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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
37
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

4.88 s

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

11.22 s

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

1.28 s

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.

5.47 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.

11.55 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
8 PASS 3 REVIEW 4 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 (1.0 MiB of 1.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3515ms total JS execution
FIX
3515ms total JS execution
Warning::
https://www.sbb.ch/_next/static/chunks/826-048dc7d...: 829ms CPU time
Warning::
https://www.sbb.ch/_next/static/chunks/7934-cb647c...: 730ms CPU time
Warning::
https://www.sbb.ch/_next/static/chunks/6416-6146ec...: 374ms CPU time
Warning::
https://www.sbb.ch/de: 359ms CPU time
Warning::
https://www.sbb.ch/_next/static/chunks/4bd1b696-27...: 346ms CPU time
Warning::
Third-party scripts: 3515ms (100% of total)

Main Thread Breakdown

Script Evaluation 67% Other 13% Script Parsing & Compilation 9% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://www.sbb.ch/_next/static/chunks/826-048dc7d7515e7b0e.js829ms655ms56ms3rd
https://www.sbb.ch/_next/static/chunks/7934-cb647c66c01a08e9.js730ms692ms16ms3rd
https://www.sbb.ch/_next/static/chunks/6416-6146ecf912fb2171.js374ms306ms67ms3rd
https://www.sbb.ch/de359ms6ms8ms3rd
https://www.sbb.ch/_next/static/chunks/4bd1b696-2786e1b9b0fd565e.js346ms322ms20ms3rd
Unattributable287ms26ms0ms3rd
https://assets.adobedtm.com/15ff638fdec4/c95c437e4f34/launch-64ab29f9e77a.min.js151ms73ms19ms3rd
https://www.sbb.ch/_next/static/chunks/9721.844496166aca959f.js151ms124ms4ms3rd
https://www.sbb.ch/_next/static/chunks/page_view_event-aggregate.f53f3f58905d0c75.js81ms70ms1ms3rd
https://www.sbb.ch/_next/static/chunks/app/%5Blocale%5D/%5B%5B...slug%5D%5D/page-1a6acf1713a11205.js80ms2ms77ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
35 scripts, 320 KB unused
FIX
35 scripts, 320 KB unused
Warning::
https://www.sbb.ch/_next/static/chunks/6416-6146ec...: 107 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.sbb.ch/_next/static/chunks/app/%5Bloca...: 79 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.sbb.ch/_next/static/chunks/826-048dc7d...: 75 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.sbb.ch/_next/static/chunks/2566-ffe1f4...: 33 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://siteintercept.qualtrics.com/dxjsmodule/12....: 25 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 320 KB
320 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.sbb.ch/_next/static/chunks/6416-6146ecf912fb2171.js222 KB107 KB (49%)✓3rd
https://www.sbb.ch/_next/static/chunks/app/%5Blocale%5D/%5B%5B...slug%5D%5D/page-1a6acf1713a11205.js161 KB79 KB (50%)✓3rd
https://www.sbb.ch/_next/static/chunks/826-048dc7d7515e7b0e.js168 KB75 KB (45%)✓3rd
https://www.sbb.ch/_next/static/chunks/2566-ffe1f4f22e916d09.js66 KB33 KB (51%)✓3rd
https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.sbb.ch36 KB25 KB (71%)✓3rd
https://www.sbb.ch/_next/static/chunks/app/%5Blocale%5D/%5B%5B...slug%5D%5D/layout-c6a2e4385c522292.js6 KB—✓3rd
https://www.sbb.ch/_next/static/chunks/session-manager.860fbb915d80a085.js3 KB—✓3rd
https://www.sbb.ch/_next/static/chunks/8667-bbe49b61dc300f1e.js9 KB—✓3rd
https://www.sbb.ch/_next/static/chunks/app/not-found-ee2f8454dc5f93aa.js2 KB—✓3rd
https://www.sbb.ch/_next/static/chunks/app/global-error-67be868b8926d1ae.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

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
1.0 MB transferred, 87 requests
REVIEW
1.0 MB transferred, 87 requests
Info::
Page weighs 4.3 MB (1.0 MB transferred)
Warning::
JavaScript is 920 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 920 KB
Info::
87 HTTP requests
Info::
Estimated 0.22 g CO2 per page load
1.0 MB / 2.4 MB budget
1.0 MB transferred
87 requests
0.22 g CO2 per page load
JavaScript 920.4 KiB 86%
Fonts 53.8 KiB 5%
CSS 37.5 KiB 3%
HTML 29.8 KiB 3%
Other 23.9 KiB 2%
Other 3.5 KiB 0%
Other 2.2 KiB 0%
Other 973 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

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

Why this matters

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

Source: web.dev

B
Page Weight Inventory
87 resources · 1.0 MB · 320 KB savings available
REVIEW
87 resources · 1.0 MB · 320 KB savings available
Warning::
Page weight 48 KB over 1MB target
Got: 1.0 MB Expected: ≤ 1 MB
Info::
~320 KB of savings available
Warning::
86 third-party resources (100% of weight)
Info::
1 resources over 200KB
87 resources · 1.0 MiB · 86 third-party 47.9 KiB over 1MB target
JavaScript 86% · 920.4 KiB
Font 5% · 53.8 KiB
CSS 3% · 37.5 KiB
Document 3% · 31.3 KiB
Image 1% · 15.8 KiB
Other 1% · 13.3 KiB

~320.1 KiB of savings available

Remove unused JavaScript: 320.1 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+
Image Optimization
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (54 KB)
PASS
3 fonts (54 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

54 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.9 s LCP 11.2 shttps://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Roman.woff2SBBWeb-Roman.woff2 https://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Roman.woff2 — 18.0 KiB — 177 ms — font-display: swaphttps://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Bold.woff2SBBWeb-Bold.woff2 https://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Bold.woff2 — 18.1 KiB — 178 ms — font-display: swaphttps://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Light.woff2SBBWeb-Light.woff2 https://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Light.woff2 — 17.7 KiB — 207 ms — font-display: swap
SBBWeb-Roman.woff2 woff2 swap
Size 18 KB
Load time 177 ms
Start 252 ms
Risk FOUT — text flashes from fallback to web font
SBBWeb-Bold.woff2 woff2 swap
Size 18 KB
Load time 178 ms
Start 252 ms
Risk FOUT — text flashes from fallback to web font
SBBWeb-Light.woff2 woff2 swap
Size 18 KB
Load time 207 ms
Start 253 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 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
87 requests over 1522ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.9 s LCP 11.2 shttps://sbb.ch// https://sbb.ch/ — 301 — 568 B — 99 ms — h2https://www.sbb.ch/de/www.sbb.ch/de/ https://www.sbb.ch/de/ — 301 — 999 B — 112 ms — h2https://www.sbb.ch/dewww.sbb.ch/de https://www.sbb.ch/de — 200 — 29.8 KiB — 28 ms — h2https://www.sbb.ch/_next/static/css/821b43fad0c9554d.csswww.sbb.ch/_next/static/css/821b43f... https://www.sbb.ch/_next/static/css/821b43fad0c9554d.css — 200 — 1.2 KiB — 23 ms — h3https://www.sbb.ch/_next/static/css/80ebb8b35699d566.csswww.sbb.ch/_next/static/css/80ebb8b... https://www.sbb.ch/_next/static/css/80ebb8b35699d566.css — 200 — 16.6 KiB — 24 ms — h3https://www.sbb.ch/_next/static/css/ce73a03fb3b6d9e4.csswww.sbb.ch/_next/static/css/ce73a03... https://www.sbb.ch/_next/static/css/ce73a03fb3b6d9e4.css — 200 — 9.4 KiB — 25 ms — h3https://cdn.cookielaw.org/consent/b25bc602-c497-4160-8d7a-f89396557307/OtAutoBlock.jscdn.cookielaw.org/consent/b25bc602-... https://cdn.cookielaw.org/consent/b25bc602-c497-4160-8d7a-f89396557307/OtAutoBlock.js — -1 — 0 B — 65 ms — https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 63 ms — https://www.sbb.ch/_next/static/css/2322f0f9cd834f23.csswww.sbb.ch/_next/static/css/2322f0f... https://www.sbb.ch/_next/static/css/2322f0f9cd834f23.css — 200 — 8.9 KiB — 27 ms — h3https://www.sbb.ch/_next/static/css/4621f8ee26d04398.csswww.sbb.ch/_next/static/css/4621f8e... https://www.sbb.ch/_next/static/css/4621f8ee26d04398.css — 200 — 1.3 KiB — 26 ms — h3https://assets.adobedtm.com/15ff638fdec4/c95c437e4f34/launch-64ab29f9e77a.min.jsassets.adobedtm.com/15ff638fdec4/c9... https://assets.adobedtm.com/15ff638fdec4/c95c437e4f34/launch-64ab29f9e77a.min.js — 200 — 50.7 KiB — 56 ms — h2https://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Roman.woff2cdn.app.sbb.ch/fonts/v1_9_subset/SB... https://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Roman.woff2 — 200 — 18.0 KiB — 177 ms — h2https://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Bold.woff2cdn.app.sbb.ch/fonts/v1_9_subset/SB... https://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Bold.woff2 — 200 — 18.1 KiB — 178 ms — h2https://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Light.woff2cdn.app.sbb.ch/fonts/v1_9_subset/SB... https://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Light.woff2 — 200 — 17.7 KiB — 207 ms — h2https://www.sbb.ch/_next/static/chunks/webpack-16318375d178dc44.jswww.sbb.ch/_next/static/chunks/webp... https://www.sbb.ch/_next/static/chunks/webpack-16318375d178dc44.js — 200 — 2.8 KiB — 24 ms — h3https://www.sbb.ch/_next/static/chunks/4bd1b696-2786e1b9b0fd565e.jswww.sbb.ch/_next/static/chunks/4bd1... https://www.sbb.ch/_next/static/chunks/4bd1b696-2786e1b9b0fd565e.js — 200 — 51.3 KiB — 55 ms — h3https://www.sbb.ch/_next/static/chunks/7934-cb647c66c01a08e9.jswww.sbb.ch/_next/static/chunks/7934... https://www.sbb.ch/_next/static/chunks/7934-cb647c66c01a08e9.js — 200 — 42.0 KiB — 61 ms — h3https://www.sbb.ch/_next/static/chunks/main-app-f38b518aa0496e66.jswww.sbb.ch/_next/static/chunks/main... https://www.sbb.ch/_next/static/chunks/main-app-f38b518aa0496e66.js — 200 — 988 B — 39 ms — h3https://www.sbb.ch/_next/static/chunks/8667-bbe49b61dc300f1e.jswww.sbb.ch/_next/static/chunks/8667... https://www.sbb.ch/_next/static/chunks/8667-bbe49b61dc300f1e.js — 200 — 9.0 KiB — 45 ms — h3https://www.sbb.ch/_next/static/chunks/app/not-found-ee2f8454dc5f93aa.jswww.sbb.ch/_next/static/chunks/app/... https://www.sbb.ch/_next/static/chunks/app/not-found-ee2f8454dc5f93aa.js — 200 — 1.6 KiB — 43 ms — h3https://www.sbb.ch/_next/static/chunks/app/global-error-67be868b8926d1ae.jswww.sbb.ch/_next/static/chunks/app/... https://www.sbb.ch/_next/static/chunks/app/global-error-67be868b8926d1ae.js — 200 — 1.7 KiB — 38 ms — h3https://www.sbb.ch/_next/static/chunks/06f0e697-bbee92d4000b88ae.jswww.sbb.ch/_next/static/chunks/06f0... https://www.sbb.ch/_next/static/chunks/06f0e697-bbee92d4000b88ae.js — 200 — 2.0 KiB — 43 ms — h3https://www.sbb.ch/_next/static/chunks/826-048dc7d7515e7b0e.jswww.sbb.ch/_next/static/chunks/826-... https://www.sbb.ch/_next/static/chunks/826-048dc7d7515e7b0e.js — 200 — 168.1 KiB — 82 ms — h3https://www.sbb.ch/_next/static/chunks/2619-886a83958fa58e87.jswww.sbb.ch/_next/static/chunks/2619... https://www.sbb.ch/_next/static/chunks/2619-886a83958fa58e87.js — 200 — 7.2 KiB — 44 ms — h3https://www.sbb.ch/_next/static/chunks/6416-6146ecf912fb2171.jswww.sbb.ch/_next/static/chunks/6416... https://www.sbb.ch/_next/static/chunks/6416-6146ecf912fb2171.js — 200 — 221.5 KiB — 84 ms — h3https://www.sbb.ch/_next/static/chunks/app/%5Blocale%5D/%5B%5B...slug%5D%5D/page-1a6acf1713a11205.jswww.sbb.ch/_next/static/chunks/app/... https://www.sbb.ch/_next/static/chunks/app/%5Blocale%5D/%5B%5B...slug%5D%5D/page-1a6acf1713a11205.js — 200 — 160.5 KiB — 82 ms — h3https://www.sbb.ch/_next/static/chunks/2566-ffe1f4f22e916d09.jswww.sbb.ch/_next/static/chunks/2566... https://www.sbb.ch/_next/static/chunks/2566-ffe1f4f22e916d09.js — 200 — 65.6 KiB — 65 ms — h3https://www.sbb.ch/_next/static/chunks/app/%5Blocale%5D/%5B%5B...slug%5D%5D/layout-c6a2e4385c522292.jswww.sbb.ch/_next/static/chunks/app/... https://www.sbb.ch/_next/static/chunks/app/%5Blocale%5D/%5B%5B...slug%5D%5D/layout-c6a2e4385c522292.js — 200 — 5.9 KiB — 41 ms — h3https://icons.app.sbb.ch/icons/hamburger-menu-small.svgicons.app.sbb.ch/icons/hamburger-me... https://icons.app.sbb.ch/icons/hamburger-menu-small.svg — 200 — 627 B — 249 ms — h2https://icons.app.sbb.ch/icons/magnifying-glass-small.svgicons.app.sbb.ch/icons/magnifying-g... https://icons.app.sbb.ch/icons/magnifying-glass-small.svg — 200 — 718 B — 248 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.9 s LCP 11.2 shttps://sbb.ch// https://sbb.ch/ — 301 — 568 B — 99 ms — h2https://www.sbb.ch/de/www.sbb.ch/de/ https://www.sbb.ch/de/ — 301 — 999 B — 112 ms — h2https://www.sbb.ch/dewww.sbb.ch/de https://www.sbb.ch/de — 200 — 29.8 KiB — 28 ms — h2https://www.sbb.ch/_next/static/css/821b43fad0c9554d.csswww.sbb.ch/_next/static/css/821b43f... https://www.sbb.ch/_next/static/css/821b43fad0c9554d.css — 200 — 1.2 KiB — 23 ms — h3https://www.sbb.ch/_next/static/css/80ebb8b35699d566.csswww.sbb.ch/_next/static/css/80ebb8b... https://www.sbb.ch/_next/static/css/80ebb8b35699d566.css — 200 — 16.6 KiB — 24 ms — h3https://www.sbb.ch/_next/static/css/ce73a03fb3b6d9e4.csswww.sbb.ch/_next/static/css/ce73a03... https://www.sbb.ch/_next/static/css/ce73a03fb3b6d9e4.css — 200 — 9.4 KiB — 25 ms — h3https://cdn.cookielaw.org/consent/b25bc602-c497-4160-8d7a-f89396557307/OtAutoBlock.jscdn.cookielaw.org/consent/b25bc602-... 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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 3515ms · 787KB · CHF56/mo
www.sbb.ch
Other
Costly
Execution 829ms
Transfer 168 KB
Unused 45%
Monthly Cost CHF13/mo
www.sbb.ch
Other
Costly
Execution 730ms
Transfer 42 KB
Monthly Cost CHF12/mo
www.sbb.ch
Other
Costly
Execution 374ms
Transfer 222 KB
Unused 49%
Monthly Cost CHF6/mo
www.sbb.ch
Other
Costly
Execution 359ms
Transfer 30 KB
Monthly Cost CHF6/mo
www.sbb.ch
Other
Costly
Execution 346ms
Transfer 51 KB
Monthly Cost CHF5/mo
Unattributable
Other
Costly
Execution 287ms
Transfer 0 KB
Monthly Cost CHF5/mo
assets.adobedtm.com
Other
Optional
Execution 151ms
Transfer 51 KB
Monthly Cost CHF2/mo
www.sbb.ch
Other
Optional
Execution 151ms
Transfer 21 KB
Monthly Cost CHF2/mo
www.sbb.ch
Other
Optional
Execution 81ms
Transfer 3 KB
Monthly Cost CHF1/mo
www.sbb.ch
Other
Optional
Execution 80ms
Transfer 161 KB
Unused 50%
Monthly Cost CHF1/mo
siteintercept.qualtrics.com
Other
Optional
Execution 77ms
Transfer 36 KB
Unused 71%
Monthly Cost CHF1/mo
www.sbb.ch
Other
Optional
Execution 51ms
Transfer 3 KB
Monthly Cost CHF1/mo

These scripts may cost more than they're worth

  • www.sbb.ch adds 829ms and costs ~CHF13/month
  • www.sbb.ch adds 730ms and costs ~CHF12/month
  • www.sbb.ch adds 374ms and costs ~CHF6/month
  • www.sbb.ch adds 359ms and costs ~CHF6/month
  • www.sbb.ch adds 346ms and costs ~CHF5/month
  • Unattributable adds 287ms and costs ~CHF5/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.sbb.ch takes 829ms 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.sbb.ch takes 730ms 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.sbb.ch takes 374ms 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.sbb.ch takes 359ms 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.sbb.ch takes 346ms 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 287ms 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

71% of siteintercept.qualtrics.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

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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