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https://nzz.ch

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
86
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.
96
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.

1.49 s

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

1.61 s

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

46 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.005

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

1.90 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.

2.59 s

Page Load Progression

808 ms
1.6 s
2.4 s
3.2 s
4.0 s
4.8 s
5.7 s
6.5 s
Checks
15
8 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
2.6 MB transferred, 114 requests
FIX
2.6 MB transferred, 114 requests
Warning::
Page weighs 8.0 MB (2.6 MB transferred)
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Warning::
114 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.55 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
114 requests
0.55 g CO2 per page load
JavaScript 1.7 MiB 65%
Images 314.6 KiB 12%
Other 301.5 KiB 11%
HTML 166.6 KiB 6%
Fonts 80.4 KiB 3%
CSS 35.8 KiB 1%
Other 24.5 KiB 1%
Other 8.4 KiB 0%
Other 5.6 KiB 0%
Other 306 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (2.6 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
63 scripts, 833 KB unused
FIX
63 scripts, 833 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 134 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://adnz.co/header.js?adTagId=8: 115 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://nzz-assets.static-nzz.ch/production/web/14...: 107 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://nzz-assets.static-nzz.ch/production/web/14...: 101 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.consentmanager.net/delivery/js/cmp_fin...: 86 KB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 833 KB
833 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945188 KB134 KB (71%)✓3rd
https://adnz.co/header.js?adTagId=8249 KB115 KB (46%)✓3rd
https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/SectionView-CEs6kUFZ.js143 KB107 KB (75%)✓3rd
https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/WidgetPaginated-B9_lMOLQ.js147 KB101 KB (69%)✓3rd
https://cdn.consentmanager.net/delivery/js/cmp_final.min.js?t=2026-4-21101 KB86 KB (85%)✓3rd
https://cdn.piano.io/api/tinypass.min.js133 KB84 KB (63%)✓3rd
https://cdn.moengage.com/release/dc_2/moe_webSdk.min.latest.js101 KB62 KB (61%)✓3rd
https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/const-I6uaA4dk.js81 KB45 KB (55%)✓3rd
https://tms.danzz.ch/scripts/t.min.js39 KB31 KB (82%)✓3rd
https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/chunk-UIGDSWPH-DYoziy-L.js41 KB25 KB (61%)✓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

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
114 resources · 2.6 MB · 833 KB savings available
FIX
114 resources · 2.6 MB · 833 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~833 KB of savings available
Warning::
113 third-party resources (100% of weight)
Info::
2 resources over 200KB
114 resources · 2.6 MiB · 113 third-party 1.6 MiB over 1MB target
JavaScript 65% · 1.7 MiB
Image 12% · 315.6 KiB
Media 11% · 301.5 KiB
Document 6% · 167.1 KiB
Font 3% · 80.4 KiB
Other 1% · 37.4 KiB
CSS 1% · 35.8 KiB

~832.8 KiB of savings available

Remove unused JavaScript: 832.8 KiB
C
JS Execution Cost
Action
1330ms total JS execution
REVIEW
1330ms total JS execution
Warning::
https://nzz-assets.static-nzz.ch/production/web/14...: 333ms CPU time
Info::
https://www.nzz.ch/: 232ms CPU time
Info::
Unattributable: 220ms CPU time
Info::
https://nzz-assets.static-nzz.ch/production/web/14...: 146ms CPU time
Info::
https://adnz.co/header.js?adTagId=8: 124ms CPU time
Warning::
Third-party scripts: 1330ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 20% Style & Layout 13% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/index-Dz6CZgSb.js333ms267ms0ms3rd
https://www.nzz.ch/232ms19ms10ms3rd
Unattributable220ms12ms0ms3rd
https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/SectionView-CEs6kUFZ.js146ms38ms0ms3rd
https://adnz.co/header.js?adTagId=8124ms93ms27ms3rd
blob:https://www.nzz.ch/156e77a8-f960-4ae9-a574-d1fb946daddc100ms97ms0ms3rd
https://cdn.consentmanager.net/delivery/autoblocking/73879c159968.js64ms56ms5ms3rd
https://cdn.moengage.com/release/dc_2/moe_webSdk.min.latest.js56ms42ms7ms3rd
https://cdn.piano.io/api/tinypass.min.js55ms43ms9ms3rd
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
Image Optimization
21 images, 0 KB saveable
PASS
21 images, 0 KB saveable
Info::
All images are well-optimized
21 images 315 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (80 KB)
PASS
3 fonts (80 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

80 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 500 ms 1.0 s 1.5 s FCP 1.5 s LCP 1.6 shttps://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/fonts/gt-america-standard--regular.woff2gt-america-standard--re... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/fonts/gt-america-standard--regular.woff2 — 17.1 KiB — 36 ms — font-display: swaphttps://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/fonts/gt-america-standard--medium.woff2gt-america-standard--me... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/fonts/gt-america-standard--medium.woff2 — 18.1 KiB — 38 ms — font-display: swaphttps://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/fonts/pensumpro-medium.woff2pensumpro-medium.woff2 https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/fonts/pensumpro-medium.woff2 — 45.2 KiB — 42 ms — font-display: swap
gt-america-standard--re... woff2 swap
Size 17 KB
Load time 36 ms
Start 357 ms
Risk FOUT — text flashes from fallback to web font
gt-america-standard--me... woff2 swap
Size 18 KB
Load time 38 ms
Start 357 ms
Risk FOUT — text flashes from fallback to web font
pensumpro-medium.woff2 woff2 swap
Size 45 KB
Load time 42 ms
Start 358 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

A
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
114 requests over 4630ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.5 s LCP 1.6 shttps://nzz.ch// https://nzz.ch/ — 301 — 151 B — 64 ms — h2https://www.nzz.ch/www.nzz.ch/ https://www.nzz.ch/ — 200 — 166.6 KiB — 84 ms — h2https://img-msp-prod.nzz.ch/2026/04/21/1bed2bcf-5725-432b-96da-0ec2b1a0b4d8.jpg?width=976&height=550&fit=bounds&quality=75&auto=webp&crop=4874,2742,x528,y0img-msp-prod.nzz.ch/2026/04/21/1bed... https://img-msp-prod.nzz.ch/2026/04/21/1bed2bcf-5725-432b-96da-0ec2b1a0b4d8.jpg?width=976&height=550&fit=bounds&quality=75&auto=webp&crop=4874,2742,x528,y0 — 200 — 24.8 KiB — 40 ms — h2https://adnz.co/header.js?adTagId=8adnz.co/header.js?adTagId=8 https://adnz.co/header.js?adTagId=8 — 200 — 249.2 KiB — 139 ms — h3https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/entry.client-CD-GzIjB.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/entry.client-CD-GzIjB.js — 200 — 3.8 KiB — 145 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/chunk-UIGDSWPH-DYoziy-L.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/chunk-UIGDSWPH-DYoziy-L.js — 200 — 40.7 KiB — 145 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/index-Dz6CZgSb.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/index-Dz6CZgSb.js — 200 — 56.0 KiB — 143 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/index-B8APXGTb.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/index-B8APXGTb.js — 200 — 1.8 KiB — 143 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/root-DhueB3lc.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/root-DhueB3lc.js — 200 — 33.7 KiB — 105 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/SectionView-CEs6kUFZ.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/SectionView-CEs6kUFZ.js — 200 — 143.4 KiB — 122 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/useTranslation-BiRyJC4Z.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/useTranslation-BiRyJC4Z.js — 200 — 56.6 KiB — 127 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/useTailwindUtils-DzgAbQJz.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/useTailwindUtils-DzgAbQJz.js — 200 — 3.0 KiB — 69 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/const-I6uaA4dk.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/const-I6uaA4dk.js — 200 — 80.9 KiB — 131 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/JwPlayer-BrVOZO4e.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/JwPlayer-BrVOZO4e.js — 200 — 6.6 KiB — 76 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/WidgetPaginated-B9_lMOLQ.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/WidgetPaginated-B9_lMOLQ.js — 200 — 147.1 KiB — 138 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/SwipeMessage-BCh9R9tz.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/SwipeMessage-BCh9R9tz.js — 200 — 3.6 KiB — 73 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/Button-CgBY2__6.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/Button-CgBY2__6.js — 200 — 1.6 KiB — 68 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/swiper-react-jmk_Nkmb.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/swiper-react-jmk_Nkmb.js — 200 — 25.2 KiB — 83 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/clsx-B-dksMZM.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/clsx-B-dksMZM.js — 200 — 573 B — 134 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/Image-DnAK-JlO.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/Image-DnAK-JlO.js — 200 — 6.6 KiB — 134 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/dateFormatting--UpfdOHS.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/dateFormatting--UpfdOHS.js — 200 — 1.2 KiB — 74 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/ArticleImage-C0Et8Gul.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/ArticleImage-C0Et8Gul.js — 200 — 627 B — 134 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/_index-w7_Q1dKG.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/_index-w7_Q1dKG.js — 200 — 2.2 KiB — 136 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/root-6qi1xXUP.cssnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/root-6qi1xXUP.css — 200 — 27.3 KiB — 90 ms — h2https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/SectionView-BAtjx0lP.cssnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/SectionView-BAtjx0lP.css — 200 — 729 B — 77 ms — h2https://www.nzz.ch/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.jswww.nzz.ch/cdn-cgi/scripts/5c5dd728... https://www.nzz.ch/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 814 B — 23 ms — h2https://cdn.speedcurve.com/js/lux.js?id=2410241cdn.speedcurve.com/js/lux.js?id=241... https://cdn.speedcurve.com/js/lux.js?id=2410241 — 200 — 11.3 KiB — 7 ms — h2https://cdn.consentmanager.net/delivery/cmp.min.csscdn.consentmanager.net/delivery/cmp... https://cdn.consentmanager.net/delivery/cmp.min.css — 200 — 7.8 KiB — 95 ms — h2https://cdn.cxense.com/cx.jscdn.cxense.com/cx.js https://cdn.cxense.com/cx.js — 200 — 38.1 KiB — 55 ms — http/1.1https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/pianoClient.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/pianoClient.js — 200 — 3.5 KiB — 47 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.5 s LCP 1.6 shttps://nzz.ch// https://nzz.ch/ — 301 — 151 B — 64 ms — h2https://www.nzz.ch/www.nzz.ch/ https://www.nzz.ch/ — 200 — 166.6 KiB — 84 ms — h2https://img-msp-prod.nzz.ch/2026/04/21/1bed2bcf-5725-432b-96da-0ec2b1a0b4d8.jpg?width=976&height=550&fit=bounds&quality=75&auto=webp&crop=4874,2742,x528,y0img-msp-prod.nzz.ch/2026/04/21/1bed... https://img-msp-prod.nzz.ch/2026/04/21/1bed2bcf-5725-432b-96da-0ec2b1a0b4d8.jpg?width=976&height=550&fit=bounds&quality=75&auto=webp&crop=4874,2742,x528,y0 — 200 — 24.8 KiB — 40 ms — h2https://adnz.co/header.js?adTagId=8adnz.co/header.js?adTagId=8 https://adnz.co/header.js?adTagId=8 — 200 — 249.2 KiB — 139 ms — h3https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/entry.client-CD-GzIjB.jsnzz-assets.static-nzz.ch/production... https://nzz-assets.static-nzz.ch/production/web/14.5.19/assets/entry.client-CD-GzIjB.js — 200 — 3.8 KiB — 145 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 1330ms · 885KB · CHF21/mo
nzz-assets.static-nzz.ch
Other
Costly
Execution 333ms
Transfer 56 KB
Unused 37%
Monthly Cost CHF5/mo
www.nzz.ch
Other
Costly
Execution 232ms
Transfer 167 KB
Monthly Cost CHF4/mo
Unattributable
Other
Costly
Execution 220ms
Transfer 0 KB
Monthly Cost CHF3/mo
nzz-assets.static-nzz.ch
Other
Optional
Execution 146ms
Transfer 143 KB
Unused 75%
Monthly Cost CHF2/mo
adnz.co
Other
Optional
Execution 124ms
Transfer 249 KB
Unused 46%
Monthly Cost CHF2/mo
www.nzz.ch
Other
Optional
Execution 100ms
Transfer 0 KB
Monthly Cost CHF2/mo
cdn.consentmanager.net
Other
Optional
Execution 64ms
Transfer 36 KB
Monthly Cost CHF1/mo
cdn.moengage.com
Other
Optional
Execution 56ms
Transfer 101 KB
Unused 61%
Monthly Cost CHF1/mo
cdn.piano.io
Other
Optional
Execution 55ms
Transfer 133 KB
Unused 63%
Monthly Cost CHF1/mo

These scripts may cost more than they're worth

  • nzz-assets.static-nzz.ch adds 333ms and costs ~CHF5/month
  • www.nzz.ch adds 232ms and costs ~CHF4/month
  • Unattributable adds 220ms and costs ~CHF3/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

nzz-assets.static-nzz.ch takes 333ms 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.nzz.ch takes 232ms 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 220ms 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

75% of nzz-assets.static-nzz.ch'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 cdn.moengage.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

63% of cdn.piano.io'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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