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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
34
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.

3.31 s

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

7.03 s

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

2.24 s

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

0.028

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

8.77 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.

22.84 s

Page Load Progression

559 ms
1.1 s
1.7 s
2.2 s
2.8 s
3.4 s
3.9 s
4.5 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.1 MB transferred, 124 requests
FIX
4.1 MB transferred, 124 requests
Critical::
Page weighs 9.3 MB (4.1 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::
124 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.87 g CO2 per page load
4.1 MB / 2.4 MB budget
4.1 MB transferred
124 requests
0.87 g CO2 per page load
JavaScript 1.5 MiB 37%
Other 1.1 MiB 28%
Images 1.1 MiB 26%
Fonts 210.0 KiB 5%
HTML 100.7 KiB 2%
Other 75.4 KiB 2%
CSS 31.5 KiB 1%
Other 7.1 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 (4.1 MiB of 4.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
9032ms total JS execution
FIX
9032ms total JS execution
Warning::
https://static.sw.cdn.siemens.com/xd/xd-utils/1.x/...: 2375ms CPU time
Warning::
Unattributable: 2142ms CPU time
Warning::
https://www.siemens.com/en-us/: 1385ms CPU time
Warning::
https://www.siemens.com/lib/helpers/esm/index.modu...: 1229ms CPU time
Warning::
https://metrics.siemens-cdn.com/js/container_UFefy...: 814ms CPU time
Warning::
Third-party scripts: 9032ms (100% of total)

Main Thread Breakdown

Script Evaluation 61% Other 16% Style & Layout 10% Garbage Collection 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://static.sw.cdn.siemens.com/xd/xd-utils/1.x/xd-utils.min.js2375ms2149ms9ms3rd
Unattributable2142ms935ms0ms3rd
https://www.siemens.com/en-us/1385ms108ms3ms3rd
https://www.siemens.com/lib/helpers/esm/index.module.js1229ms738ms14ms3rd
https://metrics.siemens-cdn.com/js/container_UFefytkf.js814ms742ms43ms3rd
https://app.usercentrics.eu/browser-ui/3.98.1/index.module.js315ms231ms1ms3rd
https://w3.siemens.com/ste/ote_config/ote_config.aspx?fct=ste.net_callback262ms240ms0ms3rd
https://w3.siemens.com/ote/one/ote.js251ms220ms25ms3rd
https://static.sw.cdn.siemens.com/xd/universal-components/1.x/web/2433.js172ms119ms2ms3rd
https://static.sw.cdn.siemens.com/xd/universal-components/1.x/web/7734.js87ms70ms17ms3rd
F
JS Bundles
Action
45 scripts, 967 KB unused
FIX
45 scripts, 967 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: 43 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: 967 KB
967 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 KB43 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
124 resources · 4.1 MB · 967 KB savings available
FIX
124 resources · 4.1 MB · 967 KB savings available
Warning::
Page weight 3.1 MB over 1MB target
Got: 4.1 MB Expected: ≤ 1 MB
Info::
~967 KB of savings available
Warning::
123 third-party resources (100% of weight)
Info::
3 resources over 200KB
124 resources · 4.1 MiB · 123 third-party 3.1 MiB over 1MB target
JavaScript 37% · 1.5 MiB
Other 28% · 1.1 MiB
Image 28% · 1.1 MiB
Font 5% · 210.0 KiB
Document 2% · 100.8 KiB
CSS 1% · 31.9 KiB

~967.4 KiB of savings available

Remove unused JavaScript: 967.4 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 FCP 3.3 s LCP 7.0 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 — 44 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 — 34 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 — 30 ms — font-display: swap
SiemensSans_Prof_Black.... woff2 swap
Size 69 KB
Load time 44 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
SiemensSans_Prof_Roman.... woff2 swap
Size 69 KB
Load time 34 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
SiemensSans_Prof_Bold.w... woff2 swap
Size 72 KB
Load time 30 ms
Start 2.2 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
124 requests over 4708ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.3 s LCP 7.0 shttps://siemens.com// https://siemens.com/ — 301 — 765 B — 328 ms — h2https://www.siemens.com/www.siemens.com/ https://www.siemens.com/ — 302 — 401 B — 67 ms — h2https://www.siemens.com/en-us/index.htmlwww.siemens.com/en-us/index.html https://www.siemens.com/en-us/index.html — 301 — 843 B — 1.5 s — h2https://www.siemens.com/en-us/www.siemens.com/en-us/ https://www.siemens.com/en-us/ — 200 — 100.7 KiB — 109 ms — h3https://www.siemens.com/styles.csswww.siemens.com/styles.css https://www.siemens.com/styles.css — 200 — 29.7 KiB — 79 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 — 82 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 — 85 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 — 94 ms — h2https://www.siemens.com/css/styles.csswww.siemens.com/css/styles.css https://www.siemens.com/css/styles.css — 200 — 1.3 KiB — 66 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 — 120 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 — 111 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 — 84 ms — h3https://www.siemens.com/siteScripts/analyticsEventBinder.jswww.siemens.com/siteScripts/analyti... https://www.siemens.com/siteScripts/analyticsEventBinder.js — 200 — 2.6 KiB — 107 ms — h3https://api.sw.siemens.com/auth/sessionapi.sw.siemens.com/auth/session https://api.sw.siemens.com/auth/session — 200 — 1.4 KiB — 533 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 — 422 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 — 385 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 — 2 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 — 33 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 — 442 B — 24 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 — 25 ms — h2https://data.cdn.siemens.com/?settingsId=GXj83XOdmdata.cdn.siemens.com/?settingsId=GX... https://data.cdn.siemens.com/?settingsId=GXj83XOdm — 200 — 1.7 KiB — 136 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 — 43 ms — h2https://www.siemens.com/img/chevron.svgwww.siemens.com/img/chevron.svg https://www.siemens.com/img/chevron.svg — 200 — 1.3 KiB — 80 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 — 159.7 KiB — 50 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 — 55 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 — 130.0 KiB — 73 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 — 67 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 — 55 ms — h2https://static.sw.cdn.siemens.com/fonts/SiemensSans_Prof_Black.woff2static.sw.cdn.siemens.com/fonts/Sie... https://static.sw.cdn.siemens.com/fonts/SiemensSans_Prof_Black.woff2 — 200 — 69.2 KiB — 44 ms — h2
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h3https://siemens.sc.omtrdc.net/b/ss/siemens-x-cl/1/JS-2.20.0/s89421515810199?AQB=1&ndh=1&pf=1&t=21%2F3%2F2026%2019%3A6%3A57%202%200&D=%7E%7E&vid=fb4d102351c81aa91038ecb8b5642e17&aid=fb4d102351c81aa91038ecb8b5642e17&ce=UTF-8&cdp=2&pageName=cg%3Aww%3Aen%2Findex&g=https%3A%2F%2Fwww.siemens.com%2Fen-us%2F&cc=USD&ch=cg%7Cww&server=www.siemens.com&events=event84%2Cevent85%3D0.112%2Cevent39%2Cevent131%3D0.008%2Cevent132%3D0%2Cevent133%3D2276%2Cevent134%3D2164%2Cevent135%3D1991.2%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%2Fen-us%2F&v13=%7E%7EpageName&c14=en&c16=external&v16=logged_out&c20=home&v20=home&c25=consent%3Areqd&v25=%7E%7EUser-Agent&v27=Siemens%20home%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%3Aen%2Findex&c48=p00&v55=cookielayer.impression&v78=cg%3Aww%3Aen%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/s89421515810199?AQB=1&ndh=1&pf=1&t=21%2F3%2F2026%2019%3A6%3A57%202%200&D=%7E%7E&vid=fb4d102351c81aa91038ecb8b5642e17&aid=fb4d102351c81aa91038ecb8b5642e17&ce=UTF-8&cdp=2&pageName=cg%3Aww%3Aen%2Findex&g=https%3A%2F%2Fwww.siemens.com%2Fen-us%2F&cc=USD&ch=cg%7Cww&server=www.siemens.com&events=event84%2Cevent85%3D0.112%2Cevent39%2Cevent131%3D0.008%2Cevent132%3D0%2Cevent133%3D2276%2Cevent134%3D2164%2Cevent135%3D1991.2%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%2Fen-us%2F&v13=%7E%7EpageName&c14=en&c16=external&v16=logged_out&c20=home&v20=home&c25=consent%3Areqd&v25=%7E%7EUser-Agent&v27=Siemens%20home%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%3Aen%2Findex&c48=p00&v55=cookielayer.impression&v78=cg%3Aww%3Aen%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 — 26 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 — 63 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 9032ms · 1464KB · $120/mo
static.sw.cdn.siemens.com
Other
Costly
Execution 2375ms
Transfer 33 KB
Monthly Cost $32/mo
Unattributable
Other
Costly
Execution 2142ms
Transfer 0 KB
Monthly Cost $28/mo
www.siemens.com
Other
Costly
Execution 1385ms
Transfer 101 KB
Monthly Cost $18/mo
www.siemens.com
Other
Costly
Execution 1229ms
Transfer 969 KB
Unused 84%
Monthly Cost $16/mo
metrics.siemens-cdn.com
Other
Costly
Execution 814ms
Transfer 91 KB
Unused 34%
Monthly Cost $11/mo
app.usercentrics.eu
Other
Costly
Execution 315ms
Transfer 121 KB
Unused 45%
Monthly Cost $4/mo
w3.siemens.com
Other
Costly
Execution 262ms
Transfer 2 KB
Monthly Cost $3/mo
w3.siemens.com
Other
Costly
Execution 251ms
Transfer 98 KB
Unused 44%
Monthly Cost $3/mo
static.sw.cdn.siemens.com
Other
Optional
Execution 172ms
Transfer 8 KB
Monthly Cost $2/mo
static.sw.cdn.siemens.com
Other
Optional
Execution 87ms
Transfer 44 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • static.sw.cdn.siemens.com adds 2375ms and costs ~$32/month
  • Unattributable adds 2142ms and costs ~$28/month
  • www.siemens.com adds 1385ms and costs ~$18/month
  • www.siemens.com adds 1229ms and costs ~$16/month
  • metrics.siemens-cdn.com adds 814ms and costs ~$11/month
  • app.usercentrics.eu adds 315ms and costs ~$4/month
  • w3.siemens.com adds 262ms and costs ~$3/month
  • w3.siemens.com adds 251ms and costs ~$3/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 2375ms 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 2142ms 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 1385ms 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 1229ms 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 814ms 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 315ms 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 262ms 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 251ms 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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