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Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
6
PASS
13
INFO
4

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

Mobile Desktop
43
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

5.98 s

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

15.64 s

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

578 ms

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

0.000

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

7.44 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.

15.99 s

Page Load Progression

508 ms
1.0 s
1.5 s
2.0 s
2.5 s
3.0 s
3.6 s
4.1 s
Checks
27
13 PASS 6 REVIEW 4 FIX
F
Page Weight Budget
Action
9.5 MB transferred, 101 requests
FIX
9.5 MB transferred, 101 requests
Critical::
Page weighs 11.8 MB (9.5 MB transferred)
Warning::
Images are 2.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.2 MB
Info::
Fonts are 715 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 715 KB
Warning::
JavaScript is 598 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 598 KB
Warning::
101 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
101 requests
2.0 g CO2 per page load
Other 5.8 MiB 61%
Images 2.2 MiB 23%
Fonts 715.0 KiB 7%
JavaScript 598.3 KiB 6%
Other 224.4 KiB 2%
CSS 48.4 KiB 0%
HTML 22.2 KiB 0%
Other 3.1 KiB 0%
Other 985 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

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

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
65% third-party, 0 ms blocking
FIX
65% third-party, 0 ms blocking
Warning::
Third-party code accounts for 65% of page weight (6.2 MiB of 9.5 MiB)
Info::
Third-party blocking time is low (0 ms)
35%
65%
First-party Third-party
D
JS Execution Cost
Action
3337ms total JS execution
FIX
3337ms total JS execution
Warning::
Unattributable: 858ms CPU time
Warning::
https://www.webasto.com/etc.clientlibs/webasto/cli...: 682ms CPU time
Warning::
https://www.webasto.com/etc.clientlibs/webasto/cli...: 464ms CPU time
Warning::
https://app.usercentrics.eu/browser-ui/3.101.0/ind...: 320ms CPU time
Warning::
https://scripts.clarity.ms/0.8.62/clarity.js: 264ms CPU time
Warning::
Third-party scripts: 1914ms (57% of total)

Main Thread Breakdown

Script Evaluation 61% Other 22% Style & Layout 9% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
Unattributable858ms93ms0ms3rd
https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site.lc-6e01ef64bee544f1920c68a4712fa44f-lc.min.js682ms414ms33ms1st
https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/chunks/3935-3ec8575817bcd34636df.js464ms404ms12ms1st
https://app.usercentrics.eu/browser-ui/3.101.0/index.module.js320ms231ms1ms3rd
https://scripts.clarity.ms/0.8.62/clarity.js264ms217ms6ms3rd
https://assets.adobedtm.com/04196e8f7bcd/74f40dedb607/launch-452613f09356.min.js244ms218ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-11140615971228ms192ms35ms3rd
https://www.webasto.com/en-int.html176ms14ms4ms1st
https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-base.lc-eaf7091298de3b1d12b018828878240a-lc.min.js101ms81ms15ms1st
D
Page Weight Inventory
Action
101 resources · 9.5 MB · 199 KB savings available
FIX
101 resources · 9.5 MB · 199 KB savings available
Warning::
Page weight 9.5 MB exceeds 1 MB target by 8.5 MB
Got: 9.5 MB Expected: ≤ 1 MB
Info::
~199 KB of savings available
Warning::
34 third-party resources (65% of weight)
Info::
5 resources over 200KB
101 resources · 9.5 MiB · 34 third-party 8.5 MiB over 1MB target
Media 61% · 5.8 MiB
Image 23% · 2.2 MiB
Font 7% · 715.0 KiB
JavaScript 6% · 598.3 KiB
Other 2% · 203.3 KiB
CSS 0% · 48.4 KiB
Document 0% · 44.6 KiB

~199.3 KiB of savings available

Remove unused JavaScript: 199.3 KiB
B
Image Optimization
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Info::
All images are well-optimized
24 images 2.2 MB
0 oversized -0 KB
10 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
37 scripts, 199 KB unused
REVIEW
37 scripts, 199 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-111...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.usercentrics.eu/browser-ui/3.101.0/ind...: 55 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.webasto.com/etc.clientlibs/webasto/cli...: 38 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.usercentrics.eu/browser-ui/3.101.0/Vir...: 26 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/04196e8f7bcd/74f40dedb...: 21 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 199 KB
199 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=AW-11140615971147 KB60 KB (41%)✓3rd
https://app.usercentrics.eu/browser-ui/3.101.0/index.module.js121 KB55 KB (46%)✓3rd
https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site.lc-6e01ef64bee544f1920c68a4712fa44f-lc.min.js59 KB38 KB (64%)✓1st
https://app.usercentrics.eu/browser-ui/3.101.0/VirtualServiceItem-ba2ffbd9.js49 KB26 KB (54%)✓3rd
https://assets.adobedtm.com/04196e8f7bcd/74f40dedb607/launch-452613f09356.min.js46 KB21 KB (46%)✓3rd
https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.min.js2 KB—✓3rd
https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/chunks/745-1035fb6e08d9d937c358.js0 KB—✓1st
https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-base.lc-eaf7091298de3b1d12b018828878240a-lc.min.js18 KB—✗1st
https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/chunks/6375-a820979c9731136c85fa.js5 KB—✓1st
https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/chunks/1423-472071f1e9375c66fa77.js3 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

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

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
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
4 fonts (715 KB)
PASS
4 fonts (715 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

715 KB total

Render-blocking

0

of 4

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 FCP 6.0 s LCP 15.6 shttps://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Regular.woff2NotoSans-Regular.woff2 https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Regular.woff2 — 176.8 KiB — 30 ms — font-display: swaphttps://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Black.woff2NotoSans-Black.woff2 https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Black.woff2 — 180.6 KiB — 41 ms — font-display: swaphttps://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Bold.woff2NotoSans-Bold.woff2 https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Bold.woff2 — 174.7 KiB — 15 ms — font-display: swaphttps://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-SemiBold.woff2NotoSans-SemiBold.woff2 https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-SemiBold.woff2 — 182.9 KiB — 18 ms — font-display: swap
NotoSans-Regular.woff2 woff2 swap
Size 177 KB
Load time 30 ms
Start 65 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
NotoSans-Black.woff2 woff2 swap
Size 181 KB
Load time 41 ms
Start 65 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
NotoSans-Bold.woff2 woff2 swap
Size 175 KB
Load time 15 ms
Start 243 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
NotoSans-SemiBold.woff2 woff2 swap
Size 183 KB
Load time 18 ms
Start 244 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)

Fixing the unchecked items could save ~357 KB and ~714 ms

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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Warning::
2 font preload(s) missing `crossorigin` -- font will be downloaded twice
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Regular.woff2, /etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Black.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
—
preload
2
dns-prefetch
—
prefetch
—

2 resource hints configured

Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Regular.woff2, /etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Black.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML max-age=300 (≤ 5min) is appropriate
PASS
Main HTML max-age=300 (≤ 5min) is appropriate
Info::
Main HTML max-age=300 (≤ 5min) is appropriate
Got: max-age=300
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
1 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: max-age=300
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=300

DirectiveValueMeaning
max-age300Cache for 5 minutes
Effective TTL: 300 seconds
Network Waterfall
101 requests over 3563ms
INFO
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 FCP 6.0 s LCP 15.6 shttps://www.webasto.com// https://www.webasto.com/ — 308 — 265 B — 44 ms — h2http://www.webasto.com/en-int.html/en-int.html http://www.webasto.com/en-int.html — 307 — 0 B — 1 ms — http/1.1https://www.webasto.com/en-int.html/en-int.html https://www.webasto.com/en-int.html — 200 — 22.2 KiB — 5 ms — h2https://www.webasto.com/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js/.rum/@adobe/helix-rum-js@%5E2/dist... https://www.webasto.com/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js — 200 — 980 B — 31 ms — h2https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-base.lc-a49e169f41f57a75ecce8c10a244ff9c-lc.min.css/etc.clientlibs/webasto/clientlibs/... https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-base.lc-a49e169f41f57a75ecce8c10a244ff9c-lc.min.css — 200 — 810 B — 7 ms — h2https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Regular.woff2/etc.clientlibs/webasto/clientlibs/... https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Regular.woff2 — 200 — 176.8 KiB — 30 ms — h2https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Black.woff2/etc.clientlibs/webasto/clientlibs/... https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site/resources/fonts/NotoSans-Black.woff2 — 200 — 180.6 KiB — 41 ms — h2https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.js/etc.clientlibs/webasto/clientlibs/... https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.js — 200 — 196 B — 12 ms — h2https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.css/etc.clientlibs/webasto/clientlibs/... https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.css — 200 — 110 B — 16 ms — h2https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site.lc-ec59837a4b843bd0e4642bd7ad302d0c-lc.min.css/etc.clientlibs/webasto/clientlibs/... https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site.lc-ec59837a4b843bd0e4642bd7ad302d0c-lc.min.css — 200 — 47.5 KiB — 21 ms — h2https://www.webasto.com/adobe/dynamicmedia/deliver/dm-aid--822ef68e-a5d5-4625-acc2-7f1dab595802/1-1-feel-the-drive-1st-frame.png?preferwebp=true&width=800&quality=85/adobe/dynamicmedia/deliver/dm-aid-... https://www.webasto.com/adobe/dynamicmedia/deliver/dm-aid--822ef68e-a5d5-4625-acc2-7f1dab595802/1-1-feel-the-drive-1st-frame.png?preferwebp=true&width=800&quality=85 — 200 — 240.3 KiB — 56 ms — h2https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site.lc-6e01ef64bee544f1920c68a4712fa44f-lc.min.js/etc.clientlibs/webasto/clientlibs/... https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-site.lc-6e01ef64bee544f1920c68a4712fa44f-lc.min.js — 200 — 59.3 KiB — 27 ms — h2https://assets.adobedtm.com/04196e8f7bcd/74f40dedb607/launch-452613f09356.min.jsassets.adobedtm.com/04196e8f7bcd/74... https://assets.adobedtm.com/04196e8f7bcd/74f40dedb607/launch-452613f09356.min.js — 200 — 45.6 KiB — 49 ms — http/1.1https://www.webasto.com/etc.clientlibs/core/wcm/components/commons/datalayer/v2/clientlibs/core.wcm.components.commons.datalayer.v2.lc-1e0136bad0acfb78be509234578e44f9-lc.min.js/etc.clientlibs/core/wcm/components... https://www.webasto.com/etc.clientlibs/core/wcm/components/commons/datalayer/v2/clientlibs/core.wcm.components.commons.datalayer.v2.lc-1e0136bad0acfb78be509234578e44f9-lc.min.js — 200 — 1.1 KiB — 19 ms — h2https://www.webasto.com/etc.clientlibs/core/wcm/components/commons/datalayer/acdl/core.wcm.components.commons.datalayer.acdl.lc-bf921af342fd2c40139671dbf0920a1f-lc.min.js/etc.clientlibs/core/wcm/components... https://www.webasto.com/etc.clientlibs/core/wcm/components/commons/datalayer/acdl/core.wcm.components.commons.datalayer.acdl.lc-bf921af342fd2c40139671dbf0920a1f-lc.min.js — 200 — 11.3 KiB — 15 ms — h2https://www.webasto.com/etc.clientlibs/core/wcm/components/commons/site/clientlibs/container.lc-0a6aff292f5cc42142779cde92054524-lc.min.js/etc.clientlibs/core/wcm/components... https://www.webasto.com/etc.clientlibs/core/wcm/components/commons/site/clientlibs/container.lc-0a6aff292f5cc42142779cde92054524-lc.min.js — 200 — 607 B — 21 ms — h2https://www.webasto.com/etc.clientlibs/webasto/clientlibs/clientlib-base.lc-eaf7091298de3b1d12b018828878240a-lc.min.js/etc.clientlibs/webasto/clientlibs/... 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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
57% of JavaScript execution is third-party
First-party Third-party 1914ms · 338KB · €21/mo
Unattributable
Other
Costly
Execution 858ms
Transfer 0 KB
Monthly Cost €9/mo
app.usercentrics.eu
Other
Costly
Execution 320ms
Transfer 121 KB
Unused 46%
Monthly Cost €3/mo
Microsoft Clarity
Session Replay
Costly
Execution 264ms
Transfer 25 KB
Monthly Cost €3/mo
assets.adobedtm.com
Other
Costly
Execution 244ms
Transfer 46 KB
Unused 46%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 228ms
Transfer 147 KB
Unused 41%
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Unattributable adds 858ms and costs ~€9/month
  • app.usercentrics.eu adds 320ms and costs ~€3/month
  • Microsoft Clarity adds 264ms and costs ~€3/month
  • assets.adobedtm.com adds 244ms and costs ~€3/month
  • Google Tag Manager adds 228ms and costs ~€2/month

57% 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 858ms 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 320ms 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

Microsoft Clarity takes 264ms 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

assets.adobedtm.com takes 244ms 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 228ms 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

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-04-11 — 2026-05-08)

LCP (p75)

1258 ms

93% good

INP (p75)

83 ms

96% good

CLS (p75)

0.000

98% good

FCP (p75)

1015 ms

TTFB (p75)

678 ms

This origin passes Core Web Vitals assessment
Image Optimization
45 images, 1296 KB total, 948 KB wasted
INFO

Image Optimization Audit

Total Images

45

Total Size

1296 KB

Oversized

8

Wasted

948 KB

1 missing alt text 10 missing dimensions 7 missing lazy loading
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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