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Contrast Checker

Check WCAG color contrast ratios between any two colors

Inspect HTTP response headers for any URL

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https://www.veenendaal.nl

Performance

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

SCORE

90

GRADE

A

FIX

0

REVIEW

6

PASS

13

INFO

4

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

99

Performance

100

Accessibility

100

Best Practices

92

SEO

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

622 ms

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

880 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.

0.046

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

733 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.

886 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

23

13 PASS 6 REVIEW

B

Third-Party Impact

47% third-party, 0 ms blocking

REVIEW

47% third-party, 0 ms blocking

Third-party code accounts for 47% of page weight (465.9 KiB of 995.6 KiB)

Third-party blocking time is low (0 ms)

53%

47%

First-party Third-party

C

Image Optimization

Action

11 images, 0 KB saveable

REVIEW

11 images, 0 KB saveable

https://www.veenendaal.nl/fileadmin/files/Veenenda... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.veenendaal.nl/fileadmin/_processed_/1/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.veenendaal.nl/fileadmin/_processed_/6/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.veenendaal.nl/fileadmin/_processed_/0/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.veenendaal.nl/fileadmin/_processed_/f/... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

11 images 370 KB

0 oversized -0 KB

7 legacy format

5 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

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

Document Compression

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

REVIEW

Document 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

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.

B

HTTP Caching

no-cache

REVIEW

no-cache

Cache-Control header is set

Got: no-cache

ETag present — enables conditional (304) responses

Cache-Control

no-cache

Directive	Value	Meaning
no-cache	—	Cache but always revalidate first

A

Page Weight Budget

996 KB transferred, 88 requests

PASS

996 KB transferred, 88 requests

Page weighs 2.2 MB (996 KB transferred)

88 HTTP requests

Estimated 0.20 g CO2 per page load

996 KB transferred

88 requests

0.20 g CO2 per page load

JavaScript 402.1 KiB 40%

Images 369.6 KiB 37%

Fonts 83.8 KiB 8%

CSS 60.9 KiB 6%

Other 48.2 KiB 5%

HTML 20.7 KiB 2%

Other 6.5 KiB 1%

Other 3.6 KiB 0%

Other 157 B 0%

0 2.4 MB 4.9 MB

Under budget

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

247ms total JS execution

PASS

247ms total JS execution

https://www.veenendaal.nl/: 169ms CPU time

Unattributable: 77ms CPU time

Main Thread Breakdown

Other 41% Style & Layout 33% Script Evaluation 13% Rendering 8% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
https://www.veenendaal.nl/	169ms	1ms	0ms	1st
Unattributable	77ms	4ms	0ms	1st

A+

Font Loading

4 fonts (84 KB)

PASS

4 fonts (84 KB)

4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

84 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

CircularStd-Book.woff2 woff2 swap

Size 25 KB

Load time 28 ms

Start 392 ms

Risk FOUT — text flashes from fallback to web font

CircularStd-Bold.woff2 woff2 swap

Size 28 KB

Load time 28 ms

Start 392 ms

Risk FOUT — text flashes from fallback to web font

basiercircle-bold-webfo... woff2 swap

Size 16 KB

Load time 66 ms

Start 785 ms

Risk FOUT — text flashes from fallback to web font

basiercircle-regular-we... woff2 swap

Size 16 KB

Load time 54 ms

Start 786 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+

JS Bundles

15 scripts, 36 KB unused

PASS

15 scripts, 36 KB unused

https://veenendaal.analytics.opengemeenten.nl/mato...: 36 KB unused (54%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 36 KB

36 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://veenendaal.analytics.opengemeenten.nl/matomo.js	67 KB	36 KB (54%)	✓	3rd
https://www.veenendaal.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-Focusable.min.js?1794362620	0 KB	—	✓	1st
https://www.veenendaal.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-Media.min.js?1794362620	2 KB	—	✓	1st
https://www.veenendaal.nl/_assets/6c3bf359f8df9d9222347f37e2814501/JavaScript/OpenGemeentenSiteSearch-PageHeader-Search.min.js?1794362620	1 KB	—	✓	1st
https://www.veenendaal.nl/_assets/6c3bf359f8df9d9222347f37e2814501/JavaScript/OpenGemeentenSiteSearch-Suggest.min.js?1794362620	2 KB	—	✓	1st
https://www.veenendaal.nl/_assets/f52859db1e4f013bae2a279b52772e55/Js/OpenGemeentenCeFeatureCollapsible.min.js?1794362619	2 KB	—	✓	1st
https://chatwidget-prod.web.app/embed/init.iife.js	11 KB	—	✓	3rd
https://www.veenendaal.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-FragmentScroll.min.js?1794362620	1 KB	—	✓	1st
https://www.veenendaal.nl/typo3temp/assets/js/f0b76d785ab1c527c0e58b0707e81585.js?1794364423	1 KB	—	✓	1st
https://www.veenendaal.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-PageHeader-Collapsible.min.js?1794362620	1 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

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+

Main HTML Cache-Control

Main HTML uses no-cache -- safe revalidate-on-request policy

PASS

Main HTML uses no-cache -- safe revalidate-on-request policy

Main HTML uses no-cache -- safe revalidate-on-request policy

Got: no-cache

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).

`ETag` present -- conditional GET supported

A

Page Weight Inventory

88 resources · 996 KB · 36 KB savings available

PASS

88 resources · 996 KB · 36 KB savings available

Within 1MB page-weight target

Got: 996 KB

22 third-party resources (47% of weight)

1 resources over 200KB

88 resources · 995.6 KiB · 22 third-party Within 1MB page-weight target

Image 42% · 417.7 KiB

JavaScript 40% · 402.1 KiB

Font 8% · 83.8 KiB

CSS 6% · 60.9 KiB

Document 2% · 24.3 KiB

Other 1% · 6.7 KiB

~36.3 KiB of savings available

Remove unused JavaScript: 36.3 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

88 resources			995.6 KiB

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Leaseweb Global BV

Asset Compression

No text asset hosts to measure

INFO

No text asset hosts to measure

No third-party or subdomain host served enough text assets to measure

Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.

Network Waterfall

88 requests over 1491ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

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 (2026-10-14 — 2026-11-10)

LCP (p75)

939 ms

97% good

INP (p75)

67 ms

99% good

CLS (p75)

0.000

97% good

FCP (p75)

893 ms

TTFB (p75)

441 ms

This origin passes Core Web Vitals assessment

Image Optimization

6 images, 195 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

6

Total Size

195 KB

6 missing dimensions 4 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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