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https://www.middelburg.nl

Performance

· 24 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
2
REVIEW
8
PASS
10
INFO
4

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

Mobile Desktop
75
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

1.11 s

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

1.80 s

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

16 ms

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

0.289

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

1.11 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.

1.90 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
10 PASS 8 REVIEW 2 FIX
D
Third-Party Impact
Action
86% third-party, 0 ms blocking
FIX
86% third-party, 0 ms blocking
Warning::
Third-party code accounts for 86% of page weight (1.7 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
86%
First-party Third-party
D
Page Weight Inventory
Action
98 resources · 2.0 MB · 161 KB savings available
FIX
98 resources · 2.0 MB · 161 KB savings available
Warning::
Page weight 2.0 MB exceeds 1 MB target by 1.0 MB
Got: 2.0 MB Expected: ≤ 1 MB
Info::
~161 KB of savings available
Warning::
87 third-party resources (86% of weight)
Info::
1 resources over 200KB
98 resources · 2.0 MiB · 87 third-party 1.0 MiB over 1MB target
JavaScript 34% · 691.8 KiB
Image 29% · 599.3 KiB
Font 17% · 352.0 KiB
Other 12% · 249.6 KiB
CSS 6% · 131.3 KiB
Document 2% · 40.1 KiB

~161.4 KiB of savings available

Remove unused JavaScript: 161.4 KiB
C
Page Weight Budget
Action
2.0 MB transferred, 98 requests
REVIEW
2.0 MB transferred, 98 requests
Info::
Page weighs 6.2 MB (2.0 MB transferred)
Warning::
JavaScript is 691 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 691 KB
Info::
Fonts are 352 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 352 KB
Info::
98 HTTP requests
Info::
Estimated 0.42 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
98 requests
0.42 g CO2 per page load
JavaScript 690.7 KiB 33%
Images 597.1 KiB 29%
Fonts 352.0 KiB 17%
Other 248.1 KiB 12%
CSS 131.3 KiB 6%
HTML 39.9 KiB 2%
Other 3.3 KiB 0%
Other 1.5 KiB 0%
Other 230 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

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

B
Image Optimization
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Info::
All images are well-optimized
6 images 597 KB
0 oversized -0 KB
6 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
41 scripts, 161 KB unused
REVIEW
41 scripts, 161 KB unused
Warning::
https://middelburg.logging.simanalytics.nl/piwik.j...: 59 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/stat...: 50 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/stat...: 29 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/stat...: 23 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 161 KB
161 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://middelburg.logging.simanalytics.nl/piwik.js134 KB59 KB (44%)✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/3t-fp4k4vnpbe.js57 KB50 KB (88%)✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/453vyw5pupwi9.js68 KB29 KB (43%)✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/21-1lnek6vezq.js67 KB23 KB (35%)✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/34kog4seun0vk.js2 KB—✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/1eqhzl0-k473i.js8 KB—✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/3l648yjn6i3g2.js3 KB—✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/2pp0lcrkgfaxj.js12 KB—✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/18n-aizvfnrqo.js9 KB—✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/1vggu62g791zq.js9 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

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
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.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document response uses gzip; brotli would be ~20% smaller
Info::
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.
C
Asset Compression
Action
1 of 3 asset hosts serve text uncompressed
REVIEW
1 of 3 asset hosts serve text uncompressed
Info::
cuatro.sim-cdn.nl serves assets with brotli (assets: 66)
Got: cuatro.sim-cdn.nl (text/css)
Info::
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)
Warning::
middelburg.logging.simanalytics.nl serves text assets uncompressed (assets: 3)
The sampled response carries a text content type but no Content-Encoding, so the bytes go over the wire raw. Text compression typically removes 70-80% of a JS or CSS payload -- this is the single cheapest transfer win available on this host.
Got: middelburg.logging.simanalytics.nl (application/javascript)
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+
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+
JS Execution Cost
415ms total JS execution
PASS
415ms total JS execution
Info::
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/stat...: 148ms CPU time
Info::
https://www.middelburg.nl/: 117ms CPU time
Info::
Unattributable: 95ms CPU time
Info::
https://middelburg.logging.simanalytics.nl/piwik.j...: 54ms CPU time
Info::
Third-party scripts: 203ms (49% of total)

Main Thread Breakdown

Script Evaluation 51% Other 21% Style & Layout 16% Script Parsing & Compilation 7% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/21-1lnek6vezq.js148ms134ms4ms3rd
https://www.middelburg.nl/117ms2ms0ms1st
Unattributable95ms5ms0ms1st
https://middelburg.logging.simanalytics.nl/piwik.js54ms35ms3ms3rd
A+
Font Loading
6 fonts (352 KB)
PASS
6 fonts (352 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

352 KB total

Render-blocking

0

of 6

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 FCP 1.1 s LCP 1.8 shttps://fonts.bunny.net/roboto/files/roboto-latin-400-normal.woff2roboto-latin-400-normal... https://fonts.bunny.net/roboto/files/roboto-latin-400-normal.woff2 — 22.1 KiB — 7 ms — font-display: swaphttps://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/fontawesome6/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/fontawesome6/webfonts/fa-solid-900.woff2 — 155.1 KiB — 23 ms — font-display: swaphttps://fonts.bunny.net/roboto/files/roboto-latin-300-normal.woff2roboto-latin-300-normal... https://fonts.bunny.net/roboto/files/roboto-latin-300-normal.woff2 — 22.3 KiB — 19 ms — font-display: swaphttps://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/opengemeenten/fonts/OpenGemeenten.woff2OpenGemeenten.woff2 https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/opengemeenten/fonts/OpenGemeenten.woff2 — 25.7 KiB — 17 ms — font-display: swaphttps://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/toptaken/fonts/toptaken01.woff2toptaken01.woff2 https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/toptaken/fonts/toptaken01.woff2 — 10.5 KiB — 14 ms — font-display: swaphttps://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/fontawesome6/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/fontawesome6/webfonts/fa-brands-400.woff2 — 116.5 KiB — 24 ms — font-display: swap
roboto-latin-400-normal... woff2 swap
Size 22 KB
Load time 7 ms
Start 375 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 23 ms
Start 375 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
roboto-latin-300-normal... woff2 swap
Size 22 KB
Load time 19 ms
Start 375 ms
Risk FOUT — text flashes from fallback to web font
OpenGemeenten.woff2 woff2 swap
Size 26 KB
Load time 17 ms
Start 375 ms
Risk FOUT — text flashes from fallback to web font
toptaken01.woff2 woff2 swap
Size 10 KB
Load time 14 ms
Start 376 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 24 ms
Start 376 ms
Risk FOUT — text flashes from fallback to web font
  • 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 ~136 KB and ~272 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 max-age=30 (≤ 5min) is appropriate
PASS
Main HTML max-age=30 (≤ 5min) is appropriate
Info::
Main HTML max-age=30 (≤ 5min) is appropriate
Got: public, s-maxage=60, max-age=30, stale-while-revalidate=59
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`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).
Info::
`ETag` present -- conditional GET supported
A+
HTTP Caching
max-age=30 (30 seconds)
PASS
max-age=30 (30 seconds)
Info::
Cache-Control header is set
Got: public, s-maxage=60, max-age=30, stale-while-revalidate=59
Info::
Effective TTL: 30 seconds (max-age=30)
Info::
CDN TTL: 1 minute (s-maxage=60)
Info::
ETag present — enables conditional (304) responses
Cache-Control

public, s-maxage=60, max-age=30, stale-while-revalidate=59

DirectiveValueMeaning
public—Any cache may store this response
s-maxage60CDN caches for 1 minute
max-age30Cache for 30 seconds
stale-while-revalidate59Serve stale for 59 seconds while fetching fresh
Effective TTL: 30 seconds
Network Waterfall
98 requests over 1232ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.8 shttps://www.middelburg.nl// https://www.middelburg.nl/ — 200 — 39.9 KiB — 261 ms — h2https://middelburg.logging.simanalytics.nl/piwik.jsmiddelburg.logging.simanalytics.nl/... https://middelburg.logging.simanalytics.nl/piwik.js — 200 — 134.4 KiB — 104 ms — h2https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/30ijih9_e22f8.csscuatro.sim-cdn.nl/assets/2.14.0/_ne... https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/30ijih9_e22f8.css — 200 — 15.0 KiB — 31 ms — h2https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/10arvv-jh8nzv.csscuatro.sim-cdn.nl/assets/2.14.0/_ne... https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/10arvv-jh8nzv.css — 200 — 7.8 KiB — 31 ms — h2https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/33z5n6-lnpck7.csscuatro.sim-cdn.nl/assets/2.14.0/_ne... https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/33z5n6-lnpck7.css — 200 — 16.2 KiB — 33 ms — h2https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/0bx-ct0qicbz6.csscuatro.sim-cdn.nl/assets/2.14.0/_ne... https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/0bx-ct0qicbz6.css — 200 — 1.3 KiB — 31 ms — h2https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/0wc7p9zha7cgu.csscuatro.sim-cdn.nl/assets/2.14.0/_ne... https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/0wc7p9zha7cgu.css — 200 — 15.8 KiB — 33 ms — h2https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/opengemeenten/css/opengemeenten.csscuatro.sim-cdn.nl/assets/2.14.0/ico... https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/opengemeenten/css/opengemeenten.css — 200 — 2.0 KiB — 27 ms — h2https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/toptaken/css/toptaken.csscuatro.sim-cdn.nl/assets/2.14.0/ico... https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/toptaken/css/toptaken.css — 200 — 1.4 KiB — 26 ms — h2https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/fontawesome6/css/fontawesome.6.7.2.csscuatro.sim-cdn.nl/assets/2.14.0/ico... https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/fontawesome6/css/fontawesome.6.7.2.css — 200 — 21.0 KiB — 29 ms — h2https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/fontawesome6/css/v5-font-face.csscuatro.sim-cdn.nl/assets/2.14.0/ico... https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/fontawesome6/css/v5-font-face.css — 200 — 1.2 KiB — 22 ms — h2https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/fontawesome6/css/v4-shims.csscuatro.sim-cdn.nl/assets/2.14.0/ico... https://cuatro.sim-cdn.nl/assets/2.14.0/iconFonts/fontawesome6/css/v4-shims.css — 200 — 4.3 KiB — 23 ms — h2https://cuatro.sim-cdn.nl/assets/2.14.0/fonts/openDyslexic/css/open-dyslexic.csscuatro.sim-cdn.nl/assets/2.14.0/fon... https://cuatro.sim-cdn.nl/assets/2.14.0/fonts/openDyslexic/css/open-dyslexic.css — 200 — 488 B — 22 ms — h2https://fonts.bunny.net/css?family=fira-sans%3A100%2C200%2C300%2C400%2C500%2C600%2C700%7Clato%3A100%2C300%2C400%2C700%2C900%7Copen-sans%3A300%2C300i%2C400%2C400i%2C500%2C500i%2C600%2C600i%2C700%2C700i%2C800%2C800i%7Croboto%3A100%2C300%2C400%2C500%2C700&display=swapfonts.bunny.net/css?family=fira-san... https://fonts.bunny.net/css?family=fira-sans%3A100%2C200%2C300%2C400%2C500%2C600%2C700%7Clato%3A100%2C300%2C400%2C700%2C900%7Copen-sans%3A300%2C300i%2C400%2C400i%2C500%2C500i%2C600%2C600i%2C700%2C700i%2C800%2C800i%7Croboto%3A100%2C300%2C400%2C500%2C700&display=swap — 200 — 4.1 KiB — 47 ms — h2https://cuatro.sim-cdn.nl/middelburg/uploads/2020-12/mb-01_oranje.svg?cb=UG-cQN4xcuatro.sim-cdn.nl/middelburg/upload... https://cuatro.sim-cdn.nl/middelburg/uploads/2020-12/mb-01_oranje.svg?cb=UG-cQN4x — 200 — 3.7 KiB — 7 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
49% of JavaScript execution is third-party
First-party Third-party 203ms · 201KB · €2/mo
cuatro.sim-cdn.nl
Other
Optional
Execution 148ms
Transfer 67 KB
Unused 35%
Monthly Cost €2/mo
middelburg.logging.simanalytics.nl
Other
Optional
Execution 54ms
Transfer 134 KB
Unused 44%
Monthly Cost €1/mo

49% 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)

1158 ms

95% good

INP (p75)

154 ms

90% good

CLS (p75)

0.110

62% good

FCP (p75)

1024 ms

TTFB (p75)

438 ms

Image Optimization
6 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

6

Total Size

0 KB

Oversized

1

2 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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