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https://srf.ch

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
2
REVIEW
5
PASS
6
INFO
2

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

Mobile Desktop
97
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

706 ms

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

1.23 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.

0.003

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

921 ms

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

1.23 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 5 REVIEW 2 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 (1.2 MiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
Page Weight Budget
1.2 MB transferred, 115 requests
REVIEW
1.2 MB transferred, 115 requests
Info::
Page weighs 3.1 MB (1.2 MB transferred)
Warning::
115 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.26 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
115 requests
0.26 g CO2 per page load
Images 614.8 KiB 49%
JavaScript 484.6 KiB 39%
CSS 59.6 KiB 5%
Fonts 40.1 KiB 3%
HTML 33.1 KiB 3%
Other 13.6 KiB 1%
Other 1.5 KiB 0%
Other 1.3 KiB 0%
Other 346 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

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

B
Image Optimization
49 images, 0 KB saveable
REVIEW
49 images, 0 KB saveable
Info::
All images are well-optimized
49 images 615 KB
0 oversized -0 KB
19 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
39 scripts, 186 KB unused
REVIEW
39 scripts, 186 KB unused
Warning::
https://www.srf.ch/staticfiles/aron/assets/teaser-...: 57 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.go-mpulse.net/boomerang/BZPKL-66AFB-DVMB...: 37 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://web.cmp.usercentrics.eu/ui/v/3.116.0/WebSd...: 36 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.srf.ch/staticfiles/aron/assets/meta-ta...: 31 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.srf.ch/staticfiles/aron/assets/main.co...: 25 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 186 KB
186 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.srf.ch/staticfiles/aron/assets/teaser-meta.controller-BzQcWu52.js111 KB57 KB (52%)✓3rd
https://s.go-mpulse.net/boomerang/BZPKL-66AFB-DVMB6-MFEJJ-9KHCE57 KB37 KB (65%)✓3rd
https://web.cmp.usercentrics.eu/ui/v/3.116.0/WebSdk.lib.d00a93b7.js56 KB36 KB (64%)✓3rd
https://www.srf.ch/staticfiles/aron/assets/meta-tags-BTKDG7w3.js55 KB31 KB (57%)✓3rd
https://www.srf.ch/staticfiles/aron/assets/main.common-DFNJY443.js34 KB25 KB (76%)✓3rd
https://www.srf.ch/staticfiles/aron/assets/react-error-boundary.esm-BpTYEkZ9.js1 KB—✓3rd
https://www.srf.ch/staticfiles/aron/assets/play-top-module-C5reFKds.js1 KB—✓3rd
https://www.srf.ch/staticfiles/aron/assets/useBaseQuery-yVYOUHLs.js11 KB—✓3rd
https://www.srf.ch/staticfiles/aron/assets/collection-swipeable-0yBVn2vi.js2 KB—✓3rd
https://www.srf.ch/staticfiles/aron/assets/media-progress-bar-CZ86HPbd.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

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

C
Page Weight Inventory
Action
115 resources · 1.2 MB · 186 KB savings available
REVIEW
115 resources · 1.2 MB · 186 KB savings available
Warning::
Page weight 225 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~186 KB of savings available
Warning::
114 third-party resources (100% of weight)
115 resources · 1.2 MiB · 114 third-party 225.0 KiB over 1MB target
Image 49% · 616.0 KiB
JavaScript 39% · 484.6 KiB
CSS 5% · 59.6 KiB
Font 3% · 40.1 KiB
Document 3% · 33.4 KiB
Other 1% · 15.2 KiB

~186.0 KiB of savings available

Remove unused JavaScript: 186.0 KiB
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
488ms total JS execution
PASS
488ms total JS execution
Info::
https://www.srf.ch/: 186ms CPU time
Info::
Unattributable: 141ms CPU time
Info::
https://www.srf.ch/staticfiles/aron/assets/meta-ta...: 100ms CPU time
Info::
https://www.srf.ch/staticfiles/aron/assets/teaser-...: 60ms CPU time
Warning::
Third-party scripts: 488ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 29% Style & Layout 21% Rendering 5% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.srf.ch/186ms13ms1ms3rd
Unattributable141ms11ms0ms3rd
https://www.srf.ch/staticfiles/aron/assets/meta-tags-BTKDG7w3.js100ms74ms0ms3rd
https://www.srf.ch/staticfiles/aron/assets/teaser-meta.controller-BzQcWu52.js60ms50ms1ms3rd
A+
Font Loading
1 fonts (40 KB)
PASS
1 fonts (40 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

40 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 706 ms LCP 1.2 shttps://www.srf.ch/static-assets/fonts/variable/SRGSSRTypeVF_Text_W_Wght.woff2SRGSSRTypeVF_Text_W_Wgh... https://www.srf.ch/static-assets/fonts/variable/SRGSSRTypeVF_Text_W_Wght.woff2 — 40.1 KiB — 52 ms — font-display: swap
SRGSSRTypeVF_Text_W_Wgh... woff2 swap
Size 40 KB
Load time 52 ms
Start 119 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
115 requests over 1505ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 706 ms LCP 1.2 shttps://srf.ch// https://srf.ch/ — 301 — 292 B — 8 ms — h2https://www.srf.ch/www.srf.ch/ https://www.srf.ch/ — 200 — 33.1 KiB — 95 ms — h2https://www.srf.ch/staticfiles/aron/assets/landingpage-C9ejmhIR.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/landingpage-C9ejmhIR.js — 200 — 1.5 KiB — 24 ms — h2https://www.srf.ch/staticfiles/aron/assets/teaser-meta-BBJSl-4a.csswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/teaser-meta-BBJSl-4a.css — 200 — 7.4 KiB — 18 ms — h2https://www.srf.ch/staticfiles/aron/assets/ab-testing-Cc3uPRhC.csswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/ab-testing-Cc3uPRhC.css — 200 — 47.6 KiB — 31 ms — h2https://www.srf.ch/staticfiles/aron/assets/meta-tags-BTKDG7w3.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/meta-tags-BTKDG7w3.js — 200 — 55.1 KiB — 33 ms — h2https://www.srf.ch/staticfiles/aron/assets/ab-testing-B7kFohSi.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/ab-testing-B7kFohSi.js — 200 — 3.3 KiB — 27 ms — h2https://www.srf.ch/staticfiles/aron/assets/media-assets-CU753agg.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/media-assets-CU753agg.js — 200 — 1.0 KiB — 28 ms — h2https://www.srf.ch/staticfiles/aron/assets/teaser-meta.controller-BzQcWu52.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/teaser-meta.controller-BzQcWu52.js — 200 — 111.3 KiB — 58 ms — h2https://www.srf.ch/staticfiles/aron/assets/useBaseQuery-yVYOUHLs.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/useBaseQuery-yVYOUHLs.js — 200 — 10.7 KiB — 35 ms — h2https://www.srf.ch/staticfiles/aron/assets/useQuery-BiTsnIHu.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/useQuery-BiTsnIHu.js — 200 — 981 B — 37 ms — h2https://www.srf.ch/staticfiles/aron/assets/main.common-DFNJY443.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/main.common-DFNJY443.js — 200 — 34.1 KiB — 54 ms — h2https://www.srf.ch/staticfiles/aron/assets/collection-swipeable-0yBVn2vi.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/collection-swipeable-0yBVn2vi.js — 200 — 2.2 KiB — 44 ms — h2https://www.srf.ch/staticfiles/aron/assets/media-progress-bar-CZ86HPbd.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/media-progress-bar-CZ86HPbd.js — 200 — 1.7 KiB — 45 ms — h2https://www.srf.ch/staticfiles/aron/assets/media-progress-DB2rur0F.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/media-progress-DB2rur0F.js — 200 — 1.3 KiB — 47 ms — h2https://www.srf.ch/staticfiles/aron/assets/SrgLoginEvents-CuXaT650.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/SrgLoginEvents-CuXaT650.js — 200 — 1.0 KiB — 48 ms — h2https://www.srf.ch/static-assets/fonts/variable/SRGSSRTypeVF_Text_W_Wght.woff2www.srf.ch/static-assets/fonts/vari... https://www.srf.ch/static-assets/fonts/variable/SRGSSRTypeVF_Text_W_Wght.woff2 — 200 — 40.1 KiB — 52 ms — h2https://www.srf.ch/static/cms/images/320ws/9343c7.webpwww.srf.ch/static/cms/images/320ws/... https://www.srf.ch/static/cms/images/320ws/9343c7.webp — 200 — 14.6 KiB — 54 ms — h2https://www.srf.ch/static/cms/images/320ws/01368d.webpwww.srf.ch/static/cms/images/320ws/... https://www.srf.ch/static/cms/images/320ws/01368d.webp — 200 — 11.1 KiB — 12 ms — h2https://www.srf.ch/static/cms/images/320ws/c9f9ef5.webpwww.srf.ch/static/cms/images/320ws/... https://www.srf.ch/static/cms/images/320ws/c9f9ef5.webp — 200 — 6.7 KiB — 22 ms — h3https://www.srf.ch/static/cms/images/320ws/7380e2.webpwww.srf.ch/static/cms/images/320ws/... https://www.srf.ch/static/cms/images/320ws/7380e2.webp — 200 — 15.0 KiB — 15 ms — h3https://s.go-mpulse.net/boomerang/BZPKL-66AFB-DVMB6-MFEJJ-9KHCEs.go-mpulse.net/boomerang/BZPKL-66A... https://s.go-mpulse.net/boomerang/BZPKL-66AFB-DVMB6-MFEJJ-9KHCE — 200 — 56.5 KiB — 19 ms — h2https://www.srf.ch/static/cms/images/320ws/007185.webpwww.srf.ch/static/cms/images/320ws/... https://www.srf.ch/static/cms/images/320ws/007185.webp — 200 — 17.2 KiB — 32 ms — h3https://www.srf.ch/manifest.webmanifestwww.srf.ch/manifest.webmanifest https://www.srf.ch/manifest.webmanifest — 200 — 346 B — 31 ms — h3https://web.cmp.usercentrics.eu/ui/loader.jsweb.cmp.usercentrics.eu/ui/loader.j... https://web.cmp.usercentrics.eu/ui/loader.js — 200 — 15.4 KiB — 64 ms — h2https://www.srf.ch/staticfiles/aron/assets/videothek-Bbqjsk20.svgwww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/videothek-Bbqjsk20.svg — 200 — 350 B — 13 ms — h3https://www.srf.ch/staticfiles/aron/assets/audiothek-B5eM_tG-.svgwww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/audiothek-B5eM_tG-.svg — 200 — 578 B — 29 ms — h3https://www.srf.ch/staticfiles/aron/assets/searchmenu-DJgQvzGm.svgwww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/searchmenu-DJgQvzGm.svg — 200 — 483 B — 30 ms — h3https://www.srf.ch/staticfiles/aron/assets/caret-C11W6tqP.svgwww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/caret-C11W6tqP.svg — 200 — 246 B — 30 ms — h3https://www.srf.ch/staticfiles/aron/assets/play-icon-video-BgW8Z3Lb.svgwww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/play-icon-video-BgW8Z3Lb.svg — 200 — 444 B — 18 ms — h3
0 ms 500 ms 1.0 s 1.5 s FCP 706 ms LCP 1.2 shttps://srf.ch// https://srf.ch/ — 301 — 292 B — 8 ms — h2https://www.srf.ch/www.srf.ch/ https://www.srf.ch/ — 200 — 33.1 KiB — 95 ms — h2https://www.srf.ch/staticfiles/aron/assets/landingpage-C9ejmhIR.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/landingpage-C9ejmhIR.js — 200 — 1.5 KiB — 24 ms — h2https://www.srf.ch/staticfiles/aron/assets/teaser-meta-BBJSl-4a.csswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/teaser-meta-BBJSl-4a.css — 200 — 7.4 KiB — 18 ms — h2https://www.srf.ch/staticfiles/aron/assets/ab-testing-Cc3uPRhC.csswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/ab-testing-Cc3uPRhC.css — 200 — 47.6 KiB — 31 ms — h2https://www.srf.ch/staticfiles/aron/assets/meta-tags-BTKDG7w3.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/meta-tags-BTKDG7w3.js — 200 — 55.1 KiB — 33 ms — h2https://www.srf.ch/staticfiles/aron/assets/ab-testing-B7kFohSi.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/ab-testing-B7kFohSi.js — 200 — 3.3 KiB — 27 ms — h2https://www.srf.ch/staticfiles/aron/assets/media-assets-CU753agg.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/media-assets-CU753agg.js — 200 — 1.0 KiB — 28 ms — h2https://www.srf.ch/staticfiles/aron/assets/teaser-meta.controller-BzQcWu52.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/teaser-meta.controller-BzQcWu52.js — 200 — 111.3 KiB — 58 ms — h2https://www.srf.ch/staticfiles/aron/assets/useBaseQuery-yVYOUHLs.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/useBaseQuery-yVYOUHLs.js — 200 — 10.7 KiB — 35 ms — h2https://www.srf.ch/staticfiles/aron/assets/useQuery-BiTsnIHu.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/useQuery-BiTsnIHu.js — 200 — 981 B — 37 ms — h2https://www.srf.ch/staticfiles/aron/assets/main.common-DFNJY443.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/main.common-DFNJY443.js — 200 — 34.1 KiB — 54 ms — h2https://www.srf.ch/staticfiles/aron/assets/collection-swipeable-0yBVn2vi.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/collection-swipeable-0yBVn2vi.js — 200 — 2.2 KiB — 44 ms — h2https://www.srf.ch/staticfiles/aron/assets/media-progress-bar-CZ86HPbd.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/media-progress-bar-CZ86HPbd.js — 200 — 1.7 KiB — 45 ms — h2https://www.srf.ch/staticfiles/aron/assets/media-progress-DB2rur0F.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/media-progress-DB2rur0F.js — 200 — 1.3 KiB — 47 ms — h2https://www.srf.ch/staticfiles/aron/assets/SrgLoginEvents-CuXaT650.jswww.srf.ch/staticfiles/aron/assets/... https://www.srf.ch/staticfiles/aron/assets/SrgLoginEvents-CuXaT650.js — 200 — 1.0 KiB — 48 ms — h2https://www.srf.ch/static-assets/fonts/variable/SRGSSRTypeVF_Text_W_Wght.woff2www.srf.ch/static-assets/fonts/vari... https://www.srf.ch/static-assets/fonts/variable/SRGSSRTypeVF_Text_W_Wght.woff2 — 200 — 40.1 KiB — 52 ms — h2https://www.srf.ch/static/cms/images/320ws/9343c7.webpwww.srf.ch/static/cms/images/320ws/... https://www.srf.ch/static/cms/images/320ws/9343c7.webp — 200 — 14.6 KiB — 54 ms — h2https://www.srf.ch/static/cms/images/320ws/01368d.webpwww.srf.ch/static/cms/images/320ws/... https://www.srf.ch/static/cms/images/320ws/01368d.webp — 200 — 11.1 KiB — 12 ms — h2https://www.srf.ch/static/cms/images/320ws/c9f9ef5.webpwww.srf.ch/static/cms/images/320ws/... https://www.srf.ch/static/cms/images/320ws/c9f9ef5.webp — 200 — 6.7 KiB — 22 ms — h3https://www.srf.ch/static/cms/images/320ws/7380e2.webpwww.srf.ch/static/cms/images/320ws/... 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https://c.go-mpulse.net/api/config.json?key=BZPKL-66AFB-DVMB6-MFEJJ-9KHCE&d=www.srf.ch&t=5922733&v=1.720.0&sl=0&si=1664827f-04c2-4196-92b4-2e59c6c9451d-tdvew5&plugins=AK,ConfigOverride,Continuity,PageParams,IFrameDelay,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,CrossDomain,BW,PaintTiming,NavigationTiming,ResourceTiming,Memory,CACHE_RELOAD,Errors,TPAnalytics,UserTiming,Akamai,Early,EventTiming,LOGN&acao=&ak.ai=208789 — 200 — 214 B — 236 ms — h2https://v1.api.service.cmp.usercentrics.eu/latest/core/bNAhh8SkBv1.api.service.cmp.usercentrics.eu/... https://v1.api.service.cmp.usercentrics.eu/latest/core/bNAhh8SkB — 200 — 259 B — 21 ms — h2https://app.usercentrics.eu/session/1px.png?settingsId=bNAhh8SkBapp.usercentrics.eu/session/1px.png... https://app.usercentrics.eu/session/1px.png?settingsId=bNAhh8SkB — 200 — 1.0 KiB — 62 ms — h2https://v1.api.service.cmp.usercentrics.eu/latest/1/cmp/de/GDPR/bNAhh8SkB/141.60.199/141.60.199v1.api.service.cmp.usercentrics.eu/... https://v1.api.service.cmp.usercentrics.eu/latest/1/cmp/de/GDPR/bNAhh8SkB/141.60.199/141.60.199 — 200 — 11.6 KiB — 22 ms — h2https://web.cmp.usercentrics.eu/ui/v/3.116.0/GdprCmpController.c4576b71.jsweb.cmp.usercentrics.eu/ui/v/3.116.... https://web.cmp.usercentrics.eu/ui/v/3.116.0/GdprCmpController.c4576b71.js — 200 — 9.4 KiB — 20 ms — h3https://uct.service.usercentrics.eu/uct?v=2&sid=bNAhh8SkB&t=24&abv=&r=https%3A%2F%2Fwww.srf.ch%2F&cb=1776819750164uct.service.usercentrics.eu/uct?v=2... https://uct.service.usercentrics.eu/uct?v=2&sid=bNAhh8SkB&t=24&abv=&r=https%3A%2F%2Fwww.srf.ch%2F&cb=1776819750164 — 200 — 255 B — 75 ms — h2https://consent-api.service.consent.usercentrics.eu/consent/uw/3consent-api.service.consent.usercen... https://consent-api.service.consent.usercentrics.eu/consent/uw/3 — 204 — 0 B — 64 ms — h2https://web.cmp.usercentrics.eu/ui/TvGdprCmpView.f15b9a90.jsweb.cmp.usercentrics.eu/ui/TvGdprCm... https://web.cmp.usercentrics.eu/ui/TvGdprCmpView.f15b9a90.js — 200 — 29.6 KiB — 27 ms — h3https://web.cmp.usercentrics.eu/ui/v/3.116.0/UcGdprCmpView.b05dbc41.jsweb.cmp.usercentrics.eu/ui/v/3.116.... https://web.cmp.usercentrics.eu/ui/v/3.116.0/UcGdprCmpView.b05dbc41.js — 200 — 18.4 KiB — 33 ms — h3https://uct.service.usercentrics.eu/uct?v=2&sid=bNAhh8SkB&t=1&abv=&r=https%3A%2F%2Fwww.srf.ch%2F&cb=1776819750209uct.service.usercentrics.eu/uct?v=2... https://uct.service.usercentrics.eu/uct?v=2&sid=bNAhh8SkB&t=1&abv=&r=https%3A%2F%2Fwww.srf.ch%2F&cb=1776819750209 — 200 — 113 B — 39 ms — h2https://web.cmp.usercentrics.eu/ui/v/3.116.0/sections.c79e0e02.jsweb.cmp.usercentrics.eu/ui/v/3.116.... https://web.cmp.usercentrics.eu/ui/v/3.116.0/sections.c79e0e02.js — 200 — 1.8 KiB — 21 ms — h3https://consent-api.service.consent.usercentrics.eu/consent/uw/3consent-api.service.consent.usercen... https://consent-api.service.consent.usercentrics.eu/consent/uw/3 — 201 — 74 B — 192 ms — h2https://web.cmp.usercentrics.eu/ui/v/3.116.0/secondLayer.b796d0f0.jsweb.cmp.usercentrics.eu/ui/v/3.116.... https://web.cmp.usercentrics.eu/ui/v/3.116.0/secondLayer.b796d0f0.js — 200 — 3.0 KiB — 21 ms — h3https://web.cmp.usercentrics.eu/ui/v/3.116.0/getToastifyStyle.4f0a73d7.jsweb.cmp.usercentrics.eu/ui/v/3.116.... https://web.cmp.usercentrics.eu/ui/v/3.116.0/getToastifyStyle.4f0a73d7.js — 200 — 716 B — 20 ms — h3https://www.srf.ch/static/cms/images/640w/374230.jpgwww.srf.ch/static/cms/images/640w/3... https://www.srf.ch/static/cms/images/640w/374230.jpg — 200 — 13.9 KiB — 13 ms — h3https://www.srf.ch/build/assets/srf-favicon-DaOBCX1Y.svgwww.srf.ch/build/assets/srf-favicon... https://www.srf.ch/build/assets/srf-favicon-DaOBCX1Y.svg — 200 — 650 B — 11 ms — h3https://www.srf.ch/build/assets/srf-favicon-C_rOViKC.icowww.srf.ch/build/assets/srf-favicon... https://www.srf.ch/build/assets/srf-favicon-C_rOViKC.ico — 200 — 634 B — 9 ms — h3https://api.datahub-srgssr.ch/tracking/uieventapi.datahub-srgssr.ch/tracking/uiev... https://api.datahub-srgssr.ch/tracking/uievent — 201 — 970 B — 54 ms — h2https://api.datahub-srgssr.ch/tracking/pageviewapi.datahub-srgssr.ch/tracking/page... https://api.datahub-srgssr.ch/tracking/pageview — 201 — 31 B — 57 ms — h3
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 488ms · 199KB · CHF8/mo
www.srf.ch
Other
Optional
Execution 186ms
Transfer 33 KB
Monthly Cost CHF3/mo
Unattributable
Other
Optional
Execution 141ms
Transfer 0 KB
Monthly Cost CHF2/mo
www.srf.ch
Other
Optional
Execution 100ms
Transfer 55 KB
Unused 57%
Monthly Cost CHF2/mo
www.srf.ch
Other
Optional
Execution 60ms
Transfer 111 KB
Unused 52%
Monthly Cost CHF1/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

57% of www.srf.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

52% of www.srf.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

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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