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https://sbb.ch

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
86
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.

819 ms

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

2.12 s

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

118 ms

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

0.038

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

1.35 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.

2.12 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 4 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 (1.0 MiB of 1.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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, 91 requests
REVIEW
1.0 MB transferred, 91 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::
91 HTTP requests
Info::
Estimated 0.22 g CO2 per page load
1.0 MB / 2.4 MB budget
1.0 MB transferred
91 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 23.6 KiB 2%
Other 3.6 KiB 0%
Other 2.2 KiB 0%
Other 2.2 KiB 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
JS Execution Cost
707ms total JS execution
REVIEW
707ms total JS execution
Info::
https://www.sbb.ch/_next/static/chunks/826-048dc7d...: 184ms CPU time
Info::
https://www.sbb.ch/_next/static/chunks/7934-cb647c...: 137ms CPU time
Info::
https://www.sbb.ch/de: 120ms CPU time
Info::
https://www.sbb.ch/_next/static/chunks/4bd1b696-27...: 104ms CPU time
Info::
https://www.sbb.ch/_next/static/chunks/6416-6146ec...: 86ms CPU time
Warning::
Third-party scripts: 707ms (100% of total)

Main Thread Breakdown

Script Evaluation 64% Other 14% Script Parsing & Compilation 9% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://www.sbb.ch/_next/static/chunks/826-048dc7d7515e7b0e.js184ms156ms13ms3rd
https://www.sbb.ch/_next/static/chunks/7934-cb647c66c01a08e9.js137ms127ms6ms3rd
https://www.sbb.ch/de120ms1ms2ms3rd
https://www.sbb.ch/_next/static/chunks/4bd1b696-2786e1b9b0fd565e.js104ms96ms7ms3rd
https://www.sbb.ch/_next/static/chunks/6416-6146ecf912fb2171.js86ms70ms15ms3rd
Unattributable77ms11ms0ms3rd
B
Page Weight Inventory
91 resources · 1.0 MB · 320 KB savings available
REVIEW
91 resources · 1.0 MB · 320 KB savings available
Warning::
Page weight 49 KB over 1MB target
Got: 1.0 MB Expected: ≤ 1 MB
Info::
~320 KB of savings available
Warning::
90 third-party resources (100% of weight)
Info::
1 resources over 200KB
91 resources · 1.0 MiB · 90 third-party 49.0 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% · 15.7 KiB
Other 1% · 14.3 KiB

~319.9 KiB of savings available

Remove unused JavaScript: 319.9 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 500 ms 1.0 s 1.5 s 2.0 s FCP 819 ms LCP 2.1 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 — 173 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 — 143 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 — 144 ms — font-display: swap
SBBWeb-Roman.woff2 woff2 swap
Size 18 KB
Load time 173 ms
Start 223 ms
Risk FOUT — text flashes from fallback to web font
SBBWeb-Bold.woff2 woff2 swap
Size 18 KB
Load time 143 ms
Start 224 ms
Risk FOUT — text flashes from fallback to web font
SBBWeb-Light.woff2 woff2 swap
Size 18 KB
Load time 144 ms
Start 224 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
91 requests over 1190ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 819 ms LCP 2.1 shttps://sbb.ch// https://sbb.ch/ — 301 — 568 B — 91 ms — h2https://www.sbb.ch/de/www.sbb.ch/de/ https://www.sbb.ch/de/ — 301 — 998 B — 101 ms — h2https://www.sbb.ch/dewww.sbb.ch/de https://www.sbb.ch/de — 200 — 29.8 KiB — 27 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 — 22 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 — 23 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 — 27 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 — 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 — 26 ms — h3https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 64 ms — https://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 — 15 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 — 173 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 — 143 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 — 144 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 — 23 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 — 60 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 — 57 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 — 987 B — 38 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 — 46 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 — 37 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 — 40 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 — 41 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 — 84 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 — 48 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 — 86 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 — 55 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 — 616 B — 202 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 — 709 B — 201 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 819 ms LCP 2.1 shttps://sbb.ch// https://sbb.ch/ — 301 — 568 B — 91 ms — h2https://www.sbb.ch/de/www.sbb.ch/de/ https://www.sbb.ch/de/ — 301 — 998 B — 101 ms — h2https://www.sbb.ch/dewww.sbb.ch/de https://www.sbb.ch/de — 200 — 29.8 KiB — 27 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 — 22 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 — 23 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 — 27 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 — 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 — 26 ms — h3https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 64 ms — https://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 — 15 ms — h2https://cdn.app.sbb.ch/fonts/v1_9_subset/SBBWeb-Roman.woff2cdn.app.sbb.ch/fonts/v1_9_subset/SB... 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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 707ms · 513KB · CHF11/mo
www.sbb.ch
Other
Optional
Execution 184ms
Transfer 168 KB
Unused 45%
Monthly Cost CHF3/mo
www.sbb.ch
Other
Optional
Execution 137ms
Transfer 42 KB
Monthly Cost CHF2/mo
www.sbb.ch
Other
Optional
Execution 120ms
Transfer 30 KB
Monthly Cost CHF2/mo
www.sbb.ch
Other
Optional
Execution 104ms
Transfer 51 KB
Monthly Cost CHF2/mo
www.sbb.ch
Other
Optional
Execution 86ms
Transfer 222 KB
Unused 49%
Monthly Cost CHF1/mo
Unattributable
Other
Optional
Execution 77ms
Transfer 0 KB
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

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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