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Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
7
PASS
9
INFO
3

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

Mobile Desktop
81
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.
100
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.

1.11 s

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

1.86 s

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

218 ms

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

0.007

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

1.59 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.

3.23 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 7 REVIEW 4 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.0 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
20 scripts, 596 KB unused
FIX
20 scripts, 596 KB unused
Warning::
https://static.zdassets.com/web_widget/messenger/l...: 127 KB unused (91%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.zdassets.com/web_widget/messenger/l...: 120 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.zdassets.com/hc/assets/hc_enduser-4...: 115 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-36Q8...: 76 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DW93...: 69 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 596 KB
596 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.zdassets.com/web_widget/messenger/latest/web-widget-5433-7ae1b4a.js139 KB127 KB (91%)✓3rd
https://static.zdassets.com/web_widget/messenger/latest/web-widget-main-7ae1b4a.js192 KB120 KB (63%)✓3rd
https://static.zdassets.com/hc/assets/hc_enduser-43bd7d52b00e5335ac966bab857ea142.js205 KB115 KB (56%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-36Q87G45W2&cx=c&gtm=4e6aj1193 KB76 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DW93MWN5JN&cx=c&gtm=4e6aj1167 KB69 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T3P74VX127 KB62 KB (49%)✓3rd
https://consent.cookiebot.com/f4263641-16c8-4c0e-8745-3021fcb494ae/cc.js?renew=false&referer=mijndomein.zendesk.com&dnt=false&init=false124 KB28 KB (22%)✓3rd
https://consent.cookiebot.com/uc.js?cbid=f4263641-16c8-4c0e-8745-3021fcb494ae&implementation=gtm&consentmode-dataredaction=dynamic28 KB—✓3rd
https://static.zdassets.com/hc/assets/94328-f1cdfc8439f3de4a6c4029e31ec2c810.js4 KB—✓3rd
https://static.zdassets.com/hc/assets/subscribe-2cb18de122726ca352ec318d92032c29.js4 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

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
46 resources · 2.0 MB · 596 KB savings available
FIX
46 resources · 2.0 MB · 596 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::
~596 KB of savings available
Warning::
45 third-party resources (100% of weight)
Info::
2 resources over 200KB
46 resources · 2.0 MiB · 45 third-party 1.0 MiB over 1MB target
JavaScript 63% · 1.3 MiB
Image 34% · 703.9 KiB
CSS 1% · 30.6 KiB
Document 1% · 15.4 KiB
Other 0% · 7.3 KiB

~595.6 KiB of savings available

Remove unused JavaScript: 595.6 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Page Weight Budget
Action
2.0 MB transferred, 46 requests
REVIEW
2.0 MB transferred, 46 requests
Info::
Page weighs 5.0 MB (2.0 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
46 HTTP requests
Info::
Estimated 0.42 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
46 requests
0.42 g CO2 per page load
JavaScript 1.3 MiB 63%
Images 701.5 KiB 34%
CSS 30.6 KiB 1%
HTML 13.3 KiB 1%
Other 5.3 KiB 0%
Other 4.4 KiB 0%
Other 2.1 KiB 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

B
Image Optimization
5 images, 0 KB saveable
REVIEW
5 images, 0 KB saveable
Warning::
https://mijndomein.zendesk.com/hc/theming_assets/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mijndomein.zendesk.com/hc/theming_assets/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
5 images 701 KB
0 oversized -0 KB
3 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

C
JS Execution Cost
Action
1425ms total JS execution
REVIEW
1425ms total JS execution
Info::
Unattributable: 232ms CPU time
Info::
https://mijndomein.zendesk.com/hc/nl/articles/4001...: 214ms CPU time
Info::
https://consent.cookiebot.com/f4263641-16c8-4c0e-8...: 192ms CPU time
Info::
https://static.zdassets.com/hc/assets/hc_enduser-4...: 135ms CPU time
Info::
https://scripts.clarity.ms/0.8.72/clarity.js: 133ms CPU time
Warning::
Third-party scripts: 1194ms (84% of total)

Main Thread Breakdown

Script Evaluation 55% Other 13% Style & Layout 11% Script Parsing & Compilation 11% Parse HTML & CSS 6% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
Unattributable232ms28ms0ms1st
https://mijndomein.zendesk.com/hc/nl/articles/40010485409170-Beveiligingsupdate-MijnAccount-Mijndomein-Webhosting-Webmail-PHP-kwetsbaarheden-CVE-2026-109618-CVE-2026-109619214ms3ms7ms3rd
https://consent.cookiebot.com/f4263641-16c8-4c0e-8745-3021fcb494ae/cc.js?renew=false&referer=mijndomein.zendesk.com&dnt=false&init=false192ms81ms13ms3rd
https://static.zdassets.com/hc/assets/hc_enduser-43bd7d52b00e5335ac966bab857ea142.js135ms109ms20ms3rd
https://scripts.clarity.ms/0.8.72/clarity.js133ms118ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DW93MWN5JN&cx=c&gtm=4e6aj1119ms97ms21ms3rd
https://www.googletagmanager.com/gtag/js?id=G-36Q87G45W2&cx=c&gtm=4e6aj1115ms93ms21ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T3P74VX85ms69ms14ms3rd
https://static.zdassets.com/web_widget/messenger/latest/web-widget-main-7ae1b4a.js81ms64ms17ms3rd
https://static.zdassets.com/ekr/snippet.js?key=web_widget/mijndomein.zendesk.com60ms58ms0ms3rd

Showing top 10 of 11 scripts

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
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
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.
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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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+
Asset Compression
All 2 asset hosts use brotli
PASS
All 2 asset hosts use brotli
Info::
static.zdassets.com serves assets with brotli (assets: 5)
Got: static.zdassets.com (text/css)
Info::
www.googletagmanager.com serves assets with brotli (assets: 3)
Got: www.googletagmanager.com (application/javascript)
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+
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.
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Metaregistrar BV

Network Waterfall
46 requests over 4815ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.1 s LCP 1.9 shttps://biermetstijl.com// https://biermetstijl.com/ — 302 — 201 B — 433 ms — h2https://mijndomein.zendesk.com/hc/nl/articles/40010485409170-Beveiligingsupdate-webhosting-PHP-kwetsbaarheden-CVE-2026-109618-CVE-2026-109619mijndomein.zendesk.com/hc/nl/articl... https://mijndomein.zendesk.com/hc/nl/articles/40010485409170-Beveiligingsupdate-webhosting-PHP-kwetsbaarheden-CVE-2026-109618-CVE-2026-109619 — 301 — 1.4 KiB — 340 ms — h2https://mijndomein.zendesk.com/hc/nl/articles/40010485409170-Beveiligingsupdate-MijnAccount-Mijndomein-Webhosting-Webmail-PHP-kwetsbaarheden-CVE-2026-109618-CVE-2026-109619mijndomein.zendesk.com/hc/nl/articl... https://mijndomein.zendesk.com/hc/nl/articles/40010485409170-Beveiligingsupdate-MijnAccount-Mijndomein-Webhosting-Webmail-PHP-kwetsbaarheden-CVE-2026-109618-CVE-2026-109619 — 200 — 12.5 KiB — 22 ms — h2https://static.zdassets.com/hc/assets/application-b925b7498ff4356827db8a6064e91e2b.cssstatic.zdassets.com/hc/assets/appli... https://static.zdassets.com/hc/assets/application-b925b7498ff4356827db8a6064e91e2b.css — 200 — 13.4 KiB — 46 ms — h2https://mijndomein.zendesk.com/hc/theming_assets/301156/29521/style.css?digest=40011676757010mijndomein.zendesk.com/hc/theming_a... https://mijndomein.zendesk.com/hc/theming_assets/301156/29521/style.css?digest=40011676757010 — 200 — 17.2 KiB — 39 ms — h2https://mijndomein.zendesk.com/hc/theming_assets/01M4G56ZQXBR6HC228KWCG2940mijndomein.zendesk.com/hc/theming_a... https://mijndomein.zendesk.com/hc/theming_assets/01M4G56ZQXBR6HC228KWCG2940 — 200 — 6.4 KiB — 38 ms — h2https://mijndomein.zendesk.com/hc/theming_assets/01M4G597KKJ2TDPWDSGGKPEY4Qmijndomein.zendesk.com/hc/theming_a... https://mijndomein.zendesk.com/hc/theming_assets/01M4G597KKJ2TDPWDSGGKPEY4Q — 200 — 694.6 KiB — 58 ms — h2https://static.zdassets.com/hc/assets/nl.4af2c57e5c2393762772.jsstatic.zdassets.com/hc/assets/nl.4a... https://static.zdassets.com/hc/assets/nl.4af2c57e5c2393762772.js — 200 — 39.2 KiB — 26 ms — h2https://static.zdassets.com/hc/assets/hc_enduser-43bd7d52b00e5335ac966bab857ea142.jsstatic.zdassets.com/hc/assets/hc_en... https://static.zdassets.com/hc/assets/hc_enduser-43bd7d52b00e5335ac966bab857ea142.js — 200 — 205.5 KiB — 45 ms — h2https://mijndomein.zendesk.com/hc/theming_assets/301156/29521/script.js?digest=40011676757010mijndomein.zendesk.com/hc/theming_a... https://mijndomein.zendesk.com/hc/theming_assets/301156/29521/script.js?digest=40011676757010 — 200 — 15.0 KiB — 31 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-T3P74VXwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-T3P74VX — 200 — 127.4 KiB — 96 ms — h2blob:https://mijndomein.zendesk.com/c5d1d994-5337-4ec4-9d0b-a21eaa4fce8bmijndomein.zendesk.com/c5d1d994-533... blob:https://mijndomein.zendesk.com/c5d1d994-5337-4ec4-9d0b-a21eaa4fce8b — 200 — -1 B — 82 ms — blobhttps://static.zdassets.com/ekr/snippet.js?key=web_widget/mijndomein.zendesk.comstatic.zdassets.com/ekr/snippet.js?... https://static.zdassets.com/ekr/snippet.js?key=web_widget/mijndomein.zendesk.com — 200 — 4.6 KiB — 21 ms — h2https://static.zdassets.com/hc/assets/99806-38c72ed549b5f07fbc0d14e09b374433.jsstatic.zdassets.com/hc/assets/99806... https://static.zdassets.com/hc/assets/99806-38c72ed549b5f07fbc0d14e09b374433.js — 200 — 9.3 KiB — 19 ms — h2https://static.zdassets.com/hc/assets/22661-40d533a00ac67aac6caa5e44a836ad77.jsstatic.zdassets.com/hc/assets/22661... https://static.zdassets.com/hc/assets/22661-40d533a00ac67aac6caa5e44a836ad77.js — 200 — 2.8 KiB — 62 ms — h2https://static.zdassets.com/hc/assets/94328-f1cdfc8439f3de4a6c4029e31ec2c810.jsstatic.zdassets.com/hc/assets/94328... https://static.zdassets.com/hc/assets/94328-f1cdfc8439f3de4a6c4029e31ec2c810.js — 200 — 3.7 KiB — 22 ms — h2https://static.zdassets.com/hc/assets/subscribe-2cb18de122726ca352ec318d92032c29.jsstatic.zdassets.com/hc/assets/subsc... https://static.zdassets.com/hc/assets/subscribe-2cb18de122726ca352ec318d92032c29.js — 200 — 4.2 KiB — 35 ms — h2https://mijndomein.zendesk.com/api/v2/help_center/nl/articles/40010485409170/stats/view.jsonmijndomein.zendesk.com/api/v2/help_... https://mijndomein.zendesk.com/api/v2/help_center/nl/articles/40010485409170/stats/view.json — 200 — 683 B — 519 ms — h2https://mijndomein.zendesk.com/hc/activitymijndomein.zendesk.com/hc/activity https://mijndomein.zendesk.com/hc/activity — 200 — 420 B — 175 ms — h2https://www.googletagmanager.com/gtag/js?id=G-36Q87G45W2&cx=c&gtm=4e6aj1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-36Q87G45W2&cx=c&gtm=4e6aj1 — 200 — 192.6 KiB — 99 ms — h2https://www.googletagmanager.com/gtag/js?id=G-DW93MWN5JN&cx=c&gtm=4e6aj1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-DW93MWN5JN&cx=c&gtm=4e6aj1 — 200 — 166.7 KiB — 61 ms — h2https://consent.cookiebot.com/uc.js?cbid=f4263641-16c8-4c0e-8745-3021fcb494ae&implementation=gtm&consentmode-dataredaction=dynamicconsent.cookiebot.com/uc.js?cbid=f4... https://consent.cookiebot.com/uc.js?cbid=f4263641-16c8-4c0e-8745-3021fcb494ae&implementation=gtm&consentmode-dataredaction=dynamic — 200 — 28.1 KiB — 103 ms — h2https://www.clarity.ms/tag/xm8cf2d33awww.clarity.ms/tag/xm8cf2d33a https://www.clarity.ms/tag/xm8cf2d33a — 200 — 1.2 KiB — 240 ms — http/1.1https://ekr.zdassets.com/compose/web_widget/mijndomein.zendesk.comekr.zdassets.com/compose/web_widget... https://ekr.zdassets.com/compose/web_widget/mijndomein.zendesk.com — 200 — 1.8 KiB — 67 ms — h2https://static.zdassets.com/web_widget/messenger/latest/web-widget-main-7ae1b4a.jsstatic.zdassets.com/web_widget/mess... https://static.zdassets.com/web_widget/messenger/latest/web-widget-main-7ae1b4a.js — 200 — 191.9 KiB — 60 ms — 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http/1.1https://mijndomein.zendesk.com/hc/theming_assets/01M4G5702WGEH6EGEKMNBV114Amijndomein.zendesk.com/hc/theming_a... https://mijndomein.zendesk.com/hc/theming_assets/01M4G5702WGEH6EGEKMNBV114A — 200 — 2.4 KiB — 19 ms — h2https://c.bing.com/c.gif?ctsa=mr&CtsSyncId=9EEC2D4680CF4132BB1BEEED4C66A54C&RedC=c.clarity.ms&MXFR=19D00141F4AC6D89399E16B8F0AC63D8c.bing.com/c.gif?ctsa=mr&CtsSyncId=... https://c.bing.com/c.gif?ctsa=mr&CtsSyncId=9EEC2D4680CF4132BB1BEEED4C66A54C&RedC=c.clarity.ms&MXFR=19D00141F4AC6D89399E16B8F0AC63D8 — 302 — 766 B — 81 ms — h2https://mijndomein.zendesk.com/hc/theming_assets/01M4G5702WGEH6EGEKMNBV114Amijndomein.zendesk.com/hc/theming_a... https://mijndomein.zendesk.com/hc/theming_assets/01M4G5702WGEH6EGEKMNBV114A — 200 — 0 B — 6 ms — h2https://k.clarity.ms/collectk.clarity.ms/collect https://k.clarity.ms/collect — 204 — 286 B — 236 ms — http/1.1https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=9EEC2D4680CF4132BB1BEEED4C66A54C&MUID=11AA823EA5FF6859194F95C7A47C693Bc.clarity.ms/c.gif?ctsa=mr&CtsSyncI... https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=9EEC2D4680CF4132BB1BEEED4C66A54C&MUID=11AA823EA5FF6859194F95C7A47C693B — 200 — 466 B — 36 ms — h2https://k.clarity.ms/collectk.clarity.ms/collect https://k.clarity.ms/collect — 204 — 286 B — 130 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
84% of JavaScript execution is third-party
First-party Third-party 1194ms · 1078KB · €13/mo
mijndomein.zendesk.com
Other
Costly
Execution 214ms
Transfer 13 KB
Monthly Cost €2/mo
consent.cookiebot.com
Other
Optional
Execution 192ms
Transfer 124 KB
Unused 22%
Monthly Cost €2/mo
Zendesk Widget
Customer Support
Optional
Execution 135ms
Transfer 205 KB
Unused 56%
Monthly Cost €1/mo
Microsoft Clarity
Session Replay
Optional
Execution 133ms
Transfer 25 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 119ms
Transfer 167 KB
Unused 41%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 115ms
Transfer 193 KB
Unused 39%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 85ms
Transfer 127 KB
Unused 49%
Monthly Cost €1/mo
Zendesk Widget
Customer Support
Optional
Execution 81ms
Transfer 192 KB
Unused 63%
Monthly Cost €1/mo
Zendesk Widget
Customer Support
Optional
Execution 60ms
Transfer 5 KB
Monthly Cost €1/mo
consent.cookiebot.com
Other
Optional
Execution 60ms
Transfer 28 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • mijndomein.zendesk.com adds 214ms and costs ~€2/month

84% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

mijndomein.zendesk.com takes 214ms 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

56% of Zendesk Widget'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

63% of Zendesk Widget'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

Image Optimization
29 images, 705 KB total, 5 KB wasted
INFO

Image Optimization Audit

Total Images

29

Total Size

705 KB

Oversized

1

Wasted

5 KB

28 missing dimensions 27 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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