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https://haarlemmermeergemeente.nl

Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
4
REVIEW
6
PASS
9
INFO
4

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

Mobile Desktop
88
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.
100
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.

749 ms

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

2.07 s

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

104 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.

1.01 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.

2.22 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
23
9 PASS 6 REVIEW 4 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 43 requests
FIX
2.2 MB transferred, 43 requests
Info::
Page weighs 4.8 MB (2.2 MB transferred)
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Warning::
JavaScript is 805 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 805 KB
Info::
43 HTTP requests
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
43 requests
0.46 g CO2 per page load
Images 1.1 MiB 52%
JavaScript 804.6 KiB 36%
Fonts 198.6 KiB 9%
HTML 35.9 KiB 2%
Other 24.2 KiB 1%
Other 7.0 KiB 0%
CSS 1.0 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

D
JS Bundles
Action
20 scripts, 403 KB unused
FIX
20 scripts, 403 KB unused
Warning::
https://haarlemmermeergemeente.nl/_next/static/chu...: 279 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://siteimproveanalytics.com/js/siteanalyze_60...: 78 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://haarlemmermeer1.expoints.nl/m/Scripts/dist...: 25 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.mailplus.nl/jq/jquery.validate.1.19...: 20 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 403 KB
403 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://haarlemmermeergemeente.nl/_next/static/chunks/pages/_app-147da3600acbd0f8.js450 KB279 KB (62%)✓1st
https://siteimproveanalytics.com/js/siteanalyze_6006057.js112 KB78 KB (70%)✓3rd
https://haarlemmermeer1.expoints.nl/m/Scripts/dist/expoints-external.min.js?lv=137 KB25 KB (68%)✓3rd
https://static.mailplus.nl/jq/jquery.validate.1.19.3.min.js24 KB20 KB (84%)✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js31 KB—✓3rd
https://haarlemmermeergemeente.nl/_next/static/chunks/main-4fbe98809c211867.js44 KB—✓1st
https://haarlemmermeergemeente.nl/_next/static/chunks/86513-cc0889b9865a192f.js5 KB—✓1st
https://haarlemmermeergemeente.nl/_next/static/chunks/pages/index-090c47fe6f1f6390.js2 KB—✓1st
https://haarlemmermeergemeente.nl/_next/static/2eb89e06/_buildManifest.js1 KB—✓1st
https://haarlemmermeergemeente.nl/_next/static/chunks/webpack-ffb387e711e5bb7b.js19 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

D
Page Weight Inventory
Action
43 resources · 2.2 MB · 403 KB savings available
FIX
43 resources · 2.2 MB · 403 KB savings available
Warning::
Page weight 2.2 MB exceeds 1 MB target by 1.2 MB
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~403 KB of savings available
Info::
15 third-party resources (16% of weight)
Info::
2 resources over 200KB
43 resources · 2.2 MiB · 15 third-party 1.2 MiB over 1MB target
Image 52% · 1.1 MiB
JavaScript 36% · 805.3 KiB
Font 9% · 198.6 KiB
Document 2% · 35.9 KiB
Other 1% · 24.2 KiB
CSS 0% · 1.0 KiB

~402.5 KiB of savings available

Remove unused JavaScript: 402.5 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store

DirectiveValueMeaning
no-store—Never cache this response
B
Image Optimization
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://haarlemmermeergemeente.nl/images/infor-mee... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://haarlemmermeergemeente.nl/images/logo53568... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 1.1 MB
0 oversized -0 KB
4 legacy format
2 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

B
JS Execution Cost
761ms total JS execution
REVIEW
761ms total JS execution
Warning::
https://haarlemmermeergemeente.nl/_next/static/chu...: 335ms CPU time
Info::
https://haarlemmermeergemeente.nl/_next/static/chu...: 198ms CPU time
Info::
https://haarlemmermeergemeente.nl/: 129ms CPU time
Info::
Unattributable: 99ms CPU time

Main Thread Breakdown

Script Evaluation 63% Other 13% Style & Layout 9% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://haarlemmermeergemeente.nl/_next/static/chunks/framework-cfa9730c0b361aa8.js335ms296ms3ms1st
https://haarlemmermeergemeente.nl/_next/static/chunks/pages/_app-147da3600acbd0f8.js198ms153ms45ms1st
https://haarlemmermeergemeente.nl/129ms11ms3ms1st
Unattributable99ms2ms0ms1st
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
Document Compression
Action
Document response served uncompressed
REVIEW
Document 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+
Third-Party Impact
16% third-party, 0 ms blocking
PASS
16% third-party, 0 ms blocking
Info::
Third-party code accounts for 16% of page weight (368.4 KiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
84%
16%
First-party Third-party
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 (199 KB)
PASS
4 fonts (199 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

199 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 500 ms 1.0 s 1.5 s 2.0 s FCP 749 ms LCP 2.1 shttps://haarlemmermeergemeente.nl/fonts/axiforma-40041f0f2625da6ff8c.woff2axiforma-40041f0f2625da... https://haarlemmermeergemeente.nl/fonts/axiforma-40041f0f2625da6ff8c.woff2 — 24.5 KiB — 44 ms — font-display: swaphttps://haarlemmermeergemeente.nl/fonts/axiforma-60057102fa41388ade4.woff2axiforma-60057102fa4138... https://haarlemmermeergemeente.nl/fonts/axiforma-60057102fa41388ade4.woff2 — 25.0 KiB — 99 ms — font-display: swaphttps://haarlemmermeergemeente.nl/fonts/axiforma-400-italiccd7a38e61cdab687.woff2axiforma-400-italiccd7a... https://haarlemmermeergemeente.nl/fonts/axiforma-400-italiccd7a38e61cdab687.woff2 — 26.8 KiB — 36 ms — font-display: swaphttps://haarlemmermeer1.expoints.nl/m/content/dist/files/Haarlemmermeer_Axiforma_Regular.ttfHaarlemmermeer_Axiforma... https://haarlemmermeer1.expoints.nl/m/content/dist/files/Haarlemmermeer_Axiforma_Regular.ttf — 122.4 KiB — 123 ms — font-display: swap
axiforma-40041f0f2625da... woff2 swap
Size 24 KB
Load time 44 ms
Start 125 ms
Risk FOUT — text flashes from fallback to web font
axiforma-60057102fa4138... woff2 swap
Size 25 KB
Load time 99 ms
Start 125 ms
Risk FOUT — text flashes from fallback to web font
axiforma-400-italiccd7a... woff2 swap
Size 27 KB
Load time 36 ms
Start 342 ms
Risk FOUT — text flashes from fallback to web font
Haarlemmermeer_Axiforma... ttf swap
Size 122 KB
Load time 123 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • 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 ~98 KB and ~196 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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 uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: no-store
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.
Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
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
43 requests over 1379ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 749 ms LCP 2.1 shttps://haarlemmermeergemeente.nl// https://haarlemmermeergemeente.nl/ — 200 — 35.9 KiB — 142 ms — h2https://haarlemmermeergemeente.nl/fonts/axiforma-40041f0f2625da6ff8c.woff2/fonts/axiforma-40041f0f2625da6ff8c... https://haarlemmermeergemeente.nl/fonts/axiforma-40041f0f2625da6ff8c.woff2 — 200 — 24.5 KiB — 44 ms — h2https://haarlemmermeergemeente.nl/fonts/axiforma-60057102fa41388ade4.woff2/fonts/axiforma-60057102fa41388ade4... https://haarlemmermeergemeente.nl/fonts/axiforma-60057102fa41388ade4.woff2 — 200 — 25.0 KiB — 99 ms — h2https://haarlemmermeergemeente.nl/_next/image?url=http%3A%2F%2Fdvg-backend-httpd%2Fsites%2Fhaarlemmermeer%2Ffiles%2Fstyles%2Fopen_online_16_9%2Fpublic%2F2022-11%2F1-home_79A2745_bewerkt-min%20(1).jpg%3Fh%3D98c5379e%26itok%3DiwV36Rt8&w=828&q=75/_next/image?url=http%3A%2F%2Fdvg-b... https://haarlemmermeergemeente.nl/_next/image?url=http%3A%2F%2Fdvg-backend-httpd%2Fsites%2Fhaarlemmermeer%2Ffiles%2Fstyles%2Fopen_online_16_9%2Fpublic%2F2022-11%2F1-home_79A2745_bewerkt-min%20(1).jpg%3Fh%3D98c5379e%26itok%3DiwV36Rt8&w=828&q=75 — 200 — 52.3 KiB — 93 ms — h2https://haarlemmermeergemeente.nl/_next/static/css/3a0523ecd1a05ffd.css/_next/static/css/3a0523ecd1a05ffd.... https://haarlemmermeergemeente.nl/_next/static/css/3a0523ecd1a05ffd.css — 200 — 615 B — 73 ms — h2https://haarlemmermeergemeente.nl/_next/image?url=http%3A%2F%2Fdvg-backend-httpd%2Fsites%2Fhaarlemmermeer%2Ffiles%2Fstyles%2Fopen_online_3_2%2Fpublic%2F2026-11%2FSHARE%20award%20foto_Jur%20Engelchor.jpg%3Fh%3De91768a3%26itok%3DTjwvtRyy&w=828&q=75/_next/image?url=http%3A%2F%2Fdvg-b... https://haarlemmermeergemeente.nl/_next/image?url=http%3A%2F%2Fdvg-backend-httpd%2Fsites%2Fhaarlemmermeer%2Ffiles%2Fstyles%2Fopen_online_3_2%2Fpublic%2F2026-11%2FSHARE%20award%20foto_Jur%20Engelchor.jpg%3Fh%3De91768a3%26itok%3DTjwvtRyy&w=828&q=75 — 200 — 45.3 KiB — 132 ms — h2https://haarlemmermeergemeente.nl/_next/image?url=http%3A%2F%2Fdvg-backend-httpd%2Fsites%2Fhaarlemmermeer%2Ffiles%2Fstyles%2Fopen_online_3_2%2Fpublic%2F2026-11%2F20261110_145836671_iOS.jpg%3Fh%3D71976bb4%26itok%3Dc-65r1BN&w=828&q=75/_next/image?url=http%3A%2F%2Fdvg-b... https://haarlemmermeergemeente.nl/_next/image?url=http%3A%2F%2Fdvg-backend-httpd%2Fsites%2Fhaarlemmermeer%2Ffiles%2Fstyles%2Fopen_online_3_2%2Fpublic%2F2026-11%2F20261110_145836671_iOS.jpg%3Fh%3D71976bb4%26itok%3Dc-65r1BN&w=828&q=75 — 200 — 116.7 KiB — 139 ms — h2https://haarlemmermeergemeente.nl/_next/static/chunks/76910.a6dc1d901667cc0d.js/_next/static/chunks/76910.a6dc1d90... https://haarlemmermeergemeente.nl/_next/static/chunks/76910.a6dc1d901667cc0d.js — 200 — 1.1 KiB — 84 ms — h2https://haarlemmermeergemeente.nl/_next/static/chunks/61364.8f7652bcd680e658.js/_next/static/chunks/61364.8f7652bc... https://haarlemmermeergemeente.nl/_next/static/chunks/61364.8f7652bcd680e658.js — 200 — 1.2 KiB — 91 ms — h2https://haarlemmermeergemeente.nl/_next/static/chunks/webpack-ffb387e711e5bb7b.js/_next/static/chunks/webpack-ffb387... https://haarlemmermeergemeente.nl/_next/static/chunks/webpack-ffb387e711e5bb7b.js — 200 — 19.0 KiB — 124 ms — h2https://haarlemmermeergemeente.nl/_next/static/chunks/framework-cfa9730c0b361aa8.js/_next/static/chunks/framework-cfa9... https://haarlemmermeergemeente.nl/_next/static/chunks/framework-cfa9730c0b361aa8.js — 200 — 44.5 KiB — 139 ms — h2https://haarlemmermeergemeente.nl/_next/static/chunks/main-4fbe98809c211867.js/_next/static/chunks/main-4fbe98809... https://haarlemmermeergemeente.nl/_next/static/chunks/main-4fbe98809c211867.js — 200 — 43.6 KiB — 137 ms — h2https://haarlemmermeergemeente.nl/_next/static/chunks/pages/_app-147da3600acbd0f8.js/_next/static/chunks/pages/_app-147... https://haarlemmermeergemeente.nl/_next/static/chunks/pages/_app-147da3600acbd0f8.js — 200 — 450.1 KiB — 159 ms — h2https://haarlemmermeergemeente.nl/_next/static/chunks/86513-cc0889b9865a192f.js/_next/static/chunks/86513-cc0889b9... https://haarlemmermeergemeente.nl/_next/static/chunks/86513-cc0889b9865a192f.js — 200 — 5.2 KiB — 93 ms — h2https://haarlemmermeergemeente.nl/_next/static/chunks/pages/index-090c47fe6f1f6390.js/_next/static/chunks/pages/index-09... https://haarlemmermeergemeente.nl/_next/static/chunks/pages/index-090c47fe6f1f6390.js — 200 — 2.4 KiB — 102 ms — h2https://haarlemmermeergemeente.nl/_next/static/2eb89e06/_buildManifest.js/_next/static/2eb89e06/_buildManife... https://haarlemmermeergemeente.nl/_next/static/2eb89e06/_buildManifest.js — 200 — 1.1 KiB — 112 ms — h2https://haarlemmermeergemeente.nl/_next/static/2eb89e06/_ssgManifest.js/_next/static/2eb89e06/_ssgManifest... https://haarlemmermeergemeente.nl/_next/static/2eb89e06/_ssgManifest.js — 200 — 605 B — 112 ms — h2https://siteimproveanalytics.com/js/siteanalyze_6006057.jssiteimproveanalytics.com/js/siteana... https://siteimproveanalytics.com/js/siteanalyze_6006057.js — 200 — 111.9 KiB — 74 ms — h3https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js — 200 — 30.9 KiB — 99 ms — h2https://static.mailplus.nl/jq/jquery.validate.1.19.3.min.jsstatic.mailplus.nl/jq/jquery.valida... https://static.mailplus.nl/jq/jquery.validate.1.19.3.min.js — 200 — 24.4 KiB — 114 ms — http/1.1https://m19.mailplus.nl/genericservice/code/servlet/React?command=getFormJs&uid=112418&feid=TmGaJcFFYRMdPgpMhJ9U&p=https&om=t&of=h&c=1&jq=3m19.mailplus.nl/genericservice/code... 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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)

1176 ms

95% good

INP (p75)

93 ms

95% good

CLS (p75)

0.000

97% good

FCP (p75)

901 ms

TTFB (p75)

313 ms

This origin passes Core Web Vitals assessment
Image Optimization
5 images, 345 KB total, 237 KB wasted
INFO

Image Optimization Audit

Total Images

5

Total Size

345 KB

Oversized

2

Wasted

237 KB

4 missing dimensions 3 missing lazy loading
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