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Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
5
REVIEW
6
PASS
13
INFO
3

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

Mobile Desktop
40
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.

2.88 s

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

6.68 s

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

2.53 s

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

0.008

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

5.06 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.

14.15 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
27
13 PASS 6 REVIEW 5 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 Execution Cost
Action
6346ms total JS execution
FIX
6346ms total JS execution
Warning::
https://consent.cookiebot.com/uc.js?cbid=f4263641-...: 1058ms CPU time
Warning::
Unattributable: 804ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-36Q8...: 761ms CPU time
Warning::
https://mijndomein.zendesk.com/hc/nl/articles/4001...: 708ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DW93...: 599ms CPU time
Warning::
Third-party scripts: 5541ms (87% of total)

Main Thread Breakdown

Script Evaluation 60% Script Parsing & Compilation 12% Other 11% Style & Layout 9% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://consent.cookiebot.com/uc.js?cbid=f4263641-16c8-4c0e-8745-3021fcb494ae&implementation=gtm&consentmode-dataredaction=dynamic1058ms543ms37ms3rd
Unattributable804ms172ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-36Q87G45W2&cx=c&gtm=4e6aj1761ms601ms156ms3rd
https://mijndomein.zendesk.com/hc/nl/articles/40010485409170-Beveiligingsupdate-MijnAccount-Mijndomein-Webhosting-Webmail-PHP-kwetsbaarheden-CVE-2026-109618-CVE-2026-109619708ms19ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DW93MWN5JN&cx=c&gtm=4e6aj1599ms492ms104ms3rd
https://static.zdassets.com/hc/assets/hc_enduser-43bd7d52b00e5335ac966bab857ea142.js565ms425ms114ms3rd
https://static.zdassets.com/web_widget/messenger/latest/web-widget-main-7ae1b4a.js477ms374ms96ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T3P74VX415ms354ms49ms3rd
https://scripts.clarity.ms/0.8.72/clarity.js329ms262ms11ms3rd
https://static.zdassets.com/web_widget/messenger/latest/web-widget-5433-7ae1b4a.js199ms117ms81ms3rd

Showing top 10 of 15 scripts

F
JS Bundles
Action
20 scripts, 619 KB unused
FIX
20 scripts, 619 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 (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DW93...: 68 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 619 KB
619 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.js206 KB115 KB (56%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-36Q87G45W2&cx=c&gtm=4e6aj1193 KB76 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DW93MWN5JN&cx=c&gtm=4e6aj1167 KB68 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=dynamic37 KB24 KB (64%)✓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
45 resources · 2.0 MB · 619 KB savings available
FIX
45 resources · 2.0 MB · 619 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::
~619 KB of savings available
Warning::
44 third-party resources (100% of weight)
Info::
2 resources over 200KB
45 resources · 2.0 MiB · 44 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% · 7.0 KiB

~619.5 KiB of savings available

Remove unused JavaScript: 619.5 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, 45 requests
REVIEW
2.0 MB transferred, 45 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::
45 HTTP requests
Info::
Estimated 0.42 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
45 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 4.5 KiB 0%
Other 1.8 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

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+
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::
Total JS execution time is 6.3 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
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
45 requests over 3136ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 2.9 s LCP 6.7 shttps://biermetstijl.com// https://biermetstijl.com/ — 302 — 201 B — 692 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 — 268 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 — 25 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 — 52 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 — 30 ms — h2https://mijndomein.zendesk.com/hc/theming_assets/01M4G56ZQXBR6HC228KWCG2940mijndomein.zendesk.com/hc/theming_a... https://mijndomein.zendesk.com/hc/theming_assets/01M4G56ZQXBR6HC228KWCG2940 — 200 — 6.5 KiB — 24 ms — h2https://mijndomein.zendesk.com/hc/theming_assets/01M4G597KKJ2TDPWDSGGKPEY4Qmijndomein.zendesk.com/hc/theming_a... https://mijndomein.zendesk.com/hc/theming_assets/01M4G597KKJ2TDPWDSGGKPEY4Q — 200 — 694.5 KiB — 65 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 — 36 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 — 205.6 KiB — 61 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 — 29 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 — 90 ms — h2blob:https://mijndomein.zendesk.com/45cd6af2-1498-4112-913d-07c1b4ffb2edmijndomein.zendesk.com/45cd6af2-149... blob:https://mijndomein.zendesk.com/45cd6af2-1498-4112-913d-07c1b4ffb2ed — 200 — -1 B — 67 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 — 4.7 KiB — 24 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 — 9.2 KiB — 46 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 — 2.7 KiB — 49 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 — 53 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 — 44 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 — 598 B — 246 ms — h2https://mijndomein.zendesk.com/hc/activitymijndomein.zendesk.com/hc/activity https://mijndomein.zendesk.com/hc/activity — 200 — 484 B — 606 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 — 62 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 — 37.1 KiB — 93 ms — h2https://www.clarity.ms/tag/xm8cf2d33awww.clarity.ms/tag/xm8cf2d33a https://www.clarity.ms/tag/xm8cf2d33a — 200 — 1.1 KiB — 224 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 — 35 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 — 191.8 KiB — 73 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200 — 2.4 KiB — 20 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 — 4 ms — h2https://s.clarity.ms/collects.clarity.ms/collect https://s.clarity.ms/collect — 204 — 286 B — 237 ms — http/1.1https://c.bing.com/c.gif?ctsa=mr&CtsSyncId=44B4AE4FA61449658A8449D061FE92D1&RedC=c.clarity.ms&MXFR=1DA78D7C3529602F25089A8531296EECc.bing.com/c.gif?ctsa=mr&CtsSyncId=... https://c.bing.com/c.gif?ctsa=mr&CtsSyncId=44B4AE4FA61449658A8449D061FE92D1&RedC=c.clarity.ms&MXFR=1DA78D7C3529602F25089A8531296EEC — 302 — 766 B — 55 ms — h2https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=44B4AE4FA61449658A8449D061FE92D1&MUID=39CB86E343B96EAF0BD4911A42FD6F82c.clarity.ms/c.gif?ctsa=mr&CtsSyncI... https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=44B4AE4FA61449658A8449D061FE92D1&MUID=39CB86E343B96EAF0BD4911A42FD6F82 — 200 — 466 B — 32 ms — h2https://s.clarity.ms/collects.clarity.ms/collect https://s.clarity.ms/collect — 204 — 286 B — 138 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
87% of JavaScript execution is third-party
First-party Third-party 5541ms · 1276KB · €60/mo
consent.cookiebot.com
Other
Costly
Execution 1058ms
Transfer 37 KB
Unused 64%
Monthly Cost €11/mo
Google Tag Manager
Tag Manager
Costly
Execution 761ms
Transfer 193 KB
Unused 40%
Monthly Cost €8/mo
mijndomein.zendesk.com
Other
Costly
Execution 708ms
Transfer 13 KB
Monthly Cost €8/mo
Google Tag Manager
Tag Manager
Costly
Execution 599ms
Transfer 167 KB
Unused 41%
Monthly Cost €7/mo
Zendesk Widget
Customer Support
Costly
Execution 565ms
Transfer 206 KB
Unused 56%
Monthly Cost €6/mo
Zendesk Widget
Customer Support
Costly
Execution 477ms
Transfer 192 KB
Unused 63%
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 415ms
Transfer 127 KB
Unused 49%
Monthly Cost €5/mo
Microsoft Clarity
Session Replay
Costly
Execution 329ms
Transfer 25 KB
Monthly Cost €4/mo
Zendesk Widget
Customer Support
Optional
Execution 199ms
Transfer 139 KB
Unused 91%
Monthly Cost €2/mo
Zendesk Widget
Customer Support
Optional
Execution 138ms
Transfer 6 KB
Monthly Cost €2/mo
Zendesk Widget
Customer Support
Optional
Execution 94ms
Transfer 5 KB
Monthly Cost €1/mo
Zendesk Widget
Customer Support
Optional
Execution 75ms
Transfer 39 KB
Monthly Cost €1/mo
consent.cookiebot.com
Other
Optional
Execution 63ms
Transfer 124 KB
Unused 22%
Monthly Cost €1/mo
Zendesk Widget
Customer Support
Optional
Execution 60ms
Transfer 4 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • consent.cookiebot.com adds 1058ms and costs ~€11/month
  • Google Tag Manager adds 761ms and costs ~€8/month
  • mijndomein.zendesk.com adds 708ms and costs ~€8/month
  • Google Tag Manager adds 599ms and costs ~€7/month
  • Zendesk Widget adds 565ms and costs ~€6/month
  • Zendesk Widget adds 477ms and costs ~€5/month
  • Google Tag Manager adds 415ms and costs ~€5/month
  • Microsoft Clarity adds 329ms and costs ~€4/month

87% 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

consent.cookiebot.com takes 1058ms 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

64% of consent.cookiebot.com'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

Google Tag Manager takes 761ms 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

mijndomein.zendesk.com takes 708ms 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

Google Tag Manager takes 599ms 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

Zendesk Widget takes 565ms 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

Zendesk Widget takes 477ms 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 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

Google Tag Manager takes 415ms 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

Microsoft Clarity takes 329ms 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

91% 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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