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https://www.porsche.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
3
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
68
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.

515 ms

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

7.47 s

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

167 ms

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

0.056

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

1.77 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.

7.51 s

Page Load Progression

612 ms
1.2 s
1.8 s
2.4 s
3.1 s
3.7 s
4.3 s
4.9 s
Checks
14
6 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
9.5 MB transferred, 184 requests
FIX
9.5 MB transferred, 184 requests
Critical::
Page weighs 11.9 MB (9.5 MB transferred)
Warning::
Images are 7.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 7.4 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::
184 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.0 g CO2 per page load
9.5 MB / 2.4 MB budget
9.5 MB transferred
184 requests
2.0 g CO2 per page load
Images 7.4 MiB 78%
Other 1.1 MiB 12%
JavaScript 797.7 KiB 8%
Fonts 79.2 KiB 1%
Other 43.1 KiB 0%
CSS 26.3 KiB 0%
HTML 24.1 KiB 0%
Other 5.3 KiB 0%
Other 592 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 (9.0 MiB of 9.5 MiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-party
D
JS Execution Cost
Action
2204ms total JS execution
FIX
2204ms total JS execution
Warning::
Unattributable: 614ms CPU time
Warning::
https://www.porsche.com/netherlands/nl/?cs_redirec...: 364ms CPU time
Warning::
https://cdn.ui.porsche.com/porsche-design-system/c...: 298ms CPU time
Info::
https://www.porsche.com/pcom-homepage/_astro/index...: 241ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-W2N...: 229ms CPU time
Warning::
Third-party scripts: 1213ms (55% of total)

Main Thread Breakdown

Script Evaluation 48% Other 30% Style & Layout 11% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
Unattributable614ms85ms0ms3rd
https://www.porsche.com/netherlands/nl/?cs_redirect=1364ms43ms6ms1st
https://cdn.ui.porsche.com/porsche-design-system/components/porsche-design-system.v3.33.0.4258822ed5afd143089d.js298ms256ms4ms3rd
https://www.porsche.com/pcom-homepage/_astro/index.CuZEeoBo.js241ms62ms0ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-W2NKNJZ&l=oneGa229ms192ms30ms3rd
https://www.porsche.com/pcom-homepage/_astro/header.astro_astro_type_script_index_0_lang.CYFwQ2UW.js120ms110ms1ms1st
https://www.porsche.com/all/usercentrics/udg-uc-sdk-pds.min.js97ms74ms16ms1st
https://www.porsche.com/pcom-homepage/_astro/index.Co08kzRY.js93ms82ms0ms1st
https://www.porsche.com/pcom-homepage/_astro/runtime-dom.esm-bundler.Dgx8DNVv.js76ms65ms0ms1st
https://cdn.ui.porsche.com/porsche-design-system/components/porsche-design-system.v3.31.0.2455cdfb4dfcc42e5299.js72ms65ms5ms3rd
B
Image Optimization
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Info::
All images are well-optimized
38 images 7.4 MB
0 oversized -0 KB
14 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 515 ms LCP 7.5 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
184 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
55% of JavaScript execution is third-party
First-party Third-party 1213ms · 218KB · €13/mo
Unattributable
Other
Costly
Execution 614ms
Transfer 0 KB
Monthly Cost €7/mo
cdn.ui.porsche.com
Other
Costly
Execution 298ms
Transfer 28 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 229ms
Transfer 163 KB
Unused 26%
Monthly Cost €2/mo
cdn.ui.porsche.com
Other
Optional
Execution 72ms
Transfer 28 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 614ms and costs ~€7/month
  • cdn.ui.porsche.com adds 298ms and costs ~€3/month
  • Google Tag Manager adds 229ms and costs ~€2/month

55% 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 614ms 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 298ms 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 229ms 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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