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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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Trace the full redirect chain for any URL

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https://www.stichtsevecht.nl

Performance

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

SCORE

86

GRADE

B

FIX

0

REVIEW

9

PASS

11

INFO

4

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

96

Performance

100

Accessibility

100

Best Practices

100

SEO

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

881 ms

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

1.25 s

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.

0.043

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

881 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.

1.29 s

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

24

11 PASS 9 REVIEW

C

Page Weight Budget

Action

1.8 MB transferred, 93 requests

REVIEW

1.8 MB transferred, 93 requests

Page weighs 4.5 MB (1.8 MB transferred)

JavaScript is 526 KB — consider code splitting or lazy loading

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

Got: 526 KB

93 HTTP requests

Estimated 0.38 g CO2 per page load

1.8 MB transferred

93 requests

0.38 g CO2 per page load

Images 983.9 KiB 52%

JavaScript 525.6 KiB 28%

Other 189.7 KiB 10%

CSS 61.6 KiB 3%

Other 48.2 KiB 3%

Fonts 38.4 KiB 2%

HTML 23.8 KiB 1%

Other 4.4 KiB 0%

Other 158 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Approaching limit

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

C

Image Optimization

Action

13 images, 0 KB saveable

REVIEW

13 images, 0 KB saveable

https://www.stichtsevecht.nl/fileadmin/stichtsevec... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

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

Set explicit width and height to prevent CLS.

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

Set explicit width and height to prevent CLS.

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

Set explicit width and height to prevent CLS.

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

Set explicit width and height to prevent CLS.

13 images 984 KB

0 oversized -0 KB

8 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

JS Bundles

20 scripts, 57 KB unused

REVIEW

20 scripts, 57 KB unused

https://stichtsevecht.analytics.opengemeenten.nl/m...: 36 KB unused (54%)

Consider code splitting or tree shaking to reduce unused code.

https://app.tolkie.nl/: 20 KB unused (11%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 57 KB

57 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://stichtsevecht.analytics.opengemeenten.nl/matomo.js	67 KB	36 KB (54%)	✓	3rd
https://app.tolkie.nl/	208 KB	20 KB (11%)	✓	3rd
https://www.stichtsevecht.nl/_assets/355a0888f572c6a9552ca237e8e6848e/Js/OpenGemeentenCalamity-Index.min.js?1794362621	1 KB	—	✓	1st
https://www.stichtsevecht.nl/_assets/36d79b6cbdad6403e41d7d33a7ddf817/Js/OpenGemeentenCmsForm-Form.min.js?1794362621	1 KB	—	✓	1st
https://www.stichtsevecht.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-Focusable.min.js?1794362625	0 KB	—	✓	1st
https://www.stichtsevecht.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-FragmentScroll.min.js?1794362625	1 KB	—	✓	1st
https://www.stichtsevecht.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-Media.min.js?1794362625	2 KB	—	✓	1st
https://www.stichtsevecht.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-PageHeader-Collapsible.min.js?1794362625	1 KB	—	✓	1st
https://www.stichtsevecht.nl/_assets/317130fbcbb12622b6e28e3bfff3cb16/Js/OpenGemeentenSite-Viewport.min.js?1794362625	1 KB	—	✓	1st
https://app-script.monsido.com/v2/monsido-script.js	4 KB	—	✓	3rd

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

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.

C

Page Weight Inventory

Action

93 resources · 1.8 MB · 57 KB savings available

REVIEW

93 resources · 1.8 MB · 57 KB savings available

Page weight 1.8 MB exceeds 1 MB target by 852 KB

Got: 1.8 MB Expected: ≤ 1 MB

~57 KB of savings available

23 third-party resources (39% of weight)

4 resources over 200KB

93 resources · 1.8 MiB · 23 third-party 851.7 KiB over 1MB target

Image 65% · 1.2 MiB

JavaScript 28% · 525.6 KiB

CSS 3% · 61.6 KiB

Font 2% · 38.4 KiB

Document 1% · 26.7 KiB

Other 0% · 3.9 KiB

~56.5 KiB of savings available

Remove unused JavaScript: 56.5 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

93 resources			1.8 MiB

C

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

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

Third-Party Impact

39% third-party, 0 ms blocking

PASS

39% third-party, 0 ms blocking

Third-party code accounts for 39% of page weight (733.8 KiB of 1.8 MiB)

Third-party blocking time is low (0 ms)

61%

39%

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

349ms total JS execution

PASS

349ms total JS execution

https://www.stichtsevecht.nl/: 170ms CPU time

Unattributable: 112ms CPU time

https://app.tolkie.nl/: 67ms CPU time

Third-party scripts: 67ms (19% of total)

Main Thread Breakdown

Other 37% Style & Layout 29% Script Evaluation 22% Rendering 7% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
https://www.stichtsevecht.nl/	170ms	1ms	0ms	1st
Unattributable	112ms	8ms	0ms	1st
https://app.tolkie.nl/	67ms	53ms	1ms	3rd

A+

Font Loading

3 fonts (38 KB)

PASS

3 fonts (38 KB)

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

Web fonts

3

38 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

geist-v3-latin-regular.... woff2 swap

Size 12 KB

Load time 28 ms

Start 366 ms

Risk FOUT — text flashes from fallback to web font

geist-v3-latin-600.woff2 woff2 swap

Size 13 KB

Load time 28 ms

Start 366 ms

Risk FOUT — text flashes from fallback to web font

atkinson-hyperlegible-n... woff2 swap

Size 13 KB

Load time 28 ms

Start 1.1 s

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

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+

Asset Compression

All 1 asset host use brotli

PASS

All 1 asset host use brotli

app.tolkie.nl serves assets with brotli (assets: 3)

Got: app.tolkie.nl (text/css)

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

Network Waterfall

93 requests over 1086ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

19% of JavaScript execution is third-party

First-party Third-party 67ms · 208KB · €1/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
app.tolkie.nl app.tolkie.nl	Other	67ms	208 KB	11%	€1/mo	Optional

app.tolkie.nl

Other

Optional

Execution 67ms

Transfer 208 KB

Unused 11%

Monthly Cost €1/mo

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 (2026-10-14 — 2026-11-10)

LCP (p75)

891 ms

97% good

INP (p75)

71 ms

98% good

CLS (p75)

0.030

94% good

FCP (p75)

856 ms

TTFB (p75)

407 ms

This origin passes Core Web Vitals assessment

Image Optimization

12 images, 607 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

12

Total Size

607 KB

12 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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