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https://nrc.nl

Performance

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

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

Mobile Desktop
42
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
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.

2.46 s

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

2.46 s

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

176 ms

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

0.881

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

3.06 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.

6.09 s

Page Load Progression

785 ms
1.6 s
2.4 s
3.1 s
3.9 s
4.7 s
5.5 s
6.3 s
Checks
15
6 PASS 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 119 requests
FIX
2.3 MB transferred, 119 requests
Info::
Page weighs 6.5 MB (2.3 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
Fonts are 271 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 271 KB
Warning::
119 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
119 requests
0.48 g CO2 per page load
JavaScript 1.2 MiB 51%
Images 693.2 KiB 29%
Fonts 271.2 KiB 11%
HTML 61.5 KiB 3%
CSS 44.6 KiB 2%
Other 43.6 KiB 2%
Other 37.0 KiB 2%
Other 13.7 KiB 1%
Other 316 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Why this matters

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

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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

Why this matters

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

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2441ms total JS execution
FIX
2441ms total JS execution
Warning::
https://www.nrc.nl/: 1017ms CPU time
Warning::
https://load.sst.nrc.nl/kxlupzzx.js?st=KKRPPB: 343ms CPU time
Info::
Unattributable: 236ms CPU time
Info::
https://assets.nrc.nl/static/front/js/main.db164c9...: 209ms CPU time
Info::
https://load.sst.nrc.nl/gtag/js?id=G-Q3L8E2PF4V&cx...: 133ms CPU time
Warning::
Third-party scripts: 2441ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 26% Style & Layout 15% Rendering 9% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.nrc.nl/1017ms20ms1ms3rd
https://load.sst.nrc.nl/kxlupzzx.js?st=KKRPPB343ms295ms25ms3rd
Unattributable236ms7ms0ms3rd
https://assets.nrc.nl/static/front/js/main.db164c9ed.js209ms137ms23ms3rd
https://load.sst.nrc.nl/gtag/js?id=G-Q3L8E2PF4V&cx=c&gtm=4e64k0133ms114ms17ms3rd
https://script.hotjar.com/survey-v2.8b9993fd273bc1f4ea37.js112ms75ms36ms3rd
https://prod-nrcm.mhtr.be/public/tr/tracker.min.js78ms46ms24ms3rd
https://content3.nrc.nl/script/ootag.v2.min.js76ms37ms2ms3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js66ms52ms14ms3rd
https://assets.nrc.nl/static/front/components/js/dmt-icon.2405b9fc1.js62ms45ms11ms3rd

Showing top 10 of 12 scripts

F
JS Bundles
Action
35 scripts, 515 KB unused
FIX
35 scripts, 515 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 (64%)
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: 515 KB
515 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 (64%)✓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/survey-v2.8b9993fd273bc1f4ea37.js63 KB35 KB (57%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB35 KB (62%)✓3rd
https://assets.nrc.nl/static/front/js/vendor.0677b1b4d.js49 KB24 KB (48%)✓3rd
https://static.chartbeat.com/js/chartbeat_mab.js10 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
119 resources · 2.3 MB · 515 KB savings available
FIX
119 resources · 2.3 MB · 515 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~515 KB of savings available
Warning::
118 third-party resources (100% of weight)
119 resources · 2.3 MiB · 118 third-party 1.3 MiB over 1MB target
JavaScript 51% · 1.2 MiB
Image 31% · 728.6 KiB
Font 11% · 271.2 KiB
Document 3% · 70.7 KiB
Other 2% · 50.0 KiB
CSS 2% · 44.6 KiB

~515.0 KiB of savings available

Remove unused JavaScript: 515.0 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
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
38 images 693 KB
0 oversized -0 KB
14 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
8 fonts (271 KB)
PASS
8 fonts (271 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

271 KB total

Render-blocking

0

of 8

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 2.5 s LCP 2.5 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 — 814 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 — 979 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 — 819 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 — 43.0 KiB — 234 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 — 241 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 — 273 ms — font-display: swaphttps://assets.nrc.nl/static/front/fonts/GuardianEgyp-Semibold-Web.cfd157ab0.woff2GuardianEgyp-Semibold-W... https://assets.nrc.nl/static/front/fonts/GuardianEgyp-Semibold-Web.cfd157ab0.woff2 — 32.0 KiB — 165 ms — font-display: swap
GuardianEgyp-Medium-Web... woff2 swap
Size 32 KB
Load time 814 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
GuardianEgyp-Regular-We... woff2 swap
Size 30 KB
Load time 979 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 819 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
GuardianTextEgyp-Regula... woff2 swap
Size 43 KB
Load time 234 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 241 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
GuardianEgyp-Light-Web.... woff2 swap
Size 31 KB
Load time 273 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
GuardianEgyp-Semibold-W... woff2 swap
Size 32 KB
Load time 165 ms
Start 2.9 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
119 requests over 8768ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.5 s LCP 2.5 shttps://nrc.nl// https://nrc.nl/ — 301 — 337 B — 495 ms — http/1.1https://www.nrc.nl/www.nrc.nl/ https://www.nrc.nl/ — 200 — 57.9 KiB — 826 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 — 814 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 — 979 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 — 819 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 — 664 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 — 655 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 — 657 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 — 663 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 — 659 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/-i4B3fO8tgxuulp_G33CUeLD4q0=/640x384/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22151837/220426BIN_2033207905_energieprijzen.jpgimages.nrc.nl/-i4B3fO8tgxuulp_G33CU... https://images.nrc.nl/-i4B3fO8tgxuulp_G33CUeLD4q0=/640x384/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22151837/220426BIN_2033207905_energieprijzen.jpg — 200 — 31.9 KiB — 25 ms — h2https://images.nrc.nl/ycOfe3rDc4fzK-_kS38DOdDwgb4=/640x384/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22212556/220426VER_2033231439_Loosdrecht.jpgimages.nrc.nl/ycOfe3rDc4fzK-_kS38DO... https://images.nrc.nl/ycOfe3rDc4fzK-_kS38DOdDwgb4=/640x384/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22212556/220426VER_2033231439_Loosdrecht.jpg — 200 — 54.5 KiB — 28 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 — 31.1 KiB — 485 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 — 165 ms — h2https://assets.nrc.nl/static/front/img/header-selections/foksuk.pngassets.nrc.nl/static/front/img/head... https://assets.nrc.nl/static/front/img/header-selections/foksuk.png — 200 — 3.3 KiB — 396 ms — h2https://images.nrc.nl/I57VLQZqjq6qWwsD2ZxGgy7r1MM=/0x82:5892x3617/640x384/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22211510/220426VER_2033231236_Trump.jpgimages.nrc.nl/I57VLQZqjq6qWwsD2ZxGg... https://images.nrc.nl/I57VLQZqjq6qWwsD2ZxGgy7r1MM=/0x82:5892x3617/640x384/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22211510/220426VER_2033231236_Trump.jpg — 200 — 21.1 KiB — 194 ms — h2https://images.nrc.nl/YwsdVI2fav3Hx97cujMnSR9dnug=/640x384/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22113040/220426VER_2033209413_.jpgimages.nrc.nl/YwsdVI2fav3Hx97cujMnS... https://images.nrc.nl/YwsdVI2fav3Hx97cujMnSR9dnug=/640x384/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22113040/220426VER_2033209413_.jpg — 200 — 64.0 KiB — 20 ms — h2https://images.nrc.nl/6W5m80s1fbgYfp-ajmLzB4YHmOg=/640x384/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22131111/220426BIN_2033203444_utrecht1.jpgimages.nrc.nl/6W5m80s1fbgYfp-ajmLzB... https://images.nrc.nl/6W5m80s1fbgYfp-ajmLzB4YHmOg=/640x384/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/22131111/220426BIN_2033203444_utrecht1.jpg — 200 — 64.7 KiB — 29 ms — h2https://images.nrc.nl/06EifwYSiT452ri-Kvf-PLYoiRs=/640x384/smart/filters:no_upscale():format(webp)/s3/static.nrc.nl/wp-content/uploads/2026/04/21151246/220426BIN_2033187618_asielwet.jpgimages.nrc.nl/06EifwYSiT452ri-Kvf-P... 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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 2441ms · 1033KB · €27/mo
www.nrc.nl
Other
Costly
Execution 1017ms
Transfer 58 KB
Monthly Cost €11/mo
load.sst.nrc.nl
Other
Costly
Execution 343ms
Transfer 166 KB
Unused 27%
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 236ms
Transfer 0 KB
Monthly Cost €3/mo
assets.nrc.nl
Other
Costly
Execution 209ms
Transfer 119 KB
Unused 64%
Monthly Cost €2/mo
load.sst.nrc.nl
Other
Optional
Execution 133ms
Transfer 162 KB
Unused 38%
Monthly Cost €1/mo
Hotjar
Session Replay
Optional
Execution 112ms
Transfer 63 KB
Unused 57%
Monthly Cost €1/mo
prod-nrcm.mhtr.be
Other
Optional
Execution 78ms
Transfer 159 KB
Unused 71%
Monthly Cost €1/mo
content3.nrc.nl
Other
Optional
Execution 76ms
Transfer 19 KB
Monthly Cost €1/mo
sdk.privacy-center.org
Other
Optional
Execution 66ms
Transfer 101 KB
Unused 63%
Monthly Cost €1/mo
assets.nrc.nl
Other
Optional
Execution 62ms
Transfer 89 KB
Unused 71%
Monthly Cost €1/mo
Hotjar
Session Replay
Optional
Execution 57ms
Transfer 57 KB
Unused 62%
Monthly Cost €1/mo
cdn.sophi.io
Other
Optional
Execution 52ms
Transfer 41 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.nrc.nl adds 1017ms and costs ~€11/month
  • load.sst.nrc.nl adds 343ms and costs ~€4/month
  • Unattributable adds 236ms and costs ~€3/month
  • assets.nrc.nl adds 209ms 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 1017ms 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 343ms 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 236ms 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 209ms 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 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

57% 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

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

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

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

62% 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

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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