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https://siemens.de

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
28
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
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.
83
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.

5.05 s

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

9.35 s

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

2.81 s

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

0.011

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

10.10 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.

24.31 s

Page Load Progression

684 ms
1.4 s
2.1 s
2.7 s
3.4 s
4.1 s
4.8 s
5.5 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.2 MB transferred, 125 requests
FIX
4.2 MB transferred, 125 requests
Critical::
Page weighs 9.4 MB (4.2 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
Fonts are 210 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 210 KB
Warning::
125 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.88 g CO2 per page load
4.2 MB / 2.4 MB budget
4.2 MB transferred
125 requests
0.88 g CO2 per page load
JavaScript 1.5 MiB 36%
Other 1.2 MiB 28%
Images 1.1 MiB 25%
Fonts 210.0 KiB 5%
HTML 102.1 KiB 2%
Other 75.5 KiB 2%
CSS 31.5 KiB 1%
Other 7.7 KiB 0%
Other 480 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over 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

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

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 (4.2 MiB of 4.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
10529ms total JS execution
FIX
10529ms total JS execution
Warning::
https://static.sw.cdn.siemens.com/xd/xd-utils/1.x/...: 2621ms CPU time
Warning::
Unattributable: 2224ms CPU time
Warning::
https://www.siemens.com/de-de/: 1817ms CPU time
Warning::
https://www.siemens.com/lib/helpers/esm/index.modu...: 1450ms CPU time
Warning::
https://metrics.siemens-cdn.com/js/container_UFefy...: 1134ms CPU time
Warning::
Third-party scripts: 10529ms (100% of total)

Main Thread Breakdown

Script Evaluation 61% Other 16% Style & Layout 12% Garbage Collection 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://static.sw.cdn.siemens.com/xd/xd-utils/1.x/xd-utils.min.js2621ms2355ms8ms3rd
Unattributable2224ms1059ms0ms3rd
https://www.siemens.com/de-de/1817ms63ms3ms3rd
https://www.siemens.com/lib/helpers/esm/index.module.js1450ms901ms11ms3rd
https://metrics.siemens-cdn.com/js/container_UFefytkf.js1134ms1040ms53ms3rd
https://w3.siemens.com/ste/ote_config/ote_config.aspx?fct=ste.net_callback347ms330ms0ms3rd
https://app.usercentrics.eu/browser-ui/3.98.1/index.module.js343ms249ms2ms3rd
https://w3.siemens.com/ote/one/ote.js265ms232ms25ms3rd
https://static.sw.cdn.siemens.com/xd/universal-components/1.x/web/2433.js227ms184ms2ms3rd
https://static.sw.cdn.siemens.com/xd/universal-components/1.x/web/7734.js100ms80ms20ms3rd
F
JS Bundles
Action
45 scripts, 968 KB unused
FIX
45 scripts, 968 KB unused
Warning::
https://www.siemens.com/lib/helpers/esm/index.modu...: 808 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.usercentrics.eu/browser-ui/3.98.1/inde...: 54 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://w3.siemens.com/ote/one/ote.js: 42 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.usercentrics.eu/browser-ui/3.98.1/Virt...: 32 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://metrics.siemens-cdn.com/js/container_UFefy...: 31 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 968 KB
968 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.siemens.com/lib/helpers/esm/index.module.js969 KB808 KB (84%)✓3rd
https://app.usercentrics.eu/browser-ui/3.98.1/index.module.js121 KB54 KB (45%)✓3rd
https://w3.siemens.com/ote/one/ote.js98 KB42 KB (44%)✓3rd
https://app.usercentrics.eu/browser-ui/3.98.1/VirtualServiceItem-b82c2a99.js49 KB32 KB (65%)✓3rd
https://metrics.siemens-cdn.com/js/container_UFefytkf.js91 KB31 KB (34%)✓3rd
https://static.sw.cdn.siemens.com/xd/universal-components/1.x/web/4133.js24 KB—✓3rd
https://app.usercentrics.eu/browser-ui/latest/loader.js11 KB—✓3rd
https://data.cdn.siemens.com/?settingsId=GXj83XOdm2 KB—✓3rd
https://www.siemens.com/js/is-land.js1 KB—✓3rd
https://www.siemens.com/siteScripts/analyticsEventBinder.js1 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
Page Weight Inventory
Action
125 resources · 4.2 MB · 968 KB savings available
FIX
125 resources · 4.2 MB · 968 KB savings available
Warning::
Page weight 3.2 MB over 1MB target
Got: 4.2 MB Expected: ≤ 1 MB
Info::
~968 KB of savings available
Warning::
124 third-party resources (100% of weight)
Info::
3 resources over 200KB
125 resources · 4.2 MiB · 124 third-party 3.2 MiB over 1MB target
JavaScript 36% · 1.5 MiB
Other 28% · 1.2 MiB
Image 27% · 1.1 MiB
Font 5% · 210.0 KiB
Document 2% · 102.2 KiB
CSS 1% · 32.0 KiB

~967.6 KiB of savings available

Remove unused JavaScript: 967.6 KiB
C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://images.sw.cdn.siemens.com/siemens-disw-ass... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.sw.cdn.siemens.com/siemens-disw-ass... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.sw.cdn.siemens.com/siemens-disw-ass... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.sw.cdn.siemens.com/siemens-disw-ass... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.sw.cdn.siemens.com/siemens-disw-ass... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 1.1 MB
0 oversized -0 KB
5 legacy format
6 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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
3 fonts (210 KB)
PASS
3 fonts (210 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

210 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 5.0 s LCP 9.3 shttps://static.sw.cdn.siemens.com/fonts/SiemensSans_Prof_Black.woff2SiemensSans_Prof_Black.... https://static.sw.cdn.siemens.com/fonts/SiemensSans_Prof_Black.woff2 — 69.2 KiB — 40 ms — font-display: swaphttps://static.sw.cdn.siemens.com/fonts/SiemensSans_Prof_Roman.woff2SiemensSans_Prof_Roman.... https://static.sw.cdn.siemens.com/fonts/SiemensSans_Prof_Roman.woff2 — 69.2 KiB — 31 ms — font-display: swaphttps://static.sw.cdn.siemens.com/fonts/SiemensSans_Prof_Bold.woff2SiemensSans_Prof_Bold.w... https://static.sw.cdn.siemens.com/fonts/SiemensSans_Prof_Bold.woff2 — 71.6 KiB — 64 ms — font-display: swap
SiemensSans_Prof_Black.... woff2 swap
Size 69 KB
Load time 40 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
SiemensSans_Prof_Roman.... woff2 swap
Size 69 KB
Load time 31 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
SiemensSans_Prof_Bold.w... woff2 swap
Size 72 KB
Load time 64 ms
Start 2.9 s
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
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
A+
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: public, max-age=300
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
Last-Modified header present
Cache-Control

public, max-age=300

DirectiveValueMeaning
public—Any cache may store this response
max-age300Cache for 5 minutes
Effective TTL: 300 seconds
Network Waterfall
125 requests over 5842ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 5.0 s LCP 9.3 shttps://siemens.de// https://siemens.de/ — 301 — 389 B — 334 ms — h2https://www.siemens.de/www.siemens.de/ https://www.siemens.de/ — 301 — 574 B — 905 ms — h2https://www.siemens.com/de/de.htmlwww.siemens.com/de/de.html https://www.siemens.com/de/de.html — 302 — 862 B — 668 ms — h2https://www.siemens.com/de-dewww.siemens.com/de-de https://www.siemens.com/de-de — 302 — 849 B — 629 ms — h2https://www.siemens.com/de-de/www.siemens.com/de-de/ https://www.siemens.com/de-de/ — 200 — 102.1 KiB — 217 ms — h3https://www.siemens.com/styles.csswww.siemens.com/styles.css https://www.siemens.com/styles.css — 200 — 29.8 KiB — 98 ms — h3https://static.sw.cdn.siemens.com/digitalexperiences/search/1.x/searchHeaderVital.cssstatic.sw.cdn.siemens.com/digitalex... https://static.sw.cdn.siemens.com/digitalexperiences/search/1.x/searchHeaderVital.css — 200 — 511 B — 89 ms — h2https://static.sw.cdn.siemens.com/xd/universal-components/1.x/web/index.jsstatic.sw.cdn.siemens.com/xd/univer... https://static.sw.cdn.siemens.com/xd/universal-components/1.x/web/index.js — 200 — 4.6 KiB — 90 ms — h2https://static.sw.cdn.siemens.com/xd/xd-utils/1.x/xd-utils.min.jsstatic.sw.cdn.siemens.com/xd/xd-uti... https://static.sw.cdn.siemens.com/xd/xd-utils/1.x/xd-utils.min.js — 200 — 32.9 KiB — 99 ms — h2https://www.siemens.com/css/styles.csswww.siemens.com/css/styles.css https://www.siemens.com/css/styles.css — 200 — 1.3 KiB — 81 ms — h3https://images.sw.cdn.siemens.com/siemens-disw-assets/public/6mmfnZro4HfiJ2hXnabOlk/en-US/siemens-xcelerator-woman-vr-explore-1080x720.jpg?auto=format,compress&fit=crop&crop=faces,edges&w=1080&h=720&q=60images.sw.cdn.siemens.com/siemens-d... https://images.sw.cdn.siemens.com/siemens-disw-assets/public/6mmfnZro4HfiJ2hXnabOlk/en-US/siemens-xcelerator-woman-vr-explore-1080x720.jpg?auto=format,compress&fit=crop&crop=faces,edges&w=1080&h=720&q=60 — 200 — 26.1 KiB — 125 ms — h2https://images.sw.cdn.siemens.com/siemens-disw-assets/public/wG3p1AhtlqDG4gIJ3DDGb/en-US/brand-evolution-2022-mhero-720x1080.png?auto=format,compress&fit=crop&crop=faces,edges&w=1080&h=720&q=60images.sw.cdn.siemens.com/siemens-d... https://images.sw.cdn.siemens.com/siemens-disw-assets/public/wG3p1AhtlqDG4gIJ3DDGb/en-US/brand-evolution-2022-mhero-720x1080.png?auto=format,compress&fit=crop&crop=faces,edges&w=1080&h=720&q=60 — 200 — 75.5 KiB — 121 ms — h2https://www.siemens.com/js/is-land.jswww.siemens.com/js/is-land.js https://www.siemens.com/js/is-land.js — 200 — 3.7 KiB — 98 ms — h3https://www.siemens.com/siteScripts/analyticsEventBinder.jswww.siemens.com/siteScripts/analyti... https://www.siemens.com/siteScripts/analyticsEventBinder.js — 200 — 2.6 KiB — 70 ms — h3https://api.sw.siemens.com/auth/sessionapi.sw.siemens.com/auth/session https://api.sw.siemens.com/auth/session — 200 — 1.4 KiB — 584 ms — h2https://api.sw.siemens.com/v1/livechat/configuration/www.siemens.comapi.sw.siemens.com/v1/livechat/conf... https://api.sw.siemens.com/v1/livechat/configuration/www.siemens.com — 200 — 527 B — 462 ms — h2https://api.sw.siemens.com/taxonomy/latest/marketplace-countriesapi.sw.siemens.com/taxonomy/latest/... https://api.sw.siemens.com/taxonomy/latest/marketplace-countries — 204 — 0 B — 443 ms — h2https://static.sw.cdn.siemens.com/xd/universal-components/1.x/web/index.jsstatic.sw.cdn.siemens.com/xd/univer... https://static.sw.cdn.siemens.com/xd/universal-components/1.x/web/index.js — 200 — 0 B — 1 ms — h2https://images.sw.cdn.siemens.com/siemens-disw-assets/public/vJOHf8XpFI1Laabz7Bsc8/en-US/opac-group.png?auto=format,compressimages.sw.cdn.siemens.com/siemens-d... https://images.sw.cdn.siemens.com/siemens-disw-assets/public/vJOHf8XpFI1Laabz7Bsc8/en-US/opac-group.png?auto=format,compress — 200 — 1.5 KiB — 38 ms — h2https://images.sw.cdn.siemens.com/siemens-disw-assets/public/2EKyEytfmCkFLU21ABsH1r/en-US/werner-von-siemens-feature-card-1080x720.jpg?auto=format,compress&fit=crop&crop=faces,edges&w=1080&h=720&q=60images.sw.cdn.siemens.com/siemens-d... https://images.sw.cdn.siemens.com/siemens-disw-assets/public/2EKyEytfmCkFLU21ABsH1r/en-US/werner-von-siemens-feature-card-1080x720.jpg?auto=format,compress&fit=crop&crop=faces,edges&w=1080&h=720&q=60 — 200 — 57.4 KiB — 40 ms — h2https://static.sw.cdn.siemens.com/digitalexperiences/utility/1.x/vendor.min.jsstatic.sw.cdn.siemens.com/digitalex... https://static.sw.cdn.siemens.com/digitalexperiences/utility/1.x/vendor.min.js — 200 — 441 B — 22 ms — h2https://static.sw.cdn.siemens.com/digitalexperiences/search/1.x/searchbox.load.jsstatic.sw.cdn.siemens.com/digitalex... https://static.sw.cdn.siemens.com/digitalexperiences/search/1.x/searchbox.load.js — 200 — 1.0 KiB — 23 ms — h2https://data.cdn.siemens.com/?settingsId=GXj83XOdmdata.cdn.siemens.com/?settingsId=GX... https://data.cdn.siemens.com/?settingsId=GXj83XOdm — 200 — 1.7 KiB — 175 ms — h2https://static.sw.cdn.siemens.com/icons/icons-vision.svg?v=2static.sw.cdn.siemens.com/icons/ico... https://static.sw.cdn.siemens.com/icons/icons-vision.svg?v=2 — 200 — 74.7 KiB — 45 ms — h2https://www.siemens.com/img/chevron.svgwww.siemens.com/img/chevron.svg https://www.siemens.com/img/chevron.svg — 200 — 1.3 KiB — 93 ms — h3https://images.sw.cdn.siemens.com/siemens-disw-assets/public/010IENXcvq7BPdNUqWUzgU/en-US/audi-factory-floor-shero-2560x1440.jpg?auto=format%2Ccompress&fit=crop&crop=faces%2Cedges&w=1024&h=1440&q=60images.sw.cdn.siemens.com/siemens-d... https://images.sw.cdn.siemens.com/siemens-disw-assets/public/010IENXcvq7BPdNUqWUzgU/en-US/audi-factory-floor-shero-2560x1440.jpg?auto=format%2Ccompress&fit=crop&crop=faces%2Cedges&w=1024&h=1440&q=60 — 200 — 159.6 KiB — 77 ms — h2https://images.sw.cdn.siemens.com/siemens-disw-assets/public/4pdixNxxEPvZQ1jlOtY6FL/en-US/xcelerator-decoding-future-energy-shero-2560x1440.jpg?auto=format%2Ccompress&fit=crop&crop=faces%2Cedges&w=1024&h=1440&q=60images.sw.cdn.siemens.com/siemens-d... https://images.sw.cdn.siemens.com/siemens-disw-assets/public/4pdixNxxEPvZQ1jlOtY6FL/en-US/xcelerator-decoding-future-energy-shero-2560x1440.jpg?auto=format%2Ccompress&fit=crop&crop=faces%2Cedges&w=1024&h=1440&q=60 — 200 — 36.8 KiB — 32 ms — h2https://images.sw.cdn.siemens.com/siemens-disw-assets/public/1hiCcpREAHFb8fXxrkQBxH/en-US/robot-dog-safety-shero-2560x1440.jpg?auto=format%2Ccompress&fit=crop&crop=faces%2Cedges&w=1024&h=1440&q=60images.sw.cdn.siemens.com/siemens-d... https://images.sw.cdn.siemens.com/siemens-disw-assets/public/1hiCcpREAHFb8fXxrkQBxH/en-US/robot-dog-safety-shero-2560x1440.jpg?auto=format%2Ccompress&fit=crop&crop=faces%2Cedges&w=1024&h=1440&q=60 — 200 — 130.1 KiB — 75 ms — h2https://images.sw.cdn.siemens.com/siemens-disw-assets/public/qd6j45dyXFHDJjKplB9IY/en-US/next-era-gen-ai-report-shero-2560x1440.jpg?auto=format%2Ccompress&fit=crop&crop=faces%2Cedges&w=1024&h=1440&q=60images.sw.cdn.siemens.com/siemens-d... https://images.sw.cdn.siemens.com/siemens-disw-assets/public/qd6j45dyXFHDJjKplB9IY/en-US/next-era-gen-ai-report-shero-2560x1440.jpg?auto=format%2Ccompress&fit=crop&crop=faces%2Cedges&w=1024&h=1440&q=60 — 200 — 161.9 KiB — 69 ms — h2https://images.sw.cdn.siemens.com/siemens-disw-assets/public/44xkQvXrjOekI7Pldy2rZv/en-US/AIEngineeringKeyVisualMaletwoScreens2026.jpg?auto=format,compress&fit=crop&crop=faces,edges&w=96&h=64&q=60images.sw.cdn.siemens.com/siemens-d... https://images.sw.cdn.siemens.com/siemens-disw-assets/public/44xkQvXrjOekI7Pldy2rZv/en-US/AIEngineeringKeyVisualMaletwoScreens2026.jpg?auto=format,compress&fit=crop&crop=faces,edges&w=96&h=64&q=60 — 200 — 2.5 KiB — 73 ms — h2
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https://api.sw.siemens.com/v1/livechat/schedule/false/chatbox/global — 200 — 714 B — 150 ms — h2https://app.usercentrics.eu/browser-ui/3.98.1/VirtualServiceItem-b82c2a99.jsapp.usercentrics.eu/browser-ui/3.98... https://app.usercentrics.eu/browser-ui/3.98.1/VirtualServiceItem-b82c2a99.js — 200 — 48.8 KiB — 36 ms — h3https://app.usercentrics.eu/browser-ui/3.98.1/SaveButton-ffffb102.jsapp.usercentrics.eu/browser-ui/3.98... https://app.usercentrics.eu/browser-ui/3.98.1/SaveButton-ffffb102.js — 200 — 659 B — 36 ms — h3https://app.usercentrics.eu/browser-ui/3.98.1/DefaultTabs-c26ce6a7.jsapp.usercentrics.eu/browser-ui/3.98... https://app.usercentrics.eu/browser-ui/3.98.1/DefaultTabs-c26ce6a7.js — 200 — 1.7 KiB — 33 ms — h3https://siemens.sc.omtrdc.net/b/ss/siemens-x-cl/1/JS-2.20.0/s84622510291323siemens.sc.omtrdc.net/b/ss/siemens-... https://siemens.sc.omtrdc.net/b/ss/siemens-x-cl/1/JS-2.20.0/s84622510291323 — 200 — 387 B — 98 ms — h2https://w3.siemens.com/c2_config.json?url=https%3A%2F%2Fwww.siemens.com%2Fde-de%2Fw3.siemens.com/c2_config.json?url=h... https://w3.siemens.com/c2_config.json?url=https%3A%2F%2Fwww.siemens.com%2Fde-de%2F — 200 — 909 B — 222 ms — h3https://siemens.sc.omtrdc.net/b/ss/siemens-x-cl/1/JS-2.20.0/s81764164878507?AQB=1&ndh=1&pf=1&t=21%2F3%2F2026%2020%3A13%3A9%202%200&D=%7E%7E&vid=d57a4e9f8e6172009564e2d79101227b&aid=d57a4e9f8e6172009564e2d79101227b&ce=UTF-8&cdp=2&pageName=cg%3Aww%3Ade%2Findex&g=https%3A%2F%2Fwww.siemens.com%2Fde-de%2F&cc=USD&ch=cg%7Cww&server=www.siemens.com&events=event84%2Cevent85%3D0.172%2Cevent39%2Cevent131%3D0.008%2Cevent132%3D0%2Cevent133%3D3060%2Cevent134%3D2924%2Cevent135%3D2732.4%2Cevent136%3D0&c1=CM&c2=WW&c3=%7E%7EpageName&v5=%7E%7Ec16&v7=CM&c8=ONE_template&v8=WW&c9=4l2ATvilGJdVPoMnlICZKz&v9=%7E%7Ec8&v11=%7E%7Ec9&c12=%7E%7Ev12&v12=https%3A%2F%2Fwww.siemens.com%2Fde-de%2F&v13=%7E%7EpageName&c14=de&c16=external&v16=logged_out&c20=home&v20=home&c25=consent%3Areqd&v25=%7E%7EUser-Agent&v27=Startseite%20Siemens%20%7C%20Siemens&c30=%7E%7Epev2&v30=%7E%7Epev2&c41=adlytics_A.2.20_2026-03-30.one&c42=siemens-x-cl&v42=%7E%7Evid&c44=script%3A%2F%2Fw3.siemens.com%2Fote%2Fone%2Fote.js&c47=cg%3Aww%3Ade%2Findex&c48=p00&v55=cookielayer.impression&v78=cg%3Aww%3Ade%2Findex&v89=%2F&pe=lnk_o&pev2=cookielayer.impression&s=412x823&c=24&j=1.6&v=N&k=Y&bw=412&bh=823&AQE=1siemens.sc.omtrdc.net/b/ss/siemens-... https://siemens.sc.omtrdc.net/b/ss/siemens-x-cl/1/JS-2.20.0/s81764164878507?AQB=1&ndh=1&pf=1&t=21%2F3%2F2026%2020%3A13%3A9%202%200&D=%7E%7E&vid=d57a4e9f8e6172009564e2d79101227b&aid=d57a4e9f8e6172009564e2d79101227b&ce=UTF-8&cdp=2&pageName=cg%3Aww%3Ade%2Findex&g=https%3A%2F%2Fwww.siemens.com%2Fde-de%2F&cc=USD&ch=cg%7Cww&server=www.siemens.com&events=event84%2Cevent85%3D0.172%2Cevent39%2Cevent131%3D0.008%2Cevent132%3D0%2Cevent133%3D3060%2Cevent134%3D2924%2Cevent135%3D2732.4%2Cevent136%3D0&c1=CM&c2=WW&c3=%7E%7EpageName&v5=%7E%7Ec16&v7=CM&c8=ONE_template&v8=WW&c9=4l2ATvilGJdVPoMnlICZKz&v9=%7E%7Ec8&v11=%7E%7Ec9&c12=%7E%7Ev12&v12=https%3A%2F%2Fwww.siemens.com%2Fde-de%2F&v13=%7E%7EpageName&c14=de&c16=external&v16=logged_out&c20=home&v20=home&c25=consent%3Areqd&v25=%7E%7EUser-Agent&v27=Startseite%20Siemens%20%7C%20Siemens&c30=%7E%7Epev2&v30=%7E%7Epev2&c41=adlytics_A.2.20_2026-03-30.one&c42=siemens-x-cl&v42=%7E%7Evid&c44=script%3A%2F%2Fw3.siemens.com%2Fote%2Fone%2Fote.js&c47=cg%3Aww%3Ade%2Findex&c48=p00&v55=cookielayer.impression&v78=cg%3Aww%3Ade%2Findex&v89=%2F&pe=lnk_o&pev2=cookielayer.impression&s=412x823&c=24&j=1.6&v=N&k=Y&bw=412&bh=823&AQE=1 — 200 — 116 B — 29 ms — h2https://w3.siemens.com/applications/62faba30-51a5-d7bc-2f2e-639eb42ebe5e/js/author-toolbox.min.jsw3.siemens.com/applications/62faba3... https://w3.siemens.com/applications/62faba30-51a5-d7bc-2f2e-639eb42ebe5e/js/author-toolbox.min.js — 200 — 3.2 KiB — 163 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 10529ms · 1466KB · €114/mo
static.sw.cdn.siemens.com
Other
Costly
Execution 2621ms
Transfer 33 KB
Monthly Cost €28/mo
Unattributable
Other
Costly
Execution 2224ms
Transfer 0 KB
Monthly Cost €24/mo
www.siemens.com
Other
Costly
Execution 1817ms
Transfer 102 KB
Monthly Cost €20/mo
www.siemens.com
Other
Costly
Execution 1450ms
Transfer 969 KB
Unused 84%
Monthly Cost €16/mo
metrics.siemens-cdn.com
Other
Costly
Execution 1134ms
Transfer 91 KB
Unused 34%
Monthly Cost €12/mo
w3.siemens.com
Other
Costly
Execution 347ms
Transfer 2 KB
Monthly Cost €4/mo
app.usercentrics.eu
Other
Costly
Execution 343ms
Transfer 121 KB
Unused 45%
Monthly Cost €4/mo
w3.siemens.com
Other
Costly
Execution 265ms
Transfer 98 KB
Unused 44%
Monthly Cost €3/mo
static.sw.cdn.siemens.com
Other
Costly
Execution 227ms
Transfer 8 KB
Monthly Cost €2/mo
static.sw.cdn.siemens.com
Other
Optional
Execution 100ms
Transfer 44 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • static.sw.cdn.siemens.com adds 2621ms and costs ~€28/month
  • Unattributable adds 2224ms and costs ~€24/month
  • www.siemens.com adds 1817ms and costs ~€20/month
  • www.siemens.com adds 1450ms and costs ~€16/month
  • metrics.siemens-cdn.com adds 1134ms and costs ~€12/month
  • w3.siemens.com adds 347ms and costs ~€4/month
  • app.usercentrics.eu adds 343ms and costs ~€4/month
  • w3.siemens.com adds 265ms and costs ~€3/month
  • static.sw.cdn.siemens.com adds 227ms and costs ~€2/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

static.sw.cdn.siemens.com takes 2621ms 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 2224ms 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.siemens.com takes 1817ms 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.siemens.com takes 1450ms 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

84% of www.siemens.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

metrics.siemens-cdn.com takes 1134ms 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

w3.siemens.com takes 347ms 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

app.usercentrics.eu takes 343ms 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

w3.siemens.com takes 265ms 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

static.sw.cdn.siemens.com takes 227ms 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

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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