%2F%22%2C%22propertyId%22%3A14602%7D&localState=null&metadata=%7B%22gdpr%22%3A%7B%22applies%22%3Atrue%7D%7D&nonKeyedLocalState=null&ch=51393105751393105793cf&scriptVersion=4.40.1&scriptType=unifiedcmp.heise.de/wrapper/v2/messages?ha... https://cmp.heise.de/wrapper/v2/messages?hasCsp=true&env=prod&body=%7B%22accountId%22%3A1603%2C%22campaignEnv%22%3A%22prod%22%2C%22campaigns%22%3A%7B%22gdpr%22%3A%7B%22consentStatus%22%3A%7B%7D%2C%22targetingParams%22%3A%7B%7D%7D%7D%2C%22clientMMSOrigin%22%3A%22https%3A%2F%2Fcmp.heise.de%22%2C%22hasCSP%22%3Atrue%2C%22includeData%22%3A%7B%22localState%22%3A%7B%22type%22%3A%22string%22%7D%2C%22actions%22%3A%7B%22type%22%3A%22RecordString%22%7D%2C%22cookies%22%3A%7B%22type%22%3A%22RecordString%22%7D%7D%2C%22propertyHref%22%3A%22https%3A%2F%2Fwww.heise.de%2F%22%2C%22propertyId%22%3A14602%7D&localState=null&metadata=%7B%22gdpr%22%3A%7B%22applies%22%3Atrue%7D%7D&nonKeyedLocalState=null&ch=51393105751393105793cf&scriptVersion=4.40.1&scriptType=unified — 200 — 11.4 KiB — 506 ms — h2https://www.heise.de/ivw-bin/ivw/CPwww.heise.de/ivw-bin/ivw/CP https://www.heise.de/ivw-bin/ivw/CP — 200 — 234 B — 460 ms — h2https://cmp.heise.de/wrapper/v2/pv-data?hasCsp=true&env=prod&ch=51393105751393105793cf&scriptVersion=4.40.1&scriptType=unifiedcmp.heise.de/wrapper/v2/pv-data?has... https://cmp.heise.de/wrapper/v2/pv-data?hasCsp=true&env=prod&ch=51393105751393105793cf&scriptVersion=4.40.1&scriptType=unified — 200 — 0 B — 532 ms — h2https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/4/9/3/9/8/1/1/Podcast_Mobil_background_375x424_1_-12728f5363976f3a.png?org_if_sml=1&q=90&width=640heise.cloudimg.io/v7/_www-heise-de_... https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/4/9/3/9/8/1/1/Podcast_Mobil_background_375x424_1_-12728f5363976f3a.png?org_if_sml=1&q=90&width=640 — 200 — 2.8 KiB — 29 ms — h2https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/4/9/3/9/8/1/1/Podcast_Mobil_background_375x424_1_-12728f5363976f3a.png?org_if_sml=1&q=90&width=1280heise.cloudimg.io/v7/_www-heise-de_... https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/4/9/3/9/8/1/1/Podcast_Mobil_background_375x424_1_-12728f5363976f3a.png?org_if_sml=1&q=90&width=1280 — 200 — 3.2 KiB — 43 ms — h2https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/4/9/3/9/8/1/1/Podcast_Desktop_background_1104x252_1_-dfd7946a4bc18aef.png?org_if_sml=1&q=90&width=2048heise.cloudimg.io/v7/_www-heise-de_... https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/4/9/3/9/8/1/1/Podcast_Desktop_background_1104x252_1_-dfd7946a4bc18aef.png?org_if_sml=1&q=90&width=2048 — 200 — 4.5 KiB — 34 ms — h2https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/4/9/3/9/8/1/1/Podcast_Desktop_background_1104x252_1_-dfd7946a4bc18aef.png?org_if_sml=1&q=90&width=2408heise.cloudimg.io/v7/_www-heise-de_... https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/4/9/3/9/8/1/1/Podcast_Desktop_background_1104x252_1_-dfd7946a4bc18aef.png?org_if_sml=1&q=90&width=2408 — 200 — 5.6 KiB — 26 ms — 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200 — 18.0 KiB — 860 ms — h3https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/5/0/6/4/3/5/7/md4TsqPA-70748058c3352df0.jpeg?force_format=avif%2Cwebp%2Cjpeg&org_if_sml=1&q=30&width=186heise.cloudimg.io/v7/_www-heise-de_... https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/5/0/6/4/3/5/7/md4TsqPA-70748058c3352df0.jpeg?force_format=avif%2Cwebp%2Cjpeg&org_if_sml=1&q=30&width=186 — 200 — 1.1 KiB — 1.0 s — h3https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/5/0/5/9/8/2/9/collage-gebrauchtwagen_Christoph_M-86d444be48790519.jpeg?force_format=avif%2Cwebp%2Cjpeg&org_if_sml=1&q=30&width=665heise.cloudimg.io/v7/_www-heise-de_... https://heise.cloudimg.io/v7/_www-heise-de_/imgs/18/5/0/5/9/8/2/9/collage-gebrauchtwagen_Christoph_M-86d444be48790519.jpeg?force_format=avif%2Cwebp%2Cjpeg&org_if_sml=1&q=30&width=665 — 200 — 21.0 KiB — 822 ms — h3https://cmp.heise.de/wrapper/v2/pv-data?hasCsp=true&env=prod&ch=51393105751393105793cf&scriptVersion=4.40.1&scriptType=unifiedcmp.heise.de/wrapper/v2/pv-data?has... https://cmp.heise.de/wrapper/v2/pv-data?hasCsp=true&env=prod&ch=51393105751393105793cf&scriptVersion=4.40.1&scriptType=unified — 200 — 730 B — 489 ms — h2https://cdn.mateti.net/mcp/onsite.min.jscdn.mateti.net/mcp/onsite.min.js https://cdn.mateti.net/mcp/onsite.min.js — 200 — 35.2 KiB — 670 ms — http/1.1https://cmp.heise.de/consent/tcfv2/vendor-list/categories?siteId=14602cmp.heise.de/consent/tcfv2/vendor-l... https://cmp.heise.de/consent/tcfv2/vendor-list/categories?siteId=14602 — 200 — 1.2 KiB — 6 ms — h2https://xn2wkedljxxol.heise.de/files/site_script/heise.de.jsxn2wkedljxxol.heise.de/files/site_s... https://xn2wkedljxxol.heise.de/files/site_script/heise.de.js — 200 — 19.9 KiB — 58 ms — 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https://www.heise.de/assets/fonts/v1/source-sans-variable/ss3vf.woff2 — 200 — 274 B — 611 ms — h2https://xn2wkedljxxol.heise.de/recommendation/reco/stream/FCD54E2B52/77xn2wkedljxxol.heise.de/recommendati... https://xn2wkedljxxol.heise.de/recommendation/reco/stream/FCD54E2B52/77 — 204 — 0 B — 7 ms — h2https://xn2wkedljxxol.heise.de/recommendation/reco/stream/FCD54E2B52/78xn2wkedljxxol.heise.de/recommendati... https://xn2wkedljxxol.heise.de/recommendation/reco/stream/FCD54E2B52/78 — 204 — 0 B — 7 ms — h2https://xn2wkedljxxol.heise.de/recommendation/reco/stream/FCD54E2B52/77xn2wkedljxxol.heise.de/recommendati... https://xn2wkedljxxol.heise.de/recommendation/reco/stream/FCD54E2B52/77 — 200 — 6.4 KiB — 8 ms — h2https://xn2wkedljxxol.heise.de/recommendation/reco/stream/FCD54E2B52/78xn2wkedljxxol.heise.de/recommendati... https://xn2wkedljxxol.heise.de/recommendation/reco/stream/FCD54E2B52/78 — 200 — 3.4 KiB — 7 ms — 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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 5141ms · 481KB · €56/mo
www.heise.de
Other
Costly
Execution 1208ms
Transfer 128 KB
Monthly Cost €13/mo
cmp.heise.de
Other
Costly
Execution 953ms
Transfer 91 KB
Unused 69%
Monthly Cost €10/mo
www.heise.de
Other
Costly
Execution 757ms
Transfer 86 KB
Unused 55%
Monthly Cost €8/mo
Unattributable
Other
Costly
Execution 738ms
Transfer 0 KB
Monthly Cost €8/mo
cmp.heise.de
Other
Costly
Execution 553ms
Transfer 42 KB
Monthly Cost €6/mo
responder.wt.heise.de
Other
Costly
Execution 485ms
Transfer 47 KB
Unused 48%
Monthly Cost €5/mo
cdn.mateti.net
Other
Optional
Execution 176ms
Transfer 35 KB
Monthly Cost €2/mo
xn2wkedljxxol.heise.de
Other
Optional
Execution 122ms
Transfer 20 KB
Monthly Cost €1/mo
cmp.heise.de
Other
Optional
Execution 77ms
Transfer 29 KB
Monthly Cost €1/mo
cmp.heise.de
Other
Optional
Execution 72ms
Transfer 2 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.heise.de adds 1208ms and costs ~€13/month
  • cmp.heise.de adds 953ms and costs ~€10/month
  • www.heise.de adds 757ms and costs ~€8/month
  • Unattributable adds 738ms and costs ~€8/month
  • cmp.heise.de adds 553ms and costs ~€6/month
  • responder.wt.heise.de adds 485ms and costs ~€5/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.heise.de takes 1208ms 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

cmp.heise.de takes 953ms 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

69% of cmp.heise.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.heise.de takes 757ms 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

55% of www.heise.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

Unattributable takes 738ms 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

cmp.heise.de takes 553ms 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

responder.wt.heise.de takes 485ms 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

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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