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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
78
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.
100
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.

1.68 s

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

2.49 s

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

42 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.

1.92 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.

2.86 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
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
6.6 MB transferred, 104 requests
FIX
6.6 MB transferred, 104 requests
Critical::
Page weighs 9.6 MB (6.6 MB transferred)
Warning::
Images are 5.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.3 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
Warning::
104 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.4 g CO2 per page load
6.6 MB / 2.4 MB budget
6.6 MB transferred
104 requests
1.4 g CO2 per page load
Images 5.3 MiB 80%
JavaScript 897.5 KiB 13%
Fonts 321.0 KiB 5%
CSS 61.9 KiB 1%
HTML 34.3 KiB 1%
Other 22.2 KiB 0%
Other 2.7 KiB 0%
Other 783 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

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 (6.6 MiB of 6.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
23 scripts, 550 KB unused
FIX
23 scripts, 550 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: 550 KB
550 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/static/js/rts-usercentrics.min-c880ac2ab0e033ab0f03be9d19cd848b.js6 KB—✓3rd
https://www.rts.ch/hbv7/resources/boreas/v3.9/boreas_b01.js19 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
104 resources · 6.6 MB · 550 KB savings available
FIX
104 resources · 6.6 MB · 550 KB savings available
Warning::
Page weight 5.6 MB over 1MB target
Got: 6.6 MB Expected: ≤ 1 MB
Info::
~550 KB of savings available
Warning::
103 third-party resources (100% of weight)
Info::
8 resources over 200KB
104 resources · 6.6 MiB · 103 third-party 5.6 MiB over 1MB target
Image 80% · 5.3 MiB
JavaScript 13% · 897.5 KiB
Font 5% · 321.0 KiB
CSS 1% · 61.9 KiB
Document 1% · 34.3 KiB
Other 0% · 23.0 KiB

~549.5 KiB of savings available

Remove unused JavaScript: 549.5 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
56 images, 0 KB saveable
REVIEW
56 images, 0 KB saveable
Info::
All images are well-optimized
56 images 5.3 MB
0 oversized -0 KB
56 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
770ms total JS execution
REVIEW
770ms total JS execution
Info::
https://www.rts.ch/: 243ms CPU time
Info::
Unattributable: 234ms CPU time
Info::
https://www.rts.ch/hbv7/resources/letterbox/v/3.37...: 142ms CPU time
Info::
https://app.usercentrics.eu/browser-ui/3.99.0/inde...: 98ms CPU time
Info::
https://www.rts.ch/hbv7/static/js/rts-usercentrics...: 52ms CPU time
Warning::
Third-party scripts: 770ms (100% of total)

Main Thread Breakdown

Script Evaluation 39% Other 33% Script Parsing & Compilation 11% Style & Layout 9% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.rts.ch/243ms10ms2ms3rd
Unattributable234ms45ms0ms3rd
https://www.rts.ch/hbv7/resources/letterbox/v/3.37/letterbox.js142ms73ms68ms3rd
https://app.usercentrics.eu/browser-ui/3.99.0/index.module.js98ms64ms1ms3rd
https://www.rts.ch/hbv7/static/js/rts-usercentrics.min-c880ac2ab0e033ab0f03be9d19cd848b.js52ms50ms1ms3rd
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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.7 s LCP 2.5 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 — 64 ms — font-display: swap
RTS-Neue-VF.woff2 woff2 swap
Size 321 KB
Load time 64 ms
Start 343 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
104 requests over 2496ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.7 s LCP 2.5 shttps://rts.ch// https://rts.ch/ — 301 — 90 B — 260 ms — h2https://www.rts.ch/www.rts.ch/ https://www.rts.ch/ — 200 — 32.6 KiB — 71 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 — 64 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 — 27 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 — 68 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 — 38 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 — 69 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 — 176 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 — 59 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 — 78 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 — 74 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 — 40 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 — 66 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 — 40 ms — h2https://img.rts.ch/medias/2026/image/fi2vtv-29219872.image?w=1280&h=720img.rts.ch/medias/2026/image/fi2vtv... https://img.rts.ch/medias/2026/image/fi2vtv-29219872.image?w=1280&h=720 — 200 — 101.8 KiB — 98 ms — h2https://img.rts.ch/articles/2026/image/rk42m0-29219961.image?w=640&h=360img.rts.ch/articles/2026/image/rk42... https://img.rts.ch/articles/2026/image/rk42m0-29219961.image?w=640&h=360 — 200 — 68.6 KiB — 67 ms — h2https://img.rts.ch/articles/2026/image/44b7kk-29219967.image?w=640&h=360img.rts.ch/articles/2026/image/44b7... https://img.rts.ch/articles/2026/image/44b7kk-29219967.image?w=640&h=360 — 200 — 53.0 KiB — 60 ms — h2https://img.rts.ch/articles/2026/image/4h174c-29219947.image?w=640&h=360img.rts.ch/articles/2026/image/4h17... https://img.rts.ch/articles/2026/image/4h174c-29219947.image?w=640&h=360 — 200 — 51.0 KiB — 26 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 — 18 ms — h2https://app.usercentrics.eu/browser-ui/3.99.0/index.module.jsapp.usercentrics.eu/browser-ui/3.99... https://app.usercentrics.eu/browser-ui/3.99.0/index.module.js — 200 — 120.7 KiB — 35 ms — h3https://img.rts.ch/medias/2026/image/8v3ql5-29219876.image?w=640&h=360img.rts.ch/medias/2026/image/8v3ql5... https://img.rts.ch/medias/2026/image/8v3ql5-29219876.image?w=640&h=360 — 200 — 17.5 KiB — 41 ms — h2https://img.rts.ch/articles/2018/image/wbcvmv-26001716.image?w=640&h=360img.rts.ch/articles/2018/image/wbcv... https://img.rts.ch/articles/2018/image/wbcvmv-26001716.image?w=640&h=360 — 200 — 31.5 KiB — 54 ms — h2https://img.rts.ch/info/culture/spectacles/2026/image/4ir9f-29219343.image?w=640&h=360img.rts.ch/info/culture/spectacles/... https://img.rts.ch/info/culture/spectacles/2026/image/4ir9f-29219343.image?w=640&h=360 — 200 — 17.3 KiB — 26 ms — h2https://img.rts.ch/articles/2026/image/z7590i-29219660.image?w=640&h=360img.rts.ch/articles/2026/image/z759... https://img.rts.ch/articles/2026/image/z7590i-29219660.image?w=640&h=360 — 200 — 11.6 KiB — 31 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 — 63 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 — 61 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 — 26 ms — h2https://api.usercentrics.eu/ruleSet/pZkp1mXz4eQw8G.jsonapi.usercentrics.eu/ruleSet/pZkp1mX... https://api.usercentrics.eu/ruleSet/pZkp1mXz4eQw8G.json — 200 — 0 B — 135 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.7 s LCP 2.5 shttps://rts.ch// https://rts.ch/ — 301 — 90 B — 260 ms — h2https://www.rts.ch/www.rts.ch/ https://www.rts.ch/ — 200 — 32.6 KiB — 71 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 — 64 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 — 27 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 — 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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 770ms · 704KB · CHF12/mo
www.rts.ch
Other
Costly
Execution 243ms
Transfer 33 KB
Monthly Cost CHF4/mo
Unattributable
Other
Costly
Execution 234ms
Transfer 0 KB
Monthly Cost CHF4/mo
www.rts.ch
Other
Optional
Execution 142ms
Transfer 545 KB
Unused 80%
Monthly Cost CHF2/mo
app.usercentrics.eu
Other
Optional
Execution 98ms
Transfer 121 KB
Unused 44%
Monthly Cost CHF2/mo
www.rts.ch
Other
Optional
Execution 52ms
Transfer 6 KB
Monthly Cost CHF1/mo

These scripts may cost more than they're worth

  • www.rts.ch adds 243ms and costs ~CHF4/month
  • Unattributable adds 234ms 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 243ms 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 234ms 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

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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