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https://vrt.be

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

67
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.
77
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.

999 ms

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

3.80 s

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

225 ms

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

0.057

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

1.72 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.

3.92 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
15
6 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 111 requests
FIX
4.7 MB transferred, 111 requests
Critical::
Page weighs 7.0 MB (4.7 MB transferred)
Warning::
Images are 3.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.6 MB
Warning::
JavaScript is 715 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 715 KB
Warning::
111 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.98 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
111 requests
0.98 g CO2 per page load
Images 3.6 MiB 78%
JavaScript 714.9 KiB 15%
Fonts 129.1 KiB 3%
HTML 76.5 KiB 2%
Other 51.3 KiB 1%
CSS 41.3 KiB 1%
Other 16.3 KiB 0%
Other 4.3 KiB 0%
Other 455 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (4.7 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
111 resources · 4.7 MB · 210 KB savings available
FIX
111 resources · 4.7 MB · 210 KB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~210 KB of savings available
Warning::
110 third-party resources (100% of weight)
Info::
2 resources over 200KB
111 resources · 4.7 MiB · 110 third-party 3.7 MiB over 1MB target
Image 79% · 3.7 MiB
JavaScript 15% · 715.8 KiB
Font 3% · 129.1 KiB
Document 2% · 86.8 KiB
CSS 1% · 41.3 KiB
Other 0% · 11.8 KiB

~209.6 KiB of savings available

Remove unused JavaScript: 209.6 KiB
B
Image Optimization
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Info::
All images are well-optimized
33 images 3.6 MB
0 oversized -0 KB
14 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1700ms total JS execution
REVIEW
1700ms total JS execution
Warning::
https://www.vrt.be/nl/_next/static/chunks/788-2886...: 472ms CPU time
Warning::
https://www.vrt.be/nl: 400ms CPU time
Warning::
Unattributable: 326ms CPU time
Info::
https://assets.adobedtm.com/launch-EN7e1ba6190f454...: 237ms CPU time
Info::
https://www.vrt.be/nl/_next/static/chunks/webpack-...: 156ms CPU time
Warning::
Third-party scripts: 1700ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 23% Style & Layout 16% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.vrt.be/nl/_next/static/chunks/788-2886a49e9b3c002a.js472ms326ms19ms3rd
https://www.vrt.be/nl400ms18ms14ms3rd
Unattributable326ms13ms0ms3rd
https://assets.adobedtm.com/launch-EN7e1ba6190f45421f81025c684b630cc1.min.js237ms193ms28ms3rd
https://www.vrt.be/nl/_next/static/chunks/webpack-kFIv2lOFM5wBTJk0jqFxM.js156ms144ms11ms3rd
https://cmp-sp.vrt.be/unified/wrapperMessagingWithoutDetection.js109ms100ms4ms3rd
C
JS Bundles
Action
41 scripts, 210 KB unused
REVIEW
41 scripts, 210 KB unused
Warning::
https://www.vrt.be/nl/_next/static/chunks/7236-c9a...: 92 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.vrt.be/nl/_next/static/chunks/788-2886...: 41 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.vrt.be/nl/_next/static/chunks/2441-611...: 29 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/launch-EN7e1ba6190f454...: 27 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.vrt.be/nl/_next/static/chunks/8318-e57...: 21 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 210 KB
210 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.vrt.be/nl/_next/static/chunks/7236-c9a0814d0fa8c7de.js106 KB92 KB (88%)3rd
https://www.vrt.be/nl/_next/static/chunks/788-2886a49e9b3c002a.js108 KB41 KB (38%)3rd
https://www.vrt.be/nl/_next/static/chunks/2441-611017b1de707d48.js36 KB29 KB (84%)3rd
https://assets.adobedtm.com/launch-EN7e1ba6190f45421f81025c684b630cc1.min.js111 KB27 KB (34%)3rd
https://www.vrt.be/nl/_next/static/chunks/8318-e576da1540faeb60.js30 KB21 KB (71%)3rd
https://www.vrt.be/nl/_next/static/chunks/6748-519fd04ae01b0e61.js4 KB3rd
https://assets.adobedtm.com/extensions/EP171e731c9ba34f1c950c36d26e3efd61/AppMeasurement.min.js12 KB3rd
https://www.vrt.be/nl/_next/static/chunks/main-app-502768519311bd92.js2 KB3rd
https://www.vrt.be/nl/_next/static/chunks/app/global-error-725c14999bb62379.js4 KB3rd
https://www.vrt.be/nl/_next/static/chunks/9894-e336c31053099c28.js10 KB3rd

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

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
5 fonts (129 KB)
PASS
5 fonts (129 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

129 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 999 ms LCP 3.8 shttps://www.vrt.be/nl/fonts/roobert/RoobertVRT-SemiBold.woff2RoobertVRT-SemiBold.woff2 https://www.vrt.be/nl/fonts/roobert/RoobertVRT-SemiBold.woff2 — 32.4 KiB — 91 ms — font-display: swaphttps://www.vrt.be/nl/fonts/roobert/RoobertVRT-Regular.woff2RoobertVRT-Regular.woff2 https://www.vrt.be/nl/fonts/roobert/RoobertVRT-Regular.woff2 — 31.7 KiB — 70 ms — font-display: swaphttps://www.vrt.be/nl/fonts/roobert/RoobertVRT-Bold.woff2RoobertVRT-Bold.woff2 https://www.vrt.be/nl/fonts/roobert/RoobertVRT-Bold.woff2 — 32.7 KiB — 71 ms — font-display: swaphttps://www.vrt.be/nl/fonts/roobert/RoobertVRT-Medium.woff2RoobertVRT-Medium.woff2 https://www.vrt.be/nl/fonts/roobert/RoobertVRT-Medium.woff2 — 32.3 KiB — 18 ms — font-display: swaphttps://cookie.vrt.be/fonts/Roobert-Regular.woffRoobert-Regular.woff https://cookie.vrt.be/fonts/Roobert-Regular.woff — 0 B — 51 ms — font-display: swap
RoobertVRT-SemiBold.woff2 woff2 swap
Size 32 KB
Load time 91 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
RoobertVRT-Regular.woff2 woff2 swap
Size 32 KB
Load time 70 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
RoobertVRT-Bold.woff2 woff2 swap
Size 33 KB
Load time 71 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
RoobertVRT-Medium.woff2 woff2 swap
Size 32 KB
Load time 18 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
Roobert-Regular.woff woff swap
Size 0 KB
Load time 51 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)
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
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: public, max-age=300
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=300

DirectiveValueMeaning
publicAny cache may store this response
max-age300Cache for 5 minutes
Effective TTL: 300 seconds
Network Waterfall
111 requests over 5178ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 999 ms LCP 3.8 shttps://vrt.be// https://vrt.be/ — 301 — 234 B — 556 ms — h2https://www.vrt.be/www.vrt.be/ https://www.vrt.be/ — 301 — 421 B — 170 ms — h2https://www.vrt.be/nl/www.vrt.be/nl/ https://www.vrt.be/nl/ — 308 — 376 B — 8 ms — h2https://www.vrt.be/nlwww.vrt.be/nl https://www.vrt.be/nl — 200 — 72.3 KiB — 730 ms — h2https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-01.svgwww.vrt.be/nl/assets/images/2024-10... https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-01.svg — 200 — 1.6 KiB — 36 ms — h2https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-02.svgwww.vrt.be/nl/assets/images/2024-10... https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-02.svg — 200 — 1.7 KiB — 37 ms — h2https://www.vrt.be/nl/_next/image?url=https%3A%2F%2Fwww.vrt.be%2Fnl%2Fassets%2Fstyles%2Flandscape_ratio_3_2%2Fpublic%2Fimages%2F2026-04%2FSjabloon-HERO-vrt-be_checkweken.png%3Fitok%3DiaCqY2Gf&w=1920&q=90www.vrt.be/nl/_next/image?url=https... https://www.vrt.be/nl/_next/image?url=https%3A%2F%2Fwww.vrt.be%2Fnl%2Fassets%2Fstyles%2Flandscape_ratio_3_2%2Fpublic%2Fimages%2F2026-04%2FSjabloon-HERO-vrt-be_checkweken.png%3Fitok%3DiaCqY2Gf&w=1920&q=90 — 200 — 154.7 KiB — 44 ms — h2https://www.vrt.be/nl/_next/static/css/b17f1cc25bd7df00.csswww.vrt.be/nl/_next/static/css/b17f... https://www.vrt.be/nl/_next/static/css/b17f1cc25bd7df00.css — 200 — 35.7 KiB — 32 ms — h2https://www.vrt.be/nl/_next/static/css/414c7efc01838865.csswww.vrt.be/nl/_next/static/css/414c... https://www.vrt.be/nl/_next/static/css/414c7efc01838865.css — 200 — 2.3 KiB — 40 ms — h2https://t.vrt.be/latest/vrtebahelper.min.jst.vrt.be/latest/vrtebahelper.min.js https://t.vrt.be/latest/vrtebahelper.min.js — 200 — 5.7 KiB — 182 ms — h2https://t.vrt.be/latest/vrteba.min.jst.vrt.be/latest/vrteba.min.js https://t.vrt.be/latest/vrteba.min.js — 200 — 24.4 KiB — 184 ms — h2https://assets.adobedtm.com/launch-EN7e1ba6190f45421f81025c684b630cc1.min.jsassets.adobedtm.com/launch-EN7e1ba6... https://assets.adobedtm.com/launch-EN7e1ba6190f45421f81025c684b630cc1.min.js — 200 — 111.5 KiB — 51 ms — h2https://sso.vrt.be/optinWidget.min.jssso.vrt.be/optinWidget.min.js https://sso.vrt.be/optinWidget.min.js — 200 — 2.3 KiB — 203 ms — h2https://www.vrt.be/nl/assets/images/2024-10/sporza_wit2.svgwww.vrt.be/nl/assets/images/2024-10... https://www.vrt.be/nl/assets/images/2024-10/sporza_wit2.svg — 200 — 1.3 KiB — 36 ms — h2https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-03.svgwww.vrt.be/nl/assets/images/2024-10... https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-03.svg — 200 — 1.3 KiB — 37 ms — h2https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-04.svgwww.vrt.be/nl/assets/images/2024-10... https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-04.svg — 200 — 2.1 KiB — 50 ms — h2https://www.vrt.be/nl/assets/images/2024-10/logoketnet_vrtbe_blauw.svgwww.vrt.be/nl/assets/images/2024-10... https://www.vrt.be/nl/assets/images/2024-10/logoketnet_vrtbe_blauw.svg — 200 — 1.3 KiB — 54 ms — h2https://www.vrt.be/nl/assets/images/2025-06/radio1.svgwww.vrt.be/nl/assets/images/2025-06... https://www.vrt.be/nl/assets/images/2025-06/radio1.svg — 200 — 1.7 KiB — 30 ms — h2https://www.vrt.be/nl/assets/images/2025-06/color.svgwww.vrt.be/nl/assets/images/2025-06... https://www.vrt.be/nl/assets/images/2025-06/color.svg — 200 — 1.9 KiB — 28 ms — h2https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-05.svgwww.vrt.be/nl/assets/images/2024-10... https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-05.svg — 200 — 1.8 KiB — 55 ms — h2https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-06.svgwww.vrt.be/nl/assets/images/2024-10... https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-06.svg — 200 — 3.8 KiB — 31 ms — h2https://www.vrt.be/nl/_next/static/chunks/webpack-kFIv2lOFM5wBTJk0jqFxM.jswww.vrt.be/nl/_next/static/chunks/w... https://www.vrt.be/nl/_next/static/chunks/webpack-kFIv2lOFM5wBTJk0jqFxM.js — 200 — 3.8 KiB — 106 ms — h2https://www.vrt.be/nl/_next/static/chunks/fd9d1056-c316fd9cc4f516ff.jswww.vrt.be/nl/_next/static/chunks/f... https://www.vrt.be/nl/_next/static/chunks/fd9d1056-c316fd9cc4f516ff.js — 200 — 53.8 KiB — 83 ms — h2https://www.vrt.be/nl/_next/static/chunks/788-2886a49e9b3c002a.jswww.vrt.be/nl/_next/static/chunks/7... https://www.vrt.be/nl/_next/static/chunks/788-2886a49e9b3c002a.js — 200 — 107.8 KiB — 83 ms — h2https://www.vrt.be/nl/_next/static/chunks/main-app-502768519311bd92.jswww.vrt.be/nl/_next/static/chunks/m... https://www.vrt.be/nl/_next/static/chunks/main-app-502768519311bd92.js — 200 — 1.9 KiB — 41 ms — h2https://www.vrt.be/nl/_next/static/chunks/app/global-error-725c14999bb62379.jswww.vrt.be/nl/_next/static/chunks/a... https://www.vrt.be/nl/_next/static/chunks/app/global-error-725c14999bb62379.js — 200 — 3.8 KiB — 43 ms — h2https://www.vrt.be/nl/_next/static/chunks/9894-e336c31053099c28.jswww.vrt.be/nl/_next/static/chunks/9... https://www.vrt.be/nl/_next/static/chunks/9894-e336c31053099c28.js — 200 — 9.8 KiB — 105 ms — h2https://www.vrt.be/nl/_next/static/chunks/7451-4f24716cf26f8442.jswww.vrt.be/nl/_next/static/chunks/7... https://www.vrt.be/nl/_next/static/chunks/7451-4f24716cf26f8442.js — 200 — 7.2 KiB — 59 ms — h2https://www.vrt.be/nl/_next/static/chunks/2371-348b6a431188101e.jswww.vrt.be/nl/_next/static/chunks/2... https://www.vrt.be/nl/_next/static/chunks/2371-348b6a431188101e.js — 200 — 17.4 KiB — 48 ms — h2https://www.vrt.be/nl/_next/static/chunks/2441-611017b1de707d48.jswww.vrt.be/nl/_next/static/chunks/2... https://www.vrt.be/nl/_next/static/chunks/2441-611017b1de707d48.js — 200 — 35.8 KiB — 95 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 999 ms LCP 3.8 shttps://vrt.be// https://vrt.be/ — 301 — 234 B — 556 ms — h2https://www.vrt.be/www.vrt.be/ https://www.vrt.be/ — 301 — 421 B — 170 ms — h2https://www.vrt.be/nl/www.vrt.be/nl/ https://www.vrt.be/nl/ — 308 — 376 B — 8 ms — h2https://www.vrt.be/nlwww.vrt.be/nl https://www.vrt.be/nl — 200 — 72.3 KiB — 730 ms — h2https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-01.svgwww.vrt.be/nl/assets/images/2024-10... https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-01.svg — 200 — 1.6 KiB — 36 ms — h2https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-02.svgwww.vrt.be/nl/assets/images/2024-10... https://www.vrt.be/nl/assets/images/2024-10/vrtweb-logos-02.svg — 200 — 1.7 KiB — 37 ms — h2https://www.vrt.be/nl/_next/image?url=https%3A%2F%2Fwww.vrt.be%2Fnl%2Fassets%2Fstyles%2Flandscape_ratio_3_2%2Fpublic%2Fimages%2F2026-04%2FSjabloon-HERO-vrt-be_checkweken.png%3Fitok%3DiaCqY2Gf&w=1920&q=90www.vrt.be/nl/_next/image?url=https... 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h2https://gabe.hit.gemius.pl/__/_1776900963560/rexdot.js?l=100&sendf=24&id=.RCVVir7bQn.P.7HJrzsmXa4TBkBtcS0ujAy79zfGkD.r7&et=view&hsrc=1&initsonar=1&extra=lan%3DNL&eventid=0&tz=0&fv=-&href=https%3A%2F%2Fwww.vrt.be%2Fnl&mtp=0&screen=800x600r1000&col=24&window=1350x940&cmpf=1&vis=1&lsdata=VFN7umpno5cf6PVZCkQSU6xs3PD1KL2VZLvfd9_adFX.J7sUjRC9y9cOennOcdYDRbtqt1q.JZGPoanTyoIf5mN7jyOq/bT6_kIB0.lcbG/&fpdata=T516prUol6sEbC.sIQYOpIQYxUPky33.fgIqiGQzfe3._7%7C1776900963%7C2%7C%7C%7C8%3A2%3A32&ltime=599&fr=1&ref=&inner=_ver%3D403%7C_min%3D1%7C_cmp_id%3D6%7C_cmp_ver%3D1%7C_fpsrc%3Dload%7C_ch_arch%3Dx86%7C_ch_pm%3DmacOS%7C_ch_pver%3D10.15.7%7C_ch_bits%3D64%7C_ch_mobile%3D0%7C_ch_wow64%3D0%7C_ch_brands%3D%7B%22Not-A.Brand%22%2C%2224.0.0.0%22%7D%2C%7B%22Chromium%22%2C%22146.0.7680.164%22%7D&exid=69e95b62391bc25e&brts=1776900963&fpcap=gabe.hit.gemius.pl/__/_177690096356... https://gabe.hit.gemius.pl/__/_1776900963560/rexdot.js?l=100&sendf=24&id=.RCVVir7bQn.P.7HJrzsmXa4TBkBtcS0ujAy79zfGkD.r7&et=view&hsrc=1&initsonar=1&extra=lan%3DNL&eventid=0&tz=0&fv=-&href=https%3A%2F%2Fwww.vrt.be%2Fnl&mtp=0&screen=800x600r1000&col=24&window=1350x940&cmpf=1&vis=1&lsdata=VFN7umpno5cf6PVZCkQSU6xs3PD1KL2VZLvfd9_adFX.J7sUjRC9y9cOennOcdYDRbtqt1q.JZGPoanTyoIf5mN7jyOq/bT6_kIB0.lcbG/&fpdata=T516prUol6sEbC.sIQYOpIQYxUPky33.fgIqiGQzfe3._7%7C1776900963%7C2%7C%7C%7C8%3A2%3A32&ltime=599&fr=1&ref=&inner=_ver%3D403%7C_min%3D1%7C_cmp_id%3D6%7C_cmp_ver%3D1%7C_fpsrc%3Dload%7C_ch_arch%3Dx86%7C_ch_pm%3DmacOS%7C_ch_pver%3D10.15.7%7C_ch_bits%3D64%7C_ch_mobile%3D0%7C_ch_wow64%3D0%7C_ch_brands%3D%7B%22Not-A.Brand%22%2C%2224.0.0.0%22%7D%2C%7B%22Chromium%22%2C%22146.0.7680.164%22%7D&exid=69e95b62391bc25e&brts=1776900963&fpcap= — 200 — 551 B — 390 ms — h2https://o1278829.ingest.us.sentry.io/api/4510663701430272/envelope/?sentry_version=7&sentry_key=8feeaf7cd890cf4dfb0ba24224fc9c5a&sentry_client=sentry.javascript.nextjs%2F10.32.1o1278829.ingest.us.sentry.io/api/45... https://o1278829.ingest.us.sentry.io/api/4510663701430272/envelope/?sentry_version=7&sentry_key=8feeaf7cd890cf4dfb0ba24224fc9c5a&sentry_client=sentry.javascript.nextjs%2F10.32.1 — 429 — 174 B — 68 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1700ms · 336KB · €18/mo
www.vrt.be
Other
Costly
Execution 472ms
Transfer 108 KB
Unused 38%
Monthly Cost €5/mo
www.vrt.be
Other
Costly
Execution 400ms
Transfer 72 KB
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 326ms
Transfer 0 KB
Monthly Cost €4/mo
assets.adobedtm.com
Other
Costly
Execution 237ms
Transfer 111 KB
Unused 34%
Monthly Cost €3/mo
www.vrt.be
Other
Optional
Execution 156ms
Transfer 4 KB
Monthly Cost €2/mo
cmp-sp.vrt.be
Other
Optional
Execution 109ms
Transfer 40 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.vrt.be adds 472ms and costs ~€5/month
  • www.vrt.be adds 400ms and costs ~€4/month
  • Unattributable adds 326ms and costs ~€4/month
  • assets.adobedtm.com adds 237ms and costs ~€3/month

100% 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

www.vrt.be takes 472ms 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

www.vrt.be takes 400ms 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

Unattributable takes 326ms 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

assets.adobedtm.com takes 237ms 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

How third-party costs are calculated

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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