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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
45
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
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.

6.56 s

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

9.73 s

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

560 ms

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

0.000

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

6.56 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.

14.95 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 2 REVIEW 6 FIX
F
Page Weight Budget
Action
5.6 MB transferred, 93 requests
FIX
5.6 MB transferred, 93 requests
Critical::
Page weighs 8.5 MB (5.6 MB transferred)
Warning::
Images are 4.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.3 MB
Warning::
JavaScript is 898 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 898 KB
Info::
Fonts are 321 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 321 KB
Info::
93 HTTP requests
Info::
Estimated 1.2 g CO2 per page load
5.6 MB / 2.4 MB budget
5.6 MB transferred
93 requests
1.2 g CO2 per page load
Images 4.3 MiB 77%
JavaScript 897.5 KiB 16%
Fonts 321.0 KiB 6%
CSS 61.9 KiB 1%
HTML 34.3 KiB 1%
Other 22.2 KiB 0%
Other 2.7 KiB 0%
Other 778 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Why this matters

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

Source: web.dev

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

Why this matters

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

Source: web.dev font loading

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 (5.6 MiB of 5.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3348ms total JS execution
FIX
3348ms total JS execution
Warning::
https://www.rts.ch/: 797ms CPU time
Warning::
Unattributable: 697ms CPU time
Warning::
https://www.rts.ch/hbv7/resources/letterbox/v/3.37...: 571ms CPU time
Warning::
https://app.usercentrics.eu/browser-ui/3.99.0/inde...: 543ms CPU time
Info::
https://www.rts.ch/hbv7/static/js/rts-usercentrics...: 223ms CPU time
Warning::
Third-party scripts: 3348ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 27% Style & Layout 12% Script Parsing & Compilation 10% Rendering 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.rts.ch/797ms42ms7ms3rd
Unattributable697ms102ms0ms3rd
https://www.rts.ch/hbv7/resources/letterbox/v/3.37/letterbox.js571ms297ms263ms3rd
https://app.usercentrics.eu/browser-ui/3.99.0/index.module.js543ms379ms3ms3rd
https://www.rts.ch/hbv7/static/js/rts-usercentrics.min-c880ac2ab0e033ab0f03be9d19cd848b.js223ms202ms3ms3rd
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js174ms117ms11ms3rd
https://static.chartbeat.com/js/chartbeat.js116ms94ms20ms3rd
https://colibri-js.akamaized.net/penguin/tc_RTS_13.js107ms90ms15ms3rd
https://www.rts.ch/hbv7/resources/boreas/v3.9/boreas_b01.js63ms50ms7ms3rd
https://www.rts.ch/hbv7/static/js/hummingbird.min-6fe09d33e7b84266e412c71a514a2959.js57ms38ms18ms3rd
F
JS Bundles
Action
23 scripts, 549 KB unused
FIX
23 scripts, 549 KB unused
Warning::
https://www.rts.ch/hbv7/resources/letterbox/v/3.37...: 432 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.usercentrics.eu/browser-ui/3.99.0/inde...: 53 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.usercentrics.eu/browser-ui/3.99.0/Virt...: 32 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.rts.ch/hbv7/static/js/hummingbird.min-...: 32 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 549 KB
549 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.rts.ch/hbv7/resources/letterbox/v/3.37/letterbox.js545 KB432 KB (80%)✓3rd
https://app.usercentrics.eu/browser-ui/3.99.0/index.module.js121 KB53 KB (44%)✓3rd
https://app.usercentrics.eu/browser-ui/3.99.0/VirtualServiceItem-e4cab338.js49 KB32 KB (66%)✓3rd
https://www.rts.ch/hbv7/static/js/hummingbird.min-6fe09d33e7b84266e412c71a514a2959.js41 KB32 KB (77%)✓3rd
https://static.chartbeat.com/js/chartbeat.js16 KB—✓3rd
https://app.usercentrics.eu/browser-ui/3.99.0/DefaultUI-4ed6068b-1cf25503.js1 KB—✓3rd
https://app.usercentrics.eu/browser-ui/latest/loader.js11 KB—✓3rd
https://static.chartbeat.com/js/chartbeat_mab.js10 KB—✓3rd
https://www.rts.ch/hbv7/resources/boreas/v3.9/boreas_b01.js19 KB—✓3rd
https://www.rts.ch/hbv7/static/js/rts-usercentrics.min-c880ac2ab0e033ab0f03be9d19cd848b.js6 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

F
Page Weight Inventory
Action
93 resources · 5.6 MB · 549 KB savings available
FIX
93 resources · 5.6 MB · 549 KB savings available
Warning::
Page weight 4.6 MB over 1MB target
Got: 5.6 MB Expected: ≤ 1 MB
Info::
~549 KB of savings available
Warning::
92 third-party resources (100% of weight)
Info::
7 resources over 200KB
93 resources · 5.6 MiB · 92 third-party 4.6 MiB over 1MB target
Image 77% · 4.3 MiB
JavaScript 16% · 897.5 KiB
Font 6% · 321.0 KiB
CSS 1% · 61.9 KiB
Document 1% · 34.4 KiB
Other 0% · 23.0 KiB

~548.8 KiB of savings available

Remove unused JavaScript: 548.8 KiB
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
45 images, 0 KB saveable
REVIEW
45 images, 0 KB saveable
Info::
All images are well-optimized
45 images 4.3 MB
0 oversized -0 KB
45 legacy format
0 missing dimensions CLS risk
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 (321 KB)
PASS
1 fonts (321 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

321 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 6.6 s LCP 9.7 shttps://www.rts.ch/hbv7/resources/fonts/rts-neue/RTS-Neue-VF.woff2RTS-Neue-VF.woff2 https://www.rts.ch/hbv7/resources/fonts/rts-neue/RTS-Neue-VF.woff2 — 321.0 KiB — 236 ms — font-display: swap
RTS-Neue-VF.woff2 woff2 swap
Size 321 KB
Load time 236 ms
Start 536 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~161 KB and ~322 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
1
preload
2
dns-prefetch
—
prefetch
—

3 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
93 requests over 3876ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 6.6 s LCP 9.7 shttps://rts.ch// https://rts.ch/ — 301 — 90 B — 259 ms — h2https://www.rts.ch/www.rts.ch/ https://www.rts.ch/ — 200 — 32.6 KiB — 308 ms — h2https://www.rts.ch/hbv7/resources/fonts/rts-neue/RTS-Neue-VF.woff2www.rts.ch/hbv7/resources/fonts/rts... https://www.rts.ch/hbv7/resources/fonts/rts-neue/RTS-Neue-VF.woff2 — 200 — 321.0 KiB — 236 ms — h2https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.jscdnjs.cloudflare.com/ajax/libs/jque... https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js — 200 — 27.4 KiB — 25 ms — h3https://cdnjs.cloudflare.com/ajax/libs/scrollup/2.4.1/jquery.scrollUp.min.jscdnjs.cloudflare.com/ajax/libs/scro... https://cdnjs.cloudflare.com/ajax/libs/scrollup/2.4.1/jquery.scrollUp.min.js — 200 — 1.4 KiB — 24 ms — h3https://www.rts.ch/hbv7/resources/fonts/rts-neue/rts-neue-var.v1.csswww.rts.ch/hbv7/resources/fonts/rts... https://www.rts.ch/hbv7/resources/fonts/rts-neue/rts-neue-var.v1.css — 200 — 470 B — 93 ms — h2https://www.rts.ch/hbv7/resources/fonts/rtsp/rtsp-v8.3-1/style.csswww.rts.ch/hbv7/resources/fonts/rts... https://www.rts.ch/hbv7/resources/fonts/rtsp/rtsp-v8.3-1/style.css — 200 — 1.6 KiB — 94 ms — h2https://www.rts.ch/hbv7/static/js/rts-usercentrics.min-c880ac2ab0e033ab0f03be9d19cd848b.jswww.rts.ch/hbv7/static/js/rts-userc... https://www.rts.ch/hbv7/static/js/rts-usercentrics.min-c880ac2ab0e033ab0f03be9d19cd848b.js — 200 — 6.2 KiB — 97 ms — h2https://www.rts.ch/hbv7/resources/letterbox/v/3.37/letterbox.jswww.rts.ch/hbv7/resources/letterbox... https://www.rts.ch/hbv7/resources/letterbox/v/3.37/letterbox.js — 200 — 544.6 KiB — 238 ms — h2https://www.rts.ch/hbv7/resources/letterbox/v/3.37/letterbox.csswww.rts.ch/hbv7/resources/letterbox... https://www.rts.ch/hbv7/resources/letterbox/v/3.37/letterbox.css — 200 — 30.6 KiB — 96 ms — h2https://www.rts.ch/hbv7/static/js/hummingbird.min-6fe09d33e7b84266e412c71a514a2959.jswww.rts.ch/hbv7/static/js/hummingbi... https://www.rts.ch/hbv7/static/js/hummingbird.min-6fe09d33e7b84266e412c71a514a2959.js — 200 — 41.4 KiB — 167 ms — h2https://www.rts.ch/hbv7/static/js/rts-transversal-header.min-0f4971c334f96ee7e4d83788517b3bc6.jswww.rts.ch/hbv7/static/js/rts-trans... https://www.rts.ch/hbv7/static/js/rts-transversal-header.min-0f4971c334f96ee7e4d83788517b3bc6.js — 200 — 3.1 KiB — 237 ms — h2https://www.rts.ch/hbv7/static/css/rts-navigation-f08b0cf16d4c8234536f220a971295b6.csswww.rts.ch/hbv7/static/css/rts-navi... https://www.rts.ch/hbv7/static/css/rts-navigation-f08b0cf16d4c8234536f220a971295b6.css — 200 — 14.1 KiB — 102 ms — h2https://www.rts.ch/hbv7/static/css/rts-footer-dfecc29c486214dd6bbdc0d1fb212224.csswww.rts.ch/hbv7/static/css/rts-foot... https://www.rts.ch/hbv7/static/css/rts-footer-dfecc29c486214dd6bbdc0d1fb212224.css — 200 — 2.9 KiB — 271 ms — h2https://www.rts.ch/hbv7/static/css/web/frontpage-5a9750efa2f37a9f64e9540784053fab.csswww.rts.ch/hbv7/static/css/web/fron... https://www.rts.ch/hbv7/static/css/web/frontpage-5a9750efa2f37a9f64e9540784053fab.css — 200 — 12.2 KiB — 272 ms — h2https://img.rts.ch/medias/2026/image/fi2vtv-29219872.image?w=960&h=540img.rts.ch/medias/2026/image/fi2vtv... https://img.rts.ch/medias/2026/image/fi2vtv-29219872.image?w=960&h=540 — 200 — 64.8 KiB — 71 ms — h2https://img.rts.ch/articles/2026/image/rk42m0-29219961.image?w=320&h=240img.rts.ch/articles/2026/image/rk42... https://img.rts.ch/articles/2026/image/rk42m0-29219961.image?w=320&h=240 — 200 — 26.6 KiB — 151 ms — h2https://img.rts.ch/articles/2026/image/44b7kk-29219967.image?w=320&h=240img.rts.ch/articles/2026/image/44b7... https://img.rts.ch/articles/2026/image/44b7kk-29219967.image?w=320&h=240 — 200 — 19.9 KiB — 87 ms — h2https://img.rts.ch/articles/2026/image/4h174c-29219947.image?w=320&h=180img.rts.ch/articles/2026/image/4h17... https://img.rts.ch/articles/2026/image/4h174c-29219947.image?w=320&h=180 — 200 — 16.9 KiB — 63 ms — h2https://img.rts.ch/articles/2026/image/4h174c-29219947.image?w=320&h=240img.rts.ch/articles/2026/image/4h17... https://img.rts.ch/articles/2026/image/4h174c-29219947.image?w=320&h=240 — 200 — 19.4 KiB — 93 ms — h2https://app.usercentrics.eu/browser-ui/latest/loader.jsapp.usercentrics.eu/browser-ui/late... https://app.usercentrics.eu/browser-ui/latest/loader.js — 200 — 10.8 KiB — 37 ms — h2https://static.chartbeat.com/js/chartbeat_mab.jsstatic.chartbeat.com/js/chartbeat_m... https://static.chartbeat.com/js/chartbeat_mab.js — 200 — 10.1 KiB — 13 ms — h2https://img.rts.ch/medias/2026/image/8v3ql5-29219876.image?w=320&h=240img.rts.ch/medias/2026/image/8v3ql5... https://img.rts.ch/medias/2026/image/8v3ql5-29219876.image?w=320&h=240 — 200 — 7.9 KiB — 93 ms — h2https://img.rts.ch/articles/2018/image/wbcvmv-26001716.image?w=320&h=240img.rts.ch/articles/2018/image/wbcv... https://img.rts.ch/articles/2018/image/wbcvmv-26001716.image?w=320&h=240 — 200 — 15.4 KiB — 92 ms — h2https://img.rts.ch/info/culture/spectacles/2026/image/4ir9f-29219343.image?w=320&h=240img.rts.ch/info/culture/spectacles/... https://img.rts.ch/info/culture/spectacles/2026/image/4ir9f-29219343.image?w=320&h=240 — 200 — 7.7 KiB — 92 ms — h2https://img.rts.ch/articles/2026/image/z7590i-29219660.image?w=320&h=240img.rts.ch/articles/2026/image/z759... https://img.rts.ch/articles/2026/image/z7590i-29219660.image?w=320&h=240 — 200 — 4.0 KiB — 114 ms — h2https://kingfisher.rts.ch/res/img/cdns3/sherlock/urn:orphea-image:1945574?w=640&h=360kingfisher.rts.ch/res/img/cdns3/she... https://kingfisher.rts.ch/res/img/cdns3/sherlock/urn:orphea-image:1945574?w=640&h=360 — 200 — 34.1 KiB — 58 ms — h2https://kingfisher.rts.ch/res/img/cdns3/sherlock/urn:orphea-image:347036?w=640&h=360kingfisher.rts.ch/res/img/cdns3/she... https://kingfisher.rts.ch/res/img/cdns3/sherlock/urn:orphea-image:347036?w=640&h=360 — 200 — 64.3 KiB — 60 ms — h2https://www.rts.ch/hbv7/resources/boreas/v3.9/boreas_b01.jswww.rts.ch/hbv7/resources/boreas/v3... https://www.rts.ch/hbv7/resources/boreas/v3.9/boreas_b01.js — 200 — 19.1 KiB — 96 ms — h2https://www.rts.ch/hbv7/static/images/logos/logo_rts-rouge.svgwww.rts.ch/hbv7/static/images/logos... https://www.rts.ch/hbv7/static/images/logos/logo_rts-rouge.svg — 200 — 1.3 KiB — 111 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 6.6 s LCP 9.7 shttps://rts.ch// https://rts.ch/ — 301 — 90 B — 259 ms — h2https://www.rts.ch/www.rts.ch/ https://www.rts.ch/ — 200 — 32.6 KiB — 308 ms — h2https://www.rts.ch/hbv7/resources/fonts/rts-neue/RTS-Neue-VF.woff2www.rts.ch/hbv7/resources/fonts/rts... https://www.rts.ch/hbv7/resources/fonts/rts-neue/RTS-Neue-VF.woff2 — 200 — 321.0 KiB — 236 ms — h2https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.jscdnjs.cloudflare.com/ajax/libs/jque... https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js — 200 — 27.4 KiB — 25 ms — h3https://cdnjs.cloudflare.com/ajax/libs/scrollup/2.4.1/jquery.scrollUp.min.jscdnjs.cloudflare.com/ajax/libs/scro... https://cdnjs.cloudflare.com/ajax/libs/scrollup/2.4.1/jquery.scrollUp.min.js — 200 — 1.4 KiB — 24 ms — h3https://www.rts.ch/hbv7/resources/fonts/rts-neue/rts-neue-var.v1.csswww.rts.ch/hbv7/resources/fonts/rts... https://www.rts.ch/hbv7/resources/fonts/rts-neue/rts-neue-var.v1.css — 200 — 470 B — 93 ms — h2https://www.rts.ch/hbv7/resources/fonts/rtsp/rtsp-v8.3-1/style.csswww.rts.ch/hbv7/resources/fonts/rts... https://www.rts.ch/hbv7/resources/fonts/rtsp/rtsp-v8.3-1/style.css — 200 — 1.6 KiB — 94 ms — h2https://www.rts.ch/hbv7/static/js/rts-usercentrics.min-c880ac2ab0e033ab0f03be9d19cd848b.jswww.rts.ch/hbv7/static/js/rts-userc... https://www.rts.ch/hbv7/static/js/rts-usercentrics.min-c880ac2ab0e033ab0f03be9d19cd848b.js — 200 — 6.2 KiB — 97 ms — h2https://www.rts.ch/hbv7/resources/letterbox/v/3.37/letterbox.jswww.rts.ch/hbv7/resources/letterbox... https://www.rts.ch/hbv7/resources/letterbox/v/3.37/letterbox.js — 200 — 544.6 KiB — 238 ms — h2https://www.rts.ch/hbv7/resources/letterbox/v/3.37/letterbox.csswww.rts.ch/hbv7/resources/letterbox... https://www.rts.ch/hbv7/resources/letterbox/v/3.37/letterbox.css — 200 — 30.6 KiB — 96 ms — h2https://www.rts.ch/hbv7/static/js/hummingbird.min-6fe09d33e7b84266e412c71a514a2959.jswww.rts.ch/hbv7/static/js/hummingbi... 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https://app.usercentrics.eu/browser-ui/3.99.0/DefaultUI-4ed6068b-1cf25503.js — 200 — 836 B — 11 ms — h3https://app.usercentrics.eu/browser-ui/3.99.0/FirstLayerCustomization-94c658d0-158e92da.jsapp.usercentrics.eu/browser-ui/3.99... https://app.usercentrics.eu/browser-ui/3.99.0/FirstLayerCustomization-94c658d0-158e92da.js — 200 — 1.2 KiB — 10 ms — h3https://app.usercentrics.eu/browser-ui/3.99.0/ButtonsCustomization-eaf3a10e-db464fbf.jsapp.usercentrics.eu/browser-ui/3.99... https://app.usercentrics.eu/browser-ui/3.99.0/ButtonsCustomization-eaf3a10e-db464fbf.js — 200 — 300 B — 12 ms — h3https://app.usercentrics.eu/browser-ui/3.99.0/SecondLayerUI-ca9f9496-6ad7b1e2.jsapp.usercentrics.eu/browser-ui/3.99... https://app.usercentrics.eu/browser-ui/3.99.0/SecondLayerUI-ca9f9496-6ad7b1e2.js — 200 — 406 B — 12 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 — 204 — 0 B — 121 ms — h2https://app.usercentrics.eu/browser-ui/3.99.0/PrivacyButton-ee5316e6.jsapp.usercentrics.eu/browser-ui/3.99... https://app.usercentrics.eu/browser-ui/3.99.0/PrivacyButton-ee5316e6.js — 200 — 2.4 KiB — 10 ms — h3https://app.usercentrics.eu/browser-ui/3.99.0/index-8e3e4cd8.jsapp.usercentrics.eu/browser-ui/3.99... https://app.usercentrics.eu/browser-ui/3.99.0/index-8e3e4cd8.js — 200 — 859 B — 11 ms — h3https://uct.service.usercentrics.eu/uct?v=1&sid=uMGC0cq2t&t=1&abv=&r=https%3A%2F%2Fwww.rts.ch%2F&cb=1776900479973uct.service.usercentrics.eu/uct?v=1... https://uct.service.usercentrics.eu/uct?v=1&sid=uMGC0cq2t&t=1&abv=&r=https%3A%2F%2Fwww.rts.ch%2F&cb=1776900479973 — 200 — 254 B — 124 ms — h2https://app.usercentrics.eu/browser-ui/3.99.0/index-ed73c234.jsapp.usercentrics.eu/browser-ui/3.99... https://app.usercentrics.eu/browser-ui/3.99.0/index-ed73c234.js — 200 — 2.3 KiB — 10 ms — h3https://app.usercentrics.eu/browser-ui/3.99.0/VirtualServiceItem-e4cab338.jsapp.usercentrics.eu/browser-ui/3.99... https://app.usercentrics.eu/browser-ui/3.99.0/VirtualServiceItem-e4cab338.js — 200 — 48.8 KiB — 16 ms — h3https://app.usercentrics.eu/browser-ui/3.99.0/SaveButton-593f3f07.jsapp.usercentrics.eu/browser-ui/3.99... https://app.usercentrics.eu/browser-ui/3.99.0/SaveButton-593f3f07.js — 200 — 660 B — 14 ms — h3https://app.usercentrics.eu/browser-ui/3.99.0/DefaultTabs-6f6e8230.jsapp.usercentrics.eu/browser-ui/3.99... https://app.usercentrics.eu/browser-ui/3.99.0/DefaultTabs-6f6e8230.js — 200 — 1.7 KiB — 14 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 — 116 ms — h2https://api.datahub-srgssr.ch/tracking/pageviewapi.datahub-srgssr.ch/tracking/page... https://api.datahub-srgssr.ch/tracking/pageview — 201 — 971 B — 118 ms — h2
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 3348ms · 844KB · CHF53/mo
www.rts.ch
Other
Costly
Execution 797ms
Transfer 33 KB
Monthly Cost CHF13/mo
Unattributable
Other
Costly
Execution 697ms
Transfer 0 KB
Monthly Cost CHF11/mo
www.rts.ch
Other
Costly
Execution 571ms
Transfer 545 KB
Unused 80%
Monthly Cost CHF9/mo
app.usercentrics.eu
Other
Costly
Execution 543ms
Transfer 121 KB
Unused 44%
Monthly Cost CHF9/mo
www.rts.ch
Other
Costly
Execution 223ms
Transfer 6 KB
Monthly Cost CHF4/mo
cdnjs
CDN
Optional
Execution 174ms
Transfer 27 KB
Monthly Cost CHF3/mo
static.chartbeat.com
Other
Optional
Execution 116ms
Transfer 16 KB
Monthly Cost CHF2/mo
colibri-js.akamaized.net
Other
Optional
Execution 107ms
Transfer 36 KB
Monthly Cost CHF2/mo
www.rts.ch
Other
Optional
Execution 63ms
Transfer 19 KB
Monthly Cost CHF1/mo
www.rts.ch
Other
Optional
Execution 57ms
Transfer 41 KB
Unused 77%
Monthly Cost CHF1/mo

These scripts may cost more than they're worth

  • www.rts.ch adds 797ms and costs ~CHF13/month
  • Unattributable adds 697ms and costs ~CHF11/month
  • www.rts.ch adds 571ms and costs ~CHF9/month
  • app.usercentrics.eu adds 543ms and costs ~CHF9/month
  • www.rts.ch adds 223ms and costs ~CHF4/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.rts.ch takes 797ms 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 697ms 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.rts.ch takes 571ms 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

80% of www.rts.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

app.usercentrics.eu takes 543ms 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.rts.ch takes 223ms 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

77% of www.rts.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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