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Contrast Checker

Check WCAG color contrast ratios between any two colors

Inspect HTTP response headers for any URL

Analyze SSL/TLS certificate details and chain

Look up DNS records for any domain

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https://bilerne.dk

Performance

· 21 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

92

GRADE

A

FIX

1

REVIEW

6

PASS

12

INFO

2

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

100

Performance

45

Accessibility

62

Best Practices

83

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

406 ms

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

673 ms

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

0 ms

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

0.044

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

436 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

673 ms

Page Load Progression

375 ms

750 ms

1.1 s

1.5 s

1.9 s

2.2 s

2.6 s

3.0 s

Checks

21

12 PASS 6 REVIEW 1 FIX

F

HTTP Caching

Action

No cache headers

FIX

No cache headers

No Cache-Control header found

Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C

Image Optimization

Action

31 images, 0 KB saveable

REVIEW

31 images, 0 KB saveable

https://img.tradedoubler.com/images/uk/merchants/a... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://bilerne.dk/images/box_up_hoj.gif is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://bilerne.dk/images/box_down_hoj.gif is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://bilerne.dk/images/nosponsor.gif is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://img.tradedoubler.com/images/dk/100px_logo/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://bilerne.dk/images/bottom.jpg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://bilerne.dk/images/box_down_ven.gif is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://bilerne.dk/images/left_top.jpg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://hst.tradedoubler.com/file/49424/dba_logo_2... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://bilerne.dk/images/supercars.gif is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://img.tradedoubler.com/images/dk/100px_logo/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://bilerne.dk/images/box_up_ven.gif is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://bilerne.dk/images/left.jpg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://bilerne.dk/images/right.jpg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

31 images 40 KB

0 oversized -0 KB

30 legacy format

14 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

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

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

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

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

B

HTTP/3 (QUIC)

HTTP/3 not advertised

REVIEW

HTTP/3 not advertised

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.

B

Compression Algorithm

Main response uses gzip; brotli would be ~20% smaller

REVIEW

Main response uses gzip; brotli would be ~20% smaller

Main HTML response uses gzip (brotli would be ~20% smaller)

All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.

B

Main HTML Cache-Control

No Cache-Control header on main HTML response

REVIEW

No Cache-Control header on main HTML response

Main HTML response has no Cache-Control header

Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.

B

Server-Timing Observability

No Server-Timing header found

REVIEW

No Server-Timing header found

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+

Page Weight Budget

50 KB transferred, 34 requests

PASS

50 KB transferred, 34 requests

Page weighs 66 KB (50 KB transferred)

34 HTTP requests

Estimated 0.01 g CO2 per page load

50 KB transferred

34 requests

0.01 g CO2 per page load

Images 40.1 KiB 80%

Other 5.3 KiB 11%

HTML 4.6 KiB 9%

JavaScript 0 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

13% third-party, 0 ms blocking

PASS

13% third-party, 0 ms blocking

Third-party code accounts for 13% of page weight (6.3 KiB of 50.0 KiB)

Third-party blocking time is low (0 ms)

87%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are compressed

All text resources are properly compressed.

A+

JS Execution Cost

132ms total JS execution

PASS

132ms total JS execution

https://bilerne.dk/: 77ms CPU time

Unattributable: 56ms CPU time

Main Thread Breakdown

Other 55% Style & Layout 20% Rendering 16% Script Evaluation 5% Parse HTML & CSS 3%

Script	Total	Scripting	Parse/Compile	Party
https://bilerne.dk/	77ms	4ms	0ms	1st
Unattributable	56ms	2ms	0ms	1st

A+

Font Loading

No web fonts (system fonts)

PASS

No web fonts (system fonts)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

A+

JS Bundles

1 scripts, 0 KB unused

PASS

1 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
http://impdk.tradedoubler.com/imp?type(js)g(19887706)a(1025657)111104172	0 KB	—	✓	3rd

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

LCP image preload audit not available for this scan

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: Accept-Encoding

The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).

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+

Page Weight Inventory

34 resources · 50 KB · 0 KB savings available

PASS

34 resources · 50 KB · 0 KB savings available

Within 1MB page-weight target

Got: 50 KB

5 third-party resources (13% of weight)

34 resources · 50.0 KiB · 5 third-party Within 1MB page-weight target

Image 80% · 40.1 KiB

Document 20% · 9.9 KiB

JavaScript 0% · 0 B

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

34 resources			50.0 KiB

Network Waterfall

34 requests over 590ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

48 images, 22 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

48

Total Size

22 KB

48 missing alt text 32 missing dimensions 29 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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