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Performance

· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
4
REVIEW
7
PASS
13
INFO
4

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

Mobile Desktop
51
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

8.03 s

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

13.39 s

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

291 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.

8.03 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.

13.48 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
28
13 PASS 7 REVIEW 4 FIX
D
Page Weight Budget
Action
2.1 MB transferred, 150 requests
FIX
2.1 MB transferred, 150 requests
Info::
Page weighs 7.3 MB (2.1 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 327 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 327 KB
Warning::
150 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.44 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
150 requests
0.44 g CO2 per page load
JavaScript 1.1 MiB 52%
Fonts 327.0 KiB 15%
Images 284.2 KiB 13%
Other 234.0 KiB 11%
CSS 105.1 KiB 5%
Other 52.5 KiB 2%
HTML 29.9 KiB 1%
Other 1.6 KiB 0%
Other 228 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
94% third-party, 0 ms blocking
FIX
94% third-party, 0 ms blocking
Warning::
Third-party code accounts for 94% of page weight (2.0 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
94%
First-party Third-party
D
JS Execution Cost
Action
2831ms total JS execution
FIX
2831ms total JS execution
Warning::
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/stat...: 762ms CPU time
Warning::
Unattributable: 746ms CPU time
Warning::
https://www.harlingen.nl/: 495ms CPU time
Warning::
https://app.tolkie.nl/: 259ms CPU time
Info::
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/stat...: 223ms CPU time
Warning::
Third-party scripts: 1590ms (56% of total)

Main Thread Breakdown

Script Evaluation 46% Other 23% Style & Layout 16% Script Parsing & Compilation 6% Parse HTML & CSS 4% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/21-1lnek6vezq.js762ms667ms18ms3rd
Unattributable746ms14ms0ms1st
https://www.harlingen.nl/495ms6ms2ms1st
https://app.tolkie.nl/259ms180ms2ms3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/453vyw5pupwi9.js223ms208ms15ms3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/turbopack-2ro3tmdn33ah0.js218ms216ms1ms3rd
https://harlingen.logging.simanalytics.nl/piwik.js127ms60ms14ms3rd
D
Page Weight Inventory
Action
150 resources · 2.1 MB · 186 KB savings available
FIX
150 resources · 2.1 MB · 186 KB savings available
Warning::
Page weight 2.1 MB exceeds 1 MB target by 1.1 MB
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~186 KB of savings available
Warning::
85 third-party resources (94% of weight)
Info::
2 resources over 200KB
150 resources · 2.1 MiB · 85 third-party 1.1 MiB over 1MB target
JavaScript 52% · 1.1 MiB
Image 22% · 473.3 KiB
Font 15% · 327.0 KiB
CSS 5% · 105.1 KiB
Other 4% · 85.7 KiB
Document 2% · 42.3 KiB

~186.0 KiB of savings available

Remove unused JavaScript: 186.0 KiB
B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 284 KB
0 oversized -0 KB
6 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
45 scripts, 186 KB unused
REVIEW
45 scripts, 186 KB unused
Warning::
https://harlingen.logging.simanalytics.nl/piwik.js: 84 KB unused (63%)
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: 186 KB
186 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://harlingen.logging.simanalytics.nl/piwik.js134 KB84 KB (63%)✓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/turbopack-2ro3tmdn33ah0.js5 KB—✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/0mx3bdnbdzb79.js7 KB—✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/42r6x75fsxu0l.js2 KB—✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/2iari5gxw_yxr.js1 KB—✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/2ssstg295gr2u.js1 KB—✓3rd
https://cuatro.sim-cdn.nl/assets/2.14.0/_next/static/chunks/3l648yjn6i3g2.js3 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.
B
Asset Compression
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::
app.tolkie.nl serves assets with brotli (assets: 3)
Got: app.tolkie.nl (text/css)
Warning::
harlingen.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: harlingen.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+
Font Loading
6 fonts (327 KB)
PASS
6 fonts (327 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

327 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 8.0 s LCP 13.4 shttps://cdn.jsdelivr.net/fontsource/fonts/nunito-sans@5.3.0/latin-400-normal.woff2latin-400-normal.woff2 https://cdn.jsdelivr.net/fontsource/fonts/nunito-sans@5.3.0/latin-400-normal.woff2 — 14.3 KiB — 108 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 — 105 ms — font-display: swaphttps://cdn.jsdelivr.net/fontsource/fonts/nunito-sans@5.3.0/latin-700-normal.woff2latin-700-normal.woff2 https://cdn.jsdelivr.net/fontsource/fonts/nunito-sans@5.3.0/latin-700-normal.woff2 — 13.9 KiB — 108 ms — font-display: swaphttps://cdn.jsdelivr.net/fontsource/fonts/nunito-sans@5.3.0/latin-300-normal.woff2latin-300-normal.woff2 https://cdn.jsdelivr.net/fontsource/fonts/nunito-sans@5.3.0/latin-300-normal.woff2 — 13.8 KiB — 114 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 — 117 ms — font-display: swaphttps://app.tolkie.nl/fonts/atkinson-hyperlegible-next-latin-700-normal.woff2atkinson-hyperlegible-n... https://app.tolkie.nl/fonts/atkinson-hyperlegible-next-latin-700-normal.woff2 — 13.4 KiB — 88 ms — font-display: swap
latin-400-normal.woff2 woff2 swap
Size 14 KB
Load time 108 ms
Start 637 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 105 ms
Start 638 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
latin-700-normal.woff2 woff2 swap
Size 14 KB
Load time 108 ms
Start 638 ms
Risk FOUT — text flashes from fallback to web font
latin-300-normal.woff2 woff2 swap
Size 14 KB
Load time 114 ms
Start 638 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 117 ms
Start 638 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
atkinson-hyperlegible-n... woff2 swap
Size 13 KB
Load time 88 ms
Start 2.3 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)

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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
—
prefetch
1

7 resource hints configured

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+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
2 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
A
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
13 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
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
150 requests over 2487ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 8.0 s LCP 13.4 shttps://www.harlingen.nl// https://www.harlingen.nl/ — 200 — 27.8 KiB — 192 ms — h2https://harlingen.logging.simanalytics.nl/piwik.jsharlingen.logging.simanalytics.nl/p... https://harlingen.logging.simanalytics.nl/piwik.js — 200 — 134.4 KiB — 214 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 — 93 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 — 105 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 — 112 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 — 91 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 — 106 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 — 100 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 — 93 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 — 108 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 — 90 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 — 91 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 — 490 B — 103 ms — 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datadata:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2222…data:image/svg+xml;utf8,%3Csvg%20xm... data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2222… — 200 — 0 B — 0 ms — datadata:image/svg+xml;utf8,%3Csvg%20version%3D%221.1%22%20id%3D%22Layer_1%22%20xmlns%3D%22http%3A%2F%2…data:image/svg+xml;utf8,%3Csvg%20ve... data:image/svg+xml;utf8,%3Csvg%20version%3D%221.1%22%20id%3D%22Layer_1%22%20xmlns%3D%22http%3A%2F%2… — 200 — 0 B — 0 ms — datahttps://app.tolkie.nl/fonts/atkinson-hyperlegible-next-latin-700-normal.woff2app.tolkie.nl/fonts/atkinson-hyperl... https://app.tolkie.nl/fonts/atkinson-hyperlegible-next-latin-700-normal.woff2 — 200 — 13.4 KiB — 88 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
56% of JavaScript execution is third-party
First-party Third-party 1590ms · 481KB · €17/mo
cuatro.sim-cdn.nl
Other
Costly
Execution 762ms
Transfer 67 KB
Unused 35%
Monthly Cost €8/mo
app.tolkie.nl
Other
Costly
Execution 259ms
Transfer 207 KB
Monthly Cost €3/mo
cuatro.sim-cdn.nl
Other
Costly
Execution 223ms
Transfer 68 KB
Unused 43%
Monthly Cost €2/mo
cuatro.sim-cdn.nl
Other
Costly
Execution 218ms
Transfer 5 KB
Monthly Cost €2/mo
harlingen.logging.simanalytics.nl
Other
Optional
Execution 127ms
Transfer 134 KB
Unused 63%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • cuatro.sim-cdn.nl adds 762ms and costs ~€8/month
  • app.tolkie.nl adds 259ms and costs ~€3/month
  • cuatro.sim-cdn.nl adds 223ms and costs ~€2/month
  • cuatro.sim-cdn.nl adds 218ms and costs ~€2/month

56% 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

cuatro.sim-cdn.nl takes 762ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

app.tolkie.nl takes 259ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cuatro.sim-cdn.nl takes 223ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cuatro.sim-cdn.nl takes 218ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

63% of harlingen.logging.simanalytics.nl's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

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)

999 ms

96% good

INP (p75)

139 ms

92% good

CLS (p75)

0.150

71% good

FCP (p75)

838 ms

TTFB (p75)

406 ms

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

Image Optimization Audit

Total Images

11

Total Size

0 KB

5 missing dimensions 1 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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