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https://www.porsche.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
3
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
39
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.

2.09 s

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

39.29 s

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

2.71 s

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

0.004

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

5.66 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.

39.35 s

Page Load Progression

626 ms
1.3 s
1.9 s
2.5 s
3.1 s
3.8 s
4.4 s
5.0 s
Checks
16
8 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
8.9 MB transferred, 170 requests
FIX
8.9 MB transferred, 170 requests
Critical::
Page weighs 11.2 MB (8.9 MB transferred)
Warning::
Images are 7.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 7.2 MB
Warning::
JavaScript is 798 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 798 KB
Warning::
170 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.9 g CO2 per page load
8.9 MB / 2.4 MB budget
8.9 MB transferred
170 requests
1.9 g CO2 per page load
Images 7.2 MiB 81%
JavaScript 797.7 KiB 9%
Other 733.7 KiB 8%
Fonts 79.2 KiB 1%
Other 43.0 KiB 0%
CSS 26.3 KiB 0%
HTML 24.1 KiB 0%
Other 5.3 KiB 0%
Other 591 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Why this matters

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

Source: web.dev

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
95% third-party, 0 ms blocking
FIX
95% third-party, 0 ms blocking
Warning::
Third-party code accounts for 95% of page weight (8.4 MiB of 8.9 MiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-party
F
JS Execution Cost
Action
8737ms total JS execution
FIX
8737ms total JS execution
Warning::
Unattributable: 1955ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W2N...: 1165ms CPU time
Warning::
https://www.porsche.com/pcom-homepage/_astro/index...: 1165ms CPU time
Warning::
https://cdn.ui.porsche.com/porsche-design-system/c...: 1160ms CPU time
Warning::
https://www.porsche.com/netherlands/nl/?cs_redirec...: 1027ms CPU time
Warning::
Third-party scripts: 4922ms (56% of total)

Main Thread Breakdown

Script Evaluation 50% Other 30% Style & Layout 10% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
Unattributable1955ms271ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W2NKNJZ&l=oneGa1165ms889ms135ms3rd
https://www.porsche.com/pcom-homepage/_astro/index.CuZEeoBo.js1165ms240ms0ms1st
https://cdn.ui.porsche.com/porsche-design-system/components/porsche-design-system.v3.33.0.4258822ed5afd143089d.js1160ms996ms14ms3rd
https://www.porsche.com/netherlands/nl/?cs_redirect=11027ms185ms14ms1st
https://www.porsche.com/all/usercentrics/udg-uc-sdk-pds.min.js394ms283ms85ms1st
https://www.porsche.com/pcom-homepage/_astro/header.astro_astro_type_script_index_0_lang.CYFwQ2UW.js385ms345ms1ms1st
https://www.porsche.com/pcom-homepage/_astro/runtime-dom.esm-bundler.Dgx8DNVv.js381ms329ms0ms1st
https://www.porsche.com/pcom-homepage/_astro/index.Co08kzRY.js337ms293ms0ms1st
https://cdn.ui.porsche.com/porsche-design-system/components/porsche-design-system.v3.31.0.2455cdfb4dfcc42e5299.js243ms222ms16ms3rd

Showing top 10 of 15 scripts

B
Image Optimization
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Info::
All images are well-optimized
32 images 7.2 MB
0 oversized -0 KB
20 legacy format
0 missing dimensions CLS risk
B
JS Bundles
100 scripts, 119 KB unused
REVIEW
100 scripts, 119 KB unused
Warning::
https://nav.porsche.com/00BC524/navigation-drawer/...: 55 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W2N...: 43 KB unused (26%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.porsche.com/pcom-homepage/_astro/PcomV...: 22 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 119 KB
119 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://nav.porsche.com/00BC524/navigation-drawer/p-7b619d7d.entry.js95 KB55 KB (57%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W2NKNJZ&l=oneGa163 KB43 KB (26%)✓3rd
https://www.porsche.com/pcom-homepage/_astro/PcomVideoPlyr.BZFWVEtK.js36 KB22 KB (62%)✓1st
https://cookie.porsche.com/?settingsId=QsW7tMBBMB4azQ2 KB—✓3rd
https://www.porsche.com/all/usercentrics/udg-uc-sdk.min.js1 KB—✓1st
https://www.porsche.com/pcom-homepage/_astro/boot.astro_astro_type_script_index_0_lang.DjZvXPhO.js1 KB—✓1st
https://www.porsche.com/pcom-homepage/_astro/header.astro_astro_type_script_index_0_lang.CYFwQ2UW.js14 KB—✓1st
https://www.porsche.com/pcom-homepage/_astro/footer.astro_astro_type_script_index_0_lang.Dn7TQzRq.js1 KB—✓1st
https://www.porsche.com/pcom-homepage/_astro/DataLayerPageLoad.astro_astro_type_script_index_0_lang.CzTdmN3l.js1 KB—✓1st
https://www.porsche.com/pcom-homepage/_astro/timing.BdHZ65s2.js1 KB—✓1st

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

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
2 fonts (79 KB)
PASS
2 fonts (79 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

79 KB total

Render-blocking

0

of 2

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 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s FCP 2.1 s LCP 39.3 shttps://cdn.ui.porsche.com/porsche-design-system/fonts/porsche-next-latin-regular.b8f1c20.woff2porsche-next-latin-regu... https://cdn.ui.porsche.com/porsche-design-system/fonts/porsche-next-latin-regular.b8f1c20.woff2 — 38.9 KiB — 0 ms — font-display: swaphttps://cdn.ui.porsche.com/porsche-design-system/fonts/porsche-next-latin-semi-bold.b5f6fca.woff2porsche-next-latin-semi... https://cdn.ui.porsche.com/porsche-design-system/fonts/porsche-next-latin-semi-bold.b5f6fca.woff2 — 40.3 KiB — 0 ms — font-display: swap
porsche-next-latin-regu... woff2 swap
Size 39 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
porsche-next-latin-semi... woff2 swap
Size 40 KB
Load time 0 ms
Start 0 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
2
preload
4
dns-prefetch
1
prefetch
—

7 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
A
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=600

DirectiveValueMeaning
max-age600Cache for 10 minutes
Effective TTL: 600 seconds
Network Waterfall
170 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
56% of JavaScript execution is third-party
First-party Third-party 4922ms · 247KB · €53/mo
Unattributable
Other
Costly
Execution 1955ms
Transfer 0 KB
Monthly Cost €21/mo
Google Tag Manager
Tag Manager
Costly
Execution 1165ms
Transfer 163 KB
Unused 26%
Monthly Cost €13/mo
cdn.ui.porsche.com
Other
Costly
Execution 1160ms
Transfer 28 KB
Monthly Cost €13/mo
cdn.ui.porsche.com
Other
Costly
Execution 243ms
Transfer 28 KB
Monthly Cost €3/mo
cdn.ui.porsche.com
Other
Costly
Execution 204ms
Transfer 4 KB
Monthly Cost €2/mo
cookie.porsche.com
Other
Optional
Execution 109ms
Transfer 2 KB
Monthly Cost €1/mo
nav.porsche.com
Other
Optional
Execution 86ms
Transfer 23 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1955ms and costs ~€21/month
  • Google Tag Manager adds 1165ms and costs ~€13/month
  • cdn.ui.porsche.com adds 1160ms and costs ~€13/month
  • cdn.ui.porsche.com adds 243ms and costs ~€3/month
  • cdn.ui.porsche.com adds 204ms and costs ~€2/month

56% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 1955ms 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

Google Tag Manager takes 1165ms 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

cdn.ui.porsche.com takes 1160ms 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

cdn.ui.porsche.com takes 243ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn.ui.porsche.com takes 204ms 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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