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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
71
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.

3.48 s

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

5.41 s

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

144 ms

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

0.007

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

3.48 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.

7.27 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
7 PASS 5 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 (1.1 MiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2007ms total JS execution
FIX
2007ms total JS execution
Warning::
https://www.srf.ch/: 690ms CPU time
Warning::
Unattributable: 444ms CPU time
Warning::
https://www.srf.ch/staticfiles/aron/assets/meta-ta...: 350ms CPU time
Info::
https://www.srf.ch/staticfiles/aron/assets/teaser-...: 193ms CPU time
Info::
https://static.chartbeat.com/js/chartbeat.js: 79ms CPU time
Warning::
Third-party scripts: 2007ms (100% of total)

Main Thread Breakdown

Script Evaluation 39% Style & Layout 25% Other 24% Rendering 6% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.srf.ch/690ms30ms5ms3rd
Unattributable444ms28ms0ms3rd
https://www.srf.ch/staticfiles/aron/assets/meta-tags-BTKDG7w3.js350ms268ms1ms3rd
https://www.srf.ch/staticfiles/aron/assets/teaser-meta.controller-BzQcWu52.js193ms167ms1ms3rd
https://static.chartbeat.com/js/chartbeat.js79ms72ms3ms3rd
https://web.cmp.usercentrics.eu/ui/v/3.116.0/WebSdk.lib.d00a93b7.js70ms47ms22ms3rd
https://www.srf.ch/static-assets/mapp/smart-pixel.min.js66ms50ms8ms3rd
https://s.go-mpulse.net/boomerang/BZPKL-66AFB-DVMB6-MFEJJ-9KHCE65ms42ms16ms3rd
https://web.cmp.usercentrics.eu/ui/v/3.116.0/UcGdprCmpView.b05dbc41.js52ms32ms7ms3rd
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
1.1 MB transferred, 100 requests
REVIEW
1.1 MB transferred, 100 requests
Info::
Page weighs 2.9 MB (1.1 MB transferred)
Info::
100 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
100 requests
0.24 g CO2 per page load
Images 526.5 KiB 46%
JavaScript 477.9 KiB 41%
CSS 57.5 KiB 5%
Fonts 40.1 KiB 3%
HTML 33.1 KiB 3%
Other 13.5 KiB 1%
Other 1.5 KiB 0%
Other 1.3 KiB 0%
Other 347 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
B
Image Optimization
45 images, 0 KB saveable
REVIEW
45 images, 0 KB saveable
Info::
All images are well-optimized
45 images 527 KB
0 oversized -0 KB
19 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
31 scripts, 187 KB unused
REVIEW
31 scripts, 187 KB unused
Warning::
https://www.srf.ch/staticfiles/aron/assets/teaser-...: 58 KB unused (53%)
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: 187 KB
187 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.srf.ch/staticfiles/aron/assets/teaser-meta.controller-BzQcWu52.js111 KB58 KB (53%)✓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/static-assets/mapp/smart-pixel.min.js32 KB—✓3rd
https://www.srf.ch/staticfiles/aron/assets/react-error-boundary.esm-BpTYEkZ9.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

B
Page Weight Inventory
100 resources · 1.1 MB · 187 KB savings available
REVIEW
100 resources · 1.1 MB · 187 KB savings available
Warning::
Page weight 128 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~187 KB of savings available
Warning::
99 third-party resources (100% of weight)
100 resources · 1.1 MiB · 99 third-party 127.8 KiB over 1MB target
Image 46% · 527.8 KiB
JavaScript 41% · 477.9 KiB
CSS 5% · 57.5 KiB
Font 3% · 40.1 KiB
Document 3% · 33.4 KiB
Other 1% · 15.1 KiB

~187.2 KiB of savings available

Remove unused JavaScript: 187.2 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+
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.5 s LCP 5.4 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 — 54 ms — font-display: swap
SRGSSRTypeVF_Text_W_Wgh... woff2 swap
Size 40 KB
Load time 54 ms
Start 123 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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
1
preload
4
dns-prefetch
—
prefetch
—

5 resource hints configured

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
Network Waterfall
100 requests over 1641ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.5 s LCP 5.4 shttps://srf.ch// https://srf.ch/ — 301 — 292 B — 15 ms — h2https://www.srf.ch/www.srf.ch/ https://www.srf.ch/ — 200 — 33.1 KiB — 90 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 — 34 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 — 19 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 — 40 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 — 42 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 — 35 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 — 36 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 — 63 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 — 42 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 — 44 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 — 59 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 — 47 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 — 48 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 — 50 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 — 54 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 — 54 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 — 57 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 — 22 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 — 30 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 — 50 ms — h2https://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 — 14 ms — h3https://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 — 23 ms — h3https://www.srf.ch/manifest.webmanifestwww.srf.ch/manifest.webmanifest https://www.srf.ch/manifest.webmanifest — 200 — 347 B — 34 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 — 66 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 — 12 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 — 14 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 — 12 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 — 12 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 — 10 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.5 s LCP 5.4 shttps://srf.ch// https://srf.ch/ — 301 — 292 B — 15 ms — h2https://www.srf.ch/www.srf.ch/ https://www.srf.ch/ — 200 — 33.1 KiB — 90 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 — 34 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 — 19 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 — 40 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 — 42 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 — 35 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 — 36 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 — 63 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 — 42 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 — 44 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 — 59 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 — 47 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 — 48 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 — 50 ms — h2https://www.srf.ch/staticfiles/aron/assets/SrgLoginEvents-CuXaT650.jswww.srf.ch/staticfiles/aron/assets/... 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https://uct.service.usercentrics.eu/uct?v=2&sid=bNAhh8SkB&t=1&abv=&r=https%3A%2F%2Fwww.srf.ch%2F&cb=1776819732413 — 200 — 112 B — 46 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://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 — 24 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 — 43 ms — h2https://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 — 649 B — 12 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 — 633 B — 9 ms — h3https://api.datahub-srgssr.ch/tracking/uieventapi.datahub-srgssr.ch/tracking/uiev... https://api.datahub-srgssr.ch/tracking/uievent — 201 — 969 B — 52 ms — h2https://api.datahub-srgssr.ch/tracking/pageviewapi.datahub-srgssr.ch/tracking/page... https://api.datahub-srgssr.ch/tracking/pageview — 201 — 31 B — 123 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 2007ms · 378KB · CHF32/mo
www.srf.ch
Other
Costly
Execution 690ms
Transfer 33 KB
Monthly Cost CHF11/mo
Unattributable
Other
Costly
Execution 444ms
Transfer 0 KB
Monthly Cost CHF7/mo
www.srf.ch
Other
Costly
Execution 350ms
Transfer 55 KB
Unused 57%
Monthly Cost CHF6/mo
www.srf.ch
Other
Optional
Execution 193ms
Transfer 111 KB
Unused 53%
Monthly Cost CHF3/mo
static.chartbeat.com
Other
Optional
Execution 79ms
Transfer 16 KB
Monthly Cost CHF1/mo
web.cmp.usercentrics.eu
Other
Optional
Execution 70ms
Transfer 56 KB
Unused 64%
Monthly Cost CHF1/mo
www.srf.ch
Other
Optional
Execution 66ms
Transfer 32 KB
Monthly Cost CHF1/mo
s.go-mpulse.net
Other
Optional
Execution 65ms
Transfer 57 KB
Unused 65%
Monthly Cost CHF1/mo
web.cmp.usercentrics.eu
Other
Optional
Execution 52ms
Transfer 18 KB
Monthly Cost CHF1/mo

These scripts may cost more than they're worth

  • www.srf.ch adds 690ms and costs ~CHF11/month
  • Unattributable adds 444ms and costs ~CHF7/month
  • www.srf.ch adds 350ms and costs ~CHF6/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.srf.ch takes 690ms 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 444ms 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.srf.ch takes 350ms 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

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

53% 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

64% of web.cmp.usercentrics.eu'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

65% of s.go-mpulse.net'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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