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https://nrc.nl

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
28
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

4.20 s

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

4.83 s

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

2.12 s

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

0.241

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

7.02 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.

20.55 s

Page Load Progression

441 ms
882 ms
1.3 s
1.8 s
2.2 s
2.6 s
3.1 s
3.5 s
Checks
17
8 PASS 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.1 MB transferred, 92 requests
FIX
2.1 MB transferred, 92 requests
Info::
Page weighs 5.8 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 239 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 239 KB
Info::
92 HTTP requests
Info::
Estimated 0.44 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
92 requests
0.44 g CO2 per page load
JavaScript 1.1 MiB 50%
Images 677.7 KiB 31%
Fonts 239.1 KiB 11%
HTML 59.8 KiB 3%
CSS 43.6 KiB 2%
Other 24.6 KiB 1%
Other 23.2 KiB 1%
Other 10.0 KiB 0%
Other 315 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

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 (2.1 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
9079ms total JS execution
FIX
9079ms total JS execution
Warning::
https://www.nrc.nl/: 3846ms CPU time
Warning::
https://load.sst.nrc.nl/kxlupzzx.js?st=KKRPPB: 1517ms CPU time
Warning::
https://assets.nrc.nl/static/front/js/main.db164c9...: 846ms CPU time
Warning::
Unattributable: 725ms CPU time
Warning::
https://load.sst.nrc.nl/gtag/js?id=G-Q3L8E2PF4V&cx...: 518ms CPU time
Warning::
Third-party scripts: 9079ms (100% of total)

Main Thread Breakdown

Script Evaluation 39% Other 28% Style & Layout 17% Rendering 7% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.nrc.nl/3846ms83ms7ms3rd
https://load.sst.nrc.nl/kxlupzzx.js?st=KKRPPB1517ms1353ms98ms3rd
https://assets.nrc.nl/static/front/js/main.db164c9ed.js846ms484ms86ms3rd
Unattributable725ms23ms0ms3rd
https://load.sst.nrc.nl/gtag/js?id=G-Q3L8E2PF4V&cx=c&gtm=4e64k0518ms406ms69ms3rd
https://prod-nrcm.mhtr.be/public/tr/tracker.min.js311ms180ms96ms3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js255ms200ms54ms3rd
https://cdn.sophi.io/assets/demeter/1/stable/3569875221.js?isConsented=true230ms209ms21ms3rd
https://assets.nrc.nl/static/front/components/js/dmt-icon.2405b9fc1.js198ms125ms53ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js174ms143ms30ms3rd

Showing top 10 of 14 scripts

D
JS Bundles
Action
23 scripts, 483 KB unused
FIX
23 scripts, 483 KB unused
Warning::
https://prod-nrcm.mhtr.be/public/tr/tracker.min.js: 113 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.nrc.nl/static/front/js/main.db164c9...: 76 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sdk.privacy-center.org/sdk/22ecd6bfac93de6...: 63 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.nrc.nl/static/front/components/js/d...: 63 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://load.sst.nrc.nl/gtag/js?id=G-Q3L8E2PF4V&cx...: 61 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 483 KB
483 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://prod-nrcm.mhtr.be/public/tr/tracker.min.js159 KB113 KB (71%)✓3rd
https://assets.nrc.nl/static/front/js/main.db164c9ed.js119 KB76 KB (65%)✓3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js101 KB63 KB (63%)✓3rd
https://assets.nrc.nl/static/front/components/js/dmt-icon.2405b9fc1.js89 KB63 KB (71%)✓3rd
https://load.sst.nrc.nl/gtag/js?id=G-Q3L8E2PF4V&cx=c&gtm=4e64k0162 KB61 KB (38%)✓3rd
https://load.sst.nrc.nl/kxlupzzx.js?st=KKRPPB166 KB45 KB (27%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB36 KB (64%)✓3rd
https://assets.nrc.nl/static/front/js/vendor.0677b1b4d.js49 KB25 KB (50%)✓3rd
https://assets.nrc.nl/static/front/nmt-split-css-manifest.167c5b347.js2 KB—✓3rd
https://assets.nrc.nl/static/front/js/chunks/WebNotifications.cffe1920a.js1 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
92 resources · 2.1 MB · 483 KB savings available
FIX
92 resources · 2.1 MB · 483 KB savings available
Warning::
Page weight 1.1 MB over 1MB target
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~483 KB of savings available
Warning::
91 third-party resources (100% of weight)
92 resources · 2.1 MiB · 91 third-party 1.1 MiB over 1MB target
JavaScript 50% · 1.1 MiB
Image 33% · 701.0 KiB
Font 11% · 239.1 KiB
Document 3% · 63.3 KiB
CSS 2% · 43.6 KiB
Other 1% · 31.4 KiB

~483.0 KiB of savings available

Remove unused JavaScript: 483.0 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.

B
Image Optimization
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Info::
All images are well-optimized
33 images 678 KB
0 oversized -0 KB
10 legacy format
0 missing dimensions CLS risk
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
7 fonts (239 KB)
PASS
7 fonts (239 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

239 KB total

Render-blocking

0

of 7

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 4.0 s 5.0 s FCP 4.2 s LCP 4.8 shttps://assets.nrc.nl/static/front/fonts/GuardianEgyp-Medium-Web.6aed85556.woff2GuardianEgyp-Medium-Web... https://assets.nrc.nl/static/front/fonts/GuardianEgyp-Medium-Web.6aed85556.woff2 — 32.1 KiB — 816 ms — font-display: swaphttps://assets.nrc.nl/static/front/fonts/GuardianEgyp-Regular-Web.a71963a16.woff2GuardianEgyp-Regular-We... https://assets.nrc.nl/static/front/fonts/GuardianEgyp-Regular-Web.a71963a16.woff2 — 30.3 KiB — 821 ms — font-display: swaphttps://assets.nrc.nl/static/front/fonts/LFT_Etica_Reg.4bfcdd546.woff2LFT_Etica_Reg.4bfcdd546... https://assets.nrc.nl/static/front/fonts/LFT_Etica_Reg.4bfcdd546.woff2 — 32.2 KiB — 975 ms — font-display: swaphttps://assets.nrc.nl/static/front/fonts/LFT_Etica_Semibold.1be95c177.woff2LFT_Etica_Semibold.1be9... https://assets.nrc.nl/static/front/fonts/LFT_Etica_Semibold.1be95c177.woff2 — 31.7 KiB — 977 ms — font-display: swaphttps://assets.nrc.nl/static/front/fonts/GuardianTextEgyp-Regular-Web.0561af52a.woff2GuardianTextEgyp-Regula... https://assets.nrc.nl/static/front/fonts/GuardianTextEgyp-Regular-Web.0561af52a.woff2 — 42.9 KiB — 224 ms — font-display: swaphttps://assets.nrc.nl/static/front/fonts/LFT_Etica_Book.8f783e38c.woff2LFT_Etica_Book.8f783e38... https://assets.nrc.nl/static/front/fonts/LFT_Etica_Book.8f783e38c.woff2 — 38.9 KiB — 258 ms — font-display: swaphttps://assets.nrc.nl/static/front/fonts/GuardianEgyp-Light-Web.54c4728dd.woff2GuardianEgyp-Light-Web.... https://assets.nrc.nl/static/front/fonts/GuardianEgyp-Light-Web.54c4728dd.woff2 — 31.0 KiB — 378 ms — font-display: swap
GuardianEgyp-Medium-Web... woff2 swap
Size 32 KB
Load time 816 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
GuardianEgyp-Regular-We... woff2 swap
Size 30 KB
Load time 821 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
LFT_Etica_Reg.4bfcdd546... woff2 swap
Size 32 KB
Load time 975 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
LFT_Etica_Semibold.1be9... woff2 swap
Size 32 KB
Load time 977 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
GuardianTextEgyp-Regula... woff2 swap
Size 43 KB
Load time 224 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
LFT_Etica_Book.8f783e38... woff2 swap
Size 39 KB
Load time 258 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
GuardianEgyp-Light-Web.... woff2 swap
Size 31 KB
Load time 378 ms
Start 1.8 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)
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
1
preload
5
dns-prefetch
1
prefetch
—

7 resource hints configured

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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Intermax

Network Waterfall
92 requests over 7066ms
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 4.2 s LCP 4.8 shttps://nrc.nl// https://nrc.nl/ — 301 — 338 B — 505 ms — http/1.1https://www.nrc.nl/www.nrc.nl/ https://www.nrc.nl/ — 200 — 57.9 KiB — 834 ms — http/1.1https://assets.nrc.nl/static/front/fonts/GuardianEgyp-Medium-Web.6aed85556.woff2assets.nrc.nl/static/front/fonts/Gu... https://assets.nrc.nl/static/front/fonts/GuardianEgyp-Medium-Web.6aed85556.woff2 — 200 — 32.1 KiB — 816 ms — h2https://assets.nrc.nl/static/front/fonts/GuardianEgyp-Regular-Web.a71963a16.woff2assets.nrc.nl/static/front/fonts/Gu... https://assets.nrc.nl/static/front/fonts/GuardianEgyp-Regular-Web.a71963a16.woff2 — 200 — 30.3 KiB — 821 ms — h2https://assets.nrc.nl/static/front/fonts/LFT_Etica_Reg.4bfcdd546.woff2assets.nrc.nl/static/front/fonts/LF... https://assets.nrc.nl/static/front/fonts/LFT_Etica_Reg.4bfcdd546.woff2 — 200 — 32.2 KiB — 975 ms — h2https://assets.nrc.nl/static/front/fonts/LFT_Etica_Semibold.1be95c177.woff2assets.nrc.nl/static/front/fonts/LF... https://assets.nrc.nl/static/front/fonts/LFT_Etica_Semibold.1be95c177.woff2 — 200 — 31.7 KiB — 977 ms — h2https://assets.nrc.nl/static/front/css/main.11aa071ef.cssassets.nrc.nl/static/front/css/main... https://assets.nrc.nl/static/front/css/main.11aa071ef.css — 200 — 13.2 KiB — 663 ms — h2https://assets.nrc.nl/static/front/css/split/header-and-footer.5e49114f3.cssassets.nrc.nl/static/front/css/spli... https://assets.nrc.nl/static/front/css/split/header-and-footer.5e49114f3.css — 200 — 5.4 KiB — 654 ms — h2https://assets.nrc.nl/static/front/css/split/vorm-variables.fa674b062.cssassets.nrc.nl/static/front/css/spli... https://assets.nrc.nl/static/front/css/split/vorm-variables.fa674b062.css — 200 — 1.6 KiB — 655 ms — h2https://assets.nrc.nl/static/front/css/split/index.d7cde8467.cssassets.nrc.nl/static/front/css/spli... https://assets.nrc.nl/static/front/css/split/index.d7cde8467.css — 200 — 8.9 KiB — 661 ms — h2https://assets.nrc.nl/static/front/css/split/layout-home.0f6721656.cssassets.nrc.nl/static/front/css/spli... https://assets.nrc.nl/static/front/css/split/layout-home.0f6721656.css — 200 — 416 B — 658 ms — h2https://assets.nrc.nl/static/front/css/split/timed-articles.140afb3fc.cssassets.nrc.nl/static/front/css/spli... https://assets.nrc.nl/static/front/css/split/timed-articles.140afb3fc.css — 200 — 764 B — 660 ms — h2https://images.nrc.nl/6D86HE0N5nzUDFqR648U0Z6zxpY=/1280x768/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22151837/220426BIN_2033207905_energieprijzen.jpgimages.nrc.nl/6D86HE0N5nzUDFqR648U0... https://images.nrc.nl/6D86HE0N5nzUDFqR648U0Z6zxpY=/1280x768/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22151837/220426BIN_2033207905_energieprijzen.jpg — 200 — 70.0 KiB — 30 ms — h2https://images.nrc.nl/AfS6lyyb8WI6tkDjcBBeqtFjyJg=/1280x768/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22212556/220426VER_2033231439_Loosdrecht.jpgimages.nrc.nl/AfS6lyyb8WI6tkDjcBBeq... https://images.nrc.nl/AfS6lyyb8WI6tkDjcBBeqtFjyJg=/1280x768/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22212556/220426VER_2033231439_Loosdrecht.jpg — 200 — 138.8 KiB — 31 ms — h2https://sdk.privacy-center.org/11ef8ac9-6270-4d5e-8b99-8d6a5bd60059/loader.js?target_type=notice&target=Ft3H289Tsdk.privacy-center.org/11ef8ac9-627... https://sdk.privacy-center.org/11ef8ac9-6270-4d5e-8b99-8d6a5bd60059/loader.js?target_type=notice&target=Ft3H289T — 200 — 30.8 KiB — 517 ms — h2https://assets.nrc.nl/static/front/img/economist-e.3c4590c9c.svgassets.nrc.nl/static/front/img/econ... https://assets.nrc.nl/static/front/img/economist-e.3c4590c9c.svg — 200 — 489 B — 169 ms — h2https://images.nrc.nl/Mn46lNBn7t_b9rp7f9wnr8kzt4g=/0x82:5892x3617/320x192/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22211510/220426VER_2033231236_Trump.jpgimages.nrc.nl/Mn46lNBn7t_b9rp7f9wnr... https://images.nrc.nl/Mn46lNBn7t_b9rp7f9wnr8kzt4g=/0x82:5892x3617/320x192/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22211510/220426VER_2033231236_Trump.jpg — 200 — 10.5 KiB — 180 ms — h2https://images.nrc.nl/l5i-rNuZAXiyl6S61SmNQXGeuZ0=/320x192/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22113040/220426VER_2033209413_.jpgimages.nrc.nl/l5i-rNuZAXiyl6S61SmNQ... https://images.nrc.nl/l5i-rNuZAXiyl6S61SmNQXGeuZ0=/320x192/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22113040/220426VER_2033209413_.jpg — 200 — 19.5 KiB — 28 ms — h2https://images.nrc.nl/2lrjdxXN1TefMYHYnN6zAultqQw=/320x192/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22131111/220426BIN_2033203444_utrecht1.jpgimages.nrc.nl/2lrjdxXN1TefMYHYnN6zA... https://images.nrc.nl/2lrjdxXN1TefMYHYnN6zAultqQw=/320x192/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22131111/220426BIN_2033203444_utrecht1.jpg — 200 — 21.2 KiB — 15 ms — h2https://images.nrc.nl/g6eyBsu8psEQJv6-KhR2e8Jk9wo=/320x192/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/21151246/220426BIN_2033187618_asielwet.jpgimages.nrc.nl/g6eyBsu8psEQJv6-KhR2e... https://images.nrc.nl/g6eyBsu8psEQJv6-KhR2e8Jk9wo=/320x192/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/21151246/220426BIN_2033187618_asielwet.jpg — 200 — 11.7 KiB — 35 ms — 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h2https://sst.nrc.nl/g/collect?v=2&tid=G-Q3L8E2PF4V&gtm=45he64k0v870725205z871576918za20kzb71576918zd71576918&_p=1776892005584&gcs=G101&gcd=13p3t3p3p5l1&npa=1&dma_cps=-&dma=0&tcfd=10000&ecid=1516566485&_eu=AAAAAGA&_fplc=0&are=1&cid=780494617.1776892007&frm=0&pscdl=denied&rcb=15&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&ur=SG&sst.rnd=2079181332.1776892007&sst.etld=google.com.sg&sst.us_privacy=1---&sst.tft=1776892005584&sst.lpc=195554419&sst.navt=n&sst.ude=0&sst.sw_exp=1&gaf=2&_s=1&tag_exp=0~115616986~115938465~115938468~117266400~117512543~117884344&sid=1776892006&sct=1&seg=0&dl=https%3A%2F%2Fwww.nrc.nl%2F&dt=NRC%20-%20Nieuws%2C%20achtergronden%20en%20onderzoeksjournalistiek&_tu=DA&en=page_view&_fv=1&_nsi=1&_ss=2&gap.gtb=1&ep.eventId=1776892404307_177689219768074&epn.client_timestamp=1776892006467&ep.compact_url=https%3A%2F%2Fwww.nrc.nl%2F&ep.previous_compact_url=&ep.application=www&ep.sophi_experiments_code=pw%3Aarticle%3Atest3_ab%3Dvariant&ep.sophi_inputs=HA%3A11%7CHB%3A1%7CFA%3A00%7CDC%3A01%7CDE%3A01%7CEA%3AAndroid%7CEB%3A01%7CEC%3AChrome%7CDD%3A20%7CDB%3AUTC%7CGC%3Adirect&ep.sophi_context=DA00AA00AB00AC00BA00BB00BC00AD00AE00BD00BE00BF00AF00BG00CA00CB00CC00CD00CE00CF00CG00&ep.sophi_trace=t004010v00----d0068xxb0060xx&up.subscription_status=Onbekend&up.login_status=niet%20ingelogd&up.subscription_type=niet_abonnee&tfd=3924&richsstssesst.nrc.nl/g/collect?v=2&tid=G-Q3L8... https://sst.nrc.nl/g/collect?v=2&tid=G-Q3L8E2PF4V&gtm=45he64k0v870725205z871576918za20kzb71576918zd71576918&_p=1776892005584&gcs=G101&gcd=13p3t3p3p5l1&npa=1&dma_cps=-&dma=0&tcfd=10000&ecid=1516566485&_eu=AAAAAGA&_fplc=0&are=1&cid=780494617.1776892007&frm=0&pscdl=denied&rcb=15&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&ur=SG&sst.rnd=2079181332.1776892007&sst.etld=google.com.sg&sst.us_privacy=1---&sst.tft=1776892005584&sst.lpc=195554419&sst.navt=n&sst.ude=0&sst.sw_exp=1&gaf=2&_s=1&tag_exp=0~115616986~115938465~115938468~117266400~117512543~117884344&sid=1776892006&sct=1&seg=0&dl=https%3A%2F%2Fwww.nrc.nl%2F&dt=NRC%20-%20Nieuws%2C%20achtergronden%20en%20onderzoeksjournalistiek&_tu=DA&en=page_view&_fv=1&_nsi=1&_ss=2&gap.gtb=1&ep.eventId=1776892404307_177689219768074&epn.client_timestamp=1776892006467&ep.compact_url=https%3A%2F%2Fwww.nrc.nl%2F&ep.previous_compact_url=&ep.application=www&ep.sophi_experiments_code=pw%3Aarticle%3Atest3_ab%3Dvariant&ep.sophi_inputs=HA%3A11%7CHB%3A1%7CFA%3A00%7CDC%3A01%7CDE%3A01%7CEA%3AAndroid%7CEB%3A01%7CEC%3AChrome%7CDD%3A20%7CDB%3AUTC%7CGC%3Adirect&ep.sophi_context=DA00AA00AB00AC00BA00BB00BC00AD00AE00BD00BE00BF00AF00BG00CA00CB00CC00CD00CE00CF00CG00&ep.sophi_trace=t004010v00----d0068xxb0060xx&up.subscription_status=Onbekend&up.login_status=niet%20ingelogd&up.subscription_type=niet_abonnee&tfd=3924&richsstsse — 200 — 227 B — 530 ms — h2https://sst.nrc.nl/_/service_worker/63b0/sw_iframe.html?origin=https%3A%2F%2Fwww.nrc.nl&1p=1sst.nrc.nl/_/service_worker/63b0/sw... https://sst.nrc.nl/_/service_worker/63b0/sw_iframe.html?origin=https%3A%2F%2Fwww.nrc.nl&1p=1 — 200 — 1.9 KiB — 470 ms — h2https://prod-nrcm.mhtr.be/next/vprod-nrcm.mhtr.be/next/v https://prod-nrcm.mhtr.be/next/v — 200 — 0 B — 183 ms — h2https://prod-nrcm.mhtr.be/next/vprod-nrcm.mhtr.be/next/v https://prod-nrcm.mhtr.be/next/v — 200 — 407 B — 178 ms — h2https://cdn.optoutadvertising.com/script/sf/base.min.jscdn.optoutadvertising.com/script/sf... https://cdn.optoutadvertising.com/script/sf/base.min.js — 200 — 6.0 KiB — 1.0 s — h2https://adserving.optoutadvertising.com/prebid/displayadserving.optoutadvertising.com/pre... https://adserving.optoutadvertising.com/prebid/display — 200 — 16.8 KiB — 674 ms — h2https://cdn.optoutadvertising.com/script/sf/hostOptOut.min.jscdn.optoutadvertising.com/script/sf... https://cdn.optoutadvertising.com/script/sf/hostOptOut.min.js — 200 — 9.6 KiB — 161 ms — h2https://static.hotjar.com/c/hotjar-298877.js?sv=7static.hotjar.com/c/hotjar-298877.j... https://static.hotjar.com/c/hotjar-298877.js?sv=7 — 200 — 9.2 KiB — 17 ms — h2https://bgmin.cdn.billygrace.com/?t=1776902400000&v=0.1.0.1bgmin.cdn.billygrace.com/?t=1776902... https://bgmin.cdn.billygrace.com/?t=1776902400000&v=0.1.0.1 — 200 — 5.7 KiB — 520 ms — h2https://assets.nrc.nl/static/front/icons/favicon.icoassets.nrc.nl/static/front/icons/fa... https://assets.nrc.nl/static/front/icons/favicon.ico — 200 — 2.3 KiB — 165 ms — h2https://script.hotjar.com/modules.6a0f3932cb1341a35c18.jsscript.hotjar.com/modules.6a0f3932c... https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js — 200 — 56.6 KiB — 17 ms — h2https://b.billypx.com/?id=ID-BD-A49C72&uid=v0.4.11-0udpxzmv-moajmh17&session_id=v0.4.11-oexrltc3-moajmh18_1776892009148&ev=pageload&ed=%7B%22pageLoadID%22%3A%22v0.4.11-55772198-1776892009148%22%7D&v=v0.4.11&dl=https%3A%2F%2Fwww.nrc.nl%2F&rl=&ts=1776892008622&de=&sr=&vp=&cd=&dt=NRC%20-%20Nieuws%2C%20achtergronden%20en%20onderzoeksjournalistiek&bn=Chrome%20146&md=true&ua=Mozilla%2F5.0%20(Linux%3B%20Android%2011%3B%20moto%20g%20power%20(2022))%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F146.0.0.0%20Mobile%20Safari%2F537.36&tz=0&tt=web&utm_source=&utm_medium=&utm_term=&utm_content=&utm_campaign=&utm_source_platform=&utm_creative_format=&utm_marketing_tactic=&bg_source=&bg_source_id=&bg_kw=&bg_campaign=&bg_aid_k=&bg_aid_v=&bg_ts=b.billypx.com/?id=ID-BD-A49C72&uid=... https://b.billypx.com/?id=ID-BD-A49C72&uid=v0.4.11-0udpxzmv-moajmh17&session_id=v0.4.11-oexrltc3-moajmh18_1776892009148&ev=pageload&ed=%7B%22pageLoadID%22%3A%22v0.4.11-55772198-1776892009148%22%7D&v=v0.4.11&dl=https%3A%2F%2Fwww.nrc.nl%2F&rl=&ts=1776892008622&de=&sr=&vp=&cd=&dt=NRC%20-%20Nieuws%2C%20achtergronden%20en%20onderzoeksjournalistiek&bn=Chrome%20146&md=true&ua=Mozilla%2F5.0%20(Linux%3B%20Android%2011%3B%20moto%20g%20power%20(2022))%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F146.0.0.0%20Mobile%20Safari%2F537.36&tz=0&tt=web&utm_source=&utm_medium=&utm_term=&utm_content=&utm_campaign=&utm_source_platform=&utm_creative_format=&utm_marketing_tactic=&bg_source=&bg_source_id=&bg_kw=&bg_campaign=&bg_aid_k=&bg_aid_v=&bg_ts= — 200 — 315 B — 646 ms — h2
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 9079ms · 1048KB · €99/mo
www.nrc.nl
Other
Costly
Execution 3846ms
Transfer 58 KB
Monthly Cost €42/mo
load.sst.nrc.nl
Other
Costly
Execution 1517ms
Transfer 166 KB
Unused 27%
Monthly Cost €16/mo
assets.nrc.nl
Other
Costly
Execution 846ms
Transfer 119 KB
Unused 65%
Monthly Cost €9/mo
Unattributable
Other
Costly
Execution 725ms
Transfer 0 KB
Monthly Cost €8/mo
load.sst.nrc.nl
Other
Costly
Execution 518ms
Transfer 162 KB
Unused 38%
Monthly Cost €6/mo
prod-nrcm.mhtr.be
Other
Costly
Execution 311ms
Transfer 159 KB
Unused 71%
Monthly Cost €3/mo
sdk.privacy-center.org
Other
Costly
Execution 255ms
Transfer 101 KB
Unused 63%
Monthly Cost €3/mo
cdn.sophi.io
Other
Costly
Execution 230ms
Transfer 41 KB
Monthly Cost €2/mo
assets.nrc.nl
Other
Optional
Execution 198ms
Transfer 89 KB
Unused 71%
Monthly Cost €2/mo
Hotjar
Session Replay
Optional
Execution 174ms
Transfer 57 KB
Unused 64%
Monthly Cost €2/mo
assets.nrc.nl
Other
Optional
Execution 171ms
Transfer 49 KB
Unused 50%
Monthly Cost €2/mo
static.chartbeat.com
Other
Optional
Execution 100ms
Transfer 16 KB
Monthly Cost €1/mo
cdn.parsely.com
Other
Optional
Execution 96ms
Transfer 21 KB
Monthly Cost €1/mo
static.chartbeat.com
Other
Optional
Execution 92ms
Transfer 10 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.nrc.nl adds 3846ms and costs ~€42/month
  • load.sst.nrc.nl adds 1517ms and costs ~€16/month
  • assets.nrc.nl adds 846ms and costs ~€9/month
  • Unattributable adds 725ms and costs ~€8/month
  • load.sst.nrc.nl adds 518ms and costs ~€6/month
  • prod-nrcm.mhtr.be adds 311ms and costs ~€3/month
  • sdk.privacy-center.org adds 255ms and costs ~€3/month
  • cdn.sophi.io adds 230ms and costs ~€2/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.nrc.nl takes 3846ms 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

load.sst.nrc.nl takes 1517ms 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.nrc.nl takes 846ms 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

65% of assets.nrc.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

Unattributable takes 725ms 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

load.sst.nrc.nl takes 518ms 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

prod-nrcm.mhtr.be takes 311ms 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

71% of prod-nrcm.mhtr.be'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

sdk.privacy-center.org takes 255ms 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 sdk.privacy-center.org'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

cdn.sophi.io takes 230ms 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

71% of assets.nrc.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

64% of Hotjar'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

50% of assets.nrc.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

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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