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https://hillegom.nl

Performance

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

SCORE

80

GRADE

B

FIX

4

REVIEW

5

PASS

11

INFO

4

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

99

Performance

100

Accessibility

96

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.

406 ms

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

899 ms

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

42 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.

1.03 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.

3.50 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 5 REVIEW 4 FIX

F

Page Weight Budget

Action

4.3 MB transferred, 78 requests

FIX

4.3 MB transferred, 78 requests

Page weighs 6.7 MB (4.3 MB transferred)

Images are 2.1 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 2.1 MB

JavaScript is 1.9 MB — consider code splitting or lazy loading

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

Got: 1.9 MB

Fonts are 246 KB — consider subsetting or using system fonts

Subset fonts to include only used characters, or switch to system font stacks.

Got: 246 KB

78 HTTP requests

Estimated 0.89 g CO2 per page load

4.3 MB transferred

78 requests

0.89 g CO2 per page load

Images 2.1 MiB 48%

JavaScript 1.9 MiB 44%

Fonts 246.5 KiB 6%

CSS 81.2 KiB 2%

HTML 25.7 KiB 1%

Other 1.9 KiB 0%

Other 1.9 KiB 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

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

D

JS Bundles

Action

15 scripts, 450 KB unused

FIX

15 scripts, 450 KB unused

https://virtuele-gemeente-assistent.nl/static/js/i...: 377 KB unused (22%)

Consider code splitting or tree shaking to reduce unused code.

https://hillegom.nl/wp-content/themes/owc-starter/...: 52 KB unused (73%)

Consider code splitting or tree shaking to reduce unused code.

https://hillegom.nl/wp/wp-includes/js/jquery/jquer...: 21 KB unused (71%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 450 KB

450 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://virtuele-gemeente-assistent.nl/static/js/ida-widget.js	1719 KB	377 KB (22%)	✓	3rd
https://hillegom.nl/wp-content/themes/owc-starter/dist/client.js?id=bfa6a2af0eb7545537b4abc0f366c9cb&ver=0.1.0	71 KB	52 KB (73%)	✓	1st
https://hillegom.nl/wp/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	30 KB	21 KB (71%)	✓	1st
https://openpub.hltsamen.nl/wp/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375	2 KB	—	✓	3rd
https://hillegom.nl/wp-content/plugins/acato-deepl/build/deepl.js?ver=1.5.0	6 KB	—	✓	1st
https://openpub.hltsamen.nl/wp/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1	2 KB	—	✓	3rd
https://hillegom.nl/wp-content/plugins/wp-smartcrop/js/jquery.wp-smartcrop.min.js?ver=2.0.10	2 KB	—	✓	1st
https://meldingen.hollandsmiddenveilig.nl/public/widget/b59d64059d5a99d1655db21949146f1f.js	1 KB	—	✓	3rd
https://cdn-eu.readspeaker.com/script/9342/webReader/webReader.js?pids=wr&ver=0.1.0	28 KB	—	✓	3rd
https://openpub.hltsamen.nl/wp/wp-includes/js/dist/vendor/lodash.min.js?ver=4.17.21	25 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

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

F

Page Weight Inventory

Action

78 resources · 4.3 MB · 450 KB savings available

FIX

78 resources · 4.3 MB · 450 KB savings available

Page weight 4.3 MB exceeds 1 MB target by 3.3 MB

Got: 4.3 MB Expected: ≤ 1 MB

~450 KB of savings available

12 third-party resources (42% of weight)

7 resources over 200KB

78 resources · 4.3 MiB · 12 third-party 3.3 MiB over 1MB target

Image 48% · 2.1 MiB

JavaScript 44% · 1.9 MiB

Font 6% · 246.5 KiB

CSS 2% · 81.2 KiB

Document 1% · 25.7 KiB

Other 0% · 1.9 KiB

~449.8 KiB of savings available

Remove unused JavaScript: 449.8 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

78 resources			4.3 MiB

D

HTTP Caching

Action

no-store (uncacheable)

FIX

no-store (uncacheable)

Cache-Control: no-store prevents all caching

Intentional for dynamic content, but increases server load for every page view.

Got: no-store, no-cache, must-revalidate

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

no-store, no-cache, must-revalidate

Directive	Value	Meaning
no-store	—	Never cache this response
no-cache	—	Cache but always revalidate first
must-revalidate	—	Must recheck with server after expiry

B

Third-Party Impact

42% third-party, 0 ms blocking

REVIEW

42% third-party, 0 ms blocking

Third-party code accounts for 42% of page weight (1.8 MiB of 4.3 MiB)

Third-party blocking time is low (0 ms)

58%

42%

First-party Third-party

B

Image Optimization

18 images, 0 KB saveable

REVIEW

18 images, 0 KB saveable

All images are well-optimized

18 images 2.1 MB

0 oversized -0 KB

16 legacy format

0 missing dimensions CLS risk

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.

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

321ms total JS execution

PASS

321ms total JS execution

https://virtuele-gemeente-assistent.nl/static/js/i...: 135ms CPU time

https://hillegom.nl/: 106ms CPU time

Unattributable: 80ms CPU time

Third-party scripts: 135ms (42% of total)

Main Thread Breakdown

Script Evaluation 31% Other 24% Style & Layout 19% Script Parsing & Compilation 18% Rendering 4% Parse HTML & CSS 3%

Script	Total	Scripting	Parse/Compile	Party
https://virtuele-gemeente-assistent.nl/static/js/ida-widget.js	135ms	72ms	63ms	3rd
https://hillegom.nl/	106ms	3ms	1ms	1st
Unattributable	80ms	2ms	0ms	1st

A+

Font Loading

4 fonts (246 KB)

PASS

4 fonts (246 KB)

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

Web fonts

4

246 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

Overpass-Regular.woff2 woff2 swap

Size 60 KB

Load time 101 ms

Start 1.0 s

Risk FOUT — text flashes from fallback to web font

Overpass-Medium.woff2 woff2 swap

Size 62 KB

Load time 104 ms

Start 1.0 s

Risk FOUT — text flashes from fallback to web font

Overpass-SemiBold.woff2 woff2 swap

Size 62 KB

Load time 109 ms

Start 1.0 s

Risk FOUT — text flashes from fallback to web font

Overpass-Bold.woff2 woff2 swap

Size 62 KB

Load time 109 ms

Start 1.0 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

1 of 1 asset host still on gzip

PASS

1 of 1 asset host still on gzip

cdn-eu.readspeaker.com serves assets with gzip; brotli would be ~20% smaller (assets: 3)

Every current browser accepts brotli. On a CDN this is a per-pull-zone toggle (Cloudflare, Fastly, CloudFront, CDN77, Bunny all expose it); on an origin it needs the brotli module (nginx-brotli, Apache mod_brotli). The saving lands on the assets this host serves, not on the HTML document -- the document's own encoding is reported separately.

Got: cdn-eu.readspeaker.com (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-store -- correct for sensitive/dynamic content

PASS

Main HTML uses no-store -- correct for sensitive/dynamic content

Main HTML uses no-store -- correct for sensitive/dynamic content

Got: no-store, no-cache, must-revalidate

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: Accept-Encoding,User-Agent

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+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Previder BV

Network Waterfall

78 requests over 1625ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

42% of JavaScript execution is third-party

First-party Third-party 135ms · 1719KB · €1/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
virtuele-gemeente-assistent.nl virtuele-gemeente-assistent.nl	Other	135ms	1719 KB	22%	€1/mo	Optional

virtuele-gemeente-assistent.nl

Other

Optional

Execution 135ms

Transfer 1719 KB

Unused 22%

Monthly Cost €1/mo

42% 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

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)

1532 ms

95% good

INP (p75)

80 ms

96% good

CLS (p75)

0.000

98% good

FCP (p75)

1421 ms

TTFB (p75)

0 ms

This origin passes Core Web Vitals assessment

Image Optimization

15 images, 2094 KB total, 962 KB wasted

INFO

Image Optimization Audit

Total Images

15

Total Size

2094 KB

Oversized

6

Wasted

962 KB

9 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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