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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
0
PASS
9
INFO
2

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

Mobile Desktop
35
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

7.93 s

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

19.06 s

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

950 ms

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

0.015

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

10.24 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.

19.44 s

Page Load Progression

600 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
17
9 PASS 6 FIX
F
Page Weight Budget
Action
14.1 MB transferred, 105 requests
FIX
14.1 MB transferred, 105 requests
Critical::
Page weighs 17.8 MB (14.1 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
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
Warning::
105 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.9 g CO2 per page load
14.1 MB / 2.4 MB budget
14.1 MB transferred
105 requests
2.9 g CO2 per page load
Other 10.9 MiB 77%
Images 1.6 MiB 11%
JavaScript 1.3 MiB 9%
CSS 128.8 KiB 1%
Fonts 119.2 KiB 1%
HTML 54.4 KiB 0%
Other 16.0 KiB 0%
Other 11.0 KiB 0%
Other 3.9 KiB 0%
Other 774 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 (14.1 MiB of 14.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5479ms total JS execution
FIX
5479ms total JS execution
Warning::
https://www.wur.nl/_next/static/chunks/2335-d57585...: 1399ms CPU time
Warning::
Unattributable: 907ms CPU time
Warning::
https://www.wur.nl/_next/static/chunks/539-9495a85...: 618ms CPU time
Warning::
https://www.wur.nl/: 504ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NEFT...: 411ms CPU time
Warning::
Third-party scripts: 5479ms (100% of total)

Main Thread Breakdown

Script Evaluation 58% Other 20% Style & Layout 9% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.wur.nl/_next/static/chunks/2335-d5758543638a58fa.js1399ms1208ms12ms3rd
Unattributable907ms17ms0ms3rd
https://www.wur.nl/_next/static/chunks/539-9495a8503e4583f3.js618ms334ms6ms3rd
https://www.wur.nl/504ms18ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NEFT7JF7MC&cx=c&gtm=4e64h1411ms370ms36ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K7XXNHCQ408ms353ms35ms3rd
https://web.cmp.usercentrics.eu/ui/v/3.116.0/WebSdk.lib.d00a93b7.js178ms153ms21ms3rd
https://www.wur.nl/_next/static/chunks/main-app-50abba8a4dad0d88.js151ms150ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-SZ1PQDSPJD&cx=c&gtm=4e64h1147ms115ms31ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-1052975880&cx=c&gtm=4e64h1142ms105ms36ms3rd

Showing top 10 of 17 scripts

D
JS Bundles
Action
34 scripts, 405 KB unused
FIX
34 scripts, 405 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NEFT...: 68 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-105...: 64 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-SZ1P...: 62 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-K7X...: 56 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.wur.nl/_next/static/chunks/6596-f93e7a...: 41 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 405 KB
405 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-NEFT7JF7MC&cx=c&gtm=4e64h1166 KB68 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1052975880&cx=c&gtm=4e64h1146 KB64 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-SZ1PQDSPJD&cx=c&gtm=4e64h1153 KB62 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K7XXNHCQ142 KB56 KB (39%)✓3rd
https://www.wur.nl/_next/static/chunks/6596-f93e7ac5f041dc0f.js58 KB41 KB (74%)✓3rd
https://web.cmp.usercentrics.eu/ui/v/3.116.0/WebSdk.lib.d00a93b7.js56 KB35 KB (63%)✓3rd
https://s.go-mpulse.net/boomerang/HZTZB-UDRJS-BUKQR-5PDD9-FKVHX60 KB34 KB (56%)✓3rd
https://www.wur.nl/_next/static/chunks/1781-fa15cf45b3b9ed9c.js45 KB24 KB (57%)✓3rd
https://www.wur.nl/_next/static/chunks/5199-6bc7c3917f818100.js44 KB22 KB (54%)✓3rd
https://www.wur.nl/_next/static/chunks/app/%5Blocale%5D/error-fc09d2af517d7c8f.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
105 resources · 14.1 MB · 405 KB savings available
FIX
105 resources · 14.1 MB · 405 KB savings available
Warning::
Page weight 13.1 MB over 1MB target
Got: 14.1 MB Expected: ≤ 1 MB
Info::
~405 KB of savings available
Warning::
104 third-party resources (100% of weight)
Info::
2 resources over 200KB
105 resources · 14.1 MiB · 104 third-party 13.1 MiB over 1MB target
Media 77% · 10.9 MiB
Image 11% · 1.6 MiB
JavaScript 9% · 1.3 MiB
CSS 1% · 128.8 KiB
Font 1% · 119.2 KiB
Document 0% · 54.5 KiB
Other 0% · 17.4 KiB

~405.4 KiB of savings available

Remove unused JavaScript: 405.4 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.

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
Image Optimization
29 images, 0 KB saveable
PASS
29 images, 0 KB saveable
Info::
All images are well-optimized
29 images 1.6 MB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (119 KB)
PASS
3 fonts (119 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

119 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 7.9 s LCP 19.1 shttps://www.wur.nl/_next/static/media/94aa5fe8d36eeae8-s.p.woff294aa5fe8d36eeae8-s.p.woff2 https://www.wur.nl/_next/static/media/94aa5fe8d36eeae8-s.p.woff2 — 42.6 KiB — 17 ms — font-display: swaphttps://www.wur.nl/_next/static/media/aa924b7c62245c84-s.p.woff2aa924b7c62245c84-s.p.woff2 https://www.wur.nl/_next/static/media/aa924b7c62245c84-s.p.woff2 — 39.2 KiB — 41 ms — font-display: swaphttps://www.wur.nl/_next/static/media/e7b5e188fed5a3c0-s.p.woff2e7b5e188fed5a3c0-s.p.woff2 https://www.wur.nl/_next/static/media/e7b5e188fed5a3c0-s.p.woff2 — 37.4 KiB — 51 ms — font-display: swap
94aa5fe8d36eeae8-s.p.woff2 woff2 swap
Size 43 KB
Load time 17 ms
Start 321 ms
Risk FOUT — text flashes from fallback to web font
aa924b7c62245c84-s.p.woff2 woff2 swap
Size 39 KB
Load time 41 ms
Start 323 ms
Risk FOUT — text flashes from fallback to web font
e7b5e188fed5a3c0-s.p.woff2 woff2 swap
Size 37 KB
Load time 51 ms
Start 323 ms
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
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
Page uses 8 resource hint(s)

Current Resource Hints

preconnect
—
preload
8
dns-prefetch
—
prefetch
—

8 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: Combell

Network Waterfall
105 requests over 2106ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 7.9 s LCP 19.1 shttps://wur.nl// https://wur.nl/ — 301 — 108 B — 92 ms — h2https://www.wur.nl/www.wur.nl/ https://www.wur.nl/ — 200 — 53.3 KiB — 208 ms — h2https://www.wur.nl/_next/static/media/94aa5fe8d36eeae8-s.p.woff2www.wur.nl/_next/static/media/94aa5... https://www.wur.nl/_next/static/media/94aa5fe8d36eeae8-s.p.woff2 — 200 — 42.6 KiB — 17 ms — h2https://www.wur.nl/_next/static/media/aa924b7c62245c84-s.p.woff2www.wur.nl/_next/static/media/aa924... https://www.wur.nl/_next/static/media/aa924b7c62245c84-s.p.woff2 — 200 — 39.2 KiB — 41 ms — h2https://www.wur.nl/_next/static/media/e7b5e188fed5a3c0-s.p.woff2www.wur.nl/_next/static/media/e7b5e... https://www.wur.nl/_next/static/media/e7b5e188fed5a3c0-s.p.woff2 — 200 — 37.4 KiB — 51 ms — h2https://www.wur.nl/_next/static/css/bdba618fb534b563.csswww.wur.nl/_next/static/css/bdba618... https://www.wur.nl/_next/static/css/bdba618fb534b563.css — 200 — 5.0 KiB — 55 ms — h2https://www.wur.nl/_next/static/css/8ca3737bbb399e28.csswww.wur.nl/_next/static/css/8ca3737... https://www.wur.nl/_next/static/css/8ca3737bbb399e28.css — 200 — 4.4 KiB — 71 ms — h2https://www.wur.nl/_next/static/css/619effdcccc27ef2.csswww.wur.nl/_next/static/css/619effd... https://www.wur.nl/_next/static/css/619effdcccc27ef2.css — 200 — 3.7 KiB — 139 ms — h2https://www.wur.nl/_next/static/css/4af1023cd5236f9e.csswww.wur.nl/_next/static/css/4af1023... https://www.wur.nl/_next/static/css/4af1023cd5236f9e.css — 200 — 3.9 KiB — 65 ms — h2https://www.wur.nl/_next/static/css/16bbc6495a8999f5.csswww.wur.nl/_next/static/css/16bbc64... https://www.wur.nl/_next/static/css/16bbc6495a8999f5.css — 200 — 3.7 KiB — 174 ms — h2https://www.wur.nl/_next/static/css/07426c9d193a0e07.csswww.wur.nl/_next/static/css/07426c9... https://www.wur.nl/_next/static/css/07426c9d193a0e07.css — 200 — 5.3 KiB — 72 ms — h2https://www.wur.nl/_next/static/css/60f24d543931b8f2.csswww.wur.nl/_next/static/css/60f24d5... https://www.wur.nl/_next/static/css/60f24d543931b8f2.css — 200 — 4.7 KiB — 38 ms — h2https://www.wur.nl/_next/static/css/9257b424a42e433f.csswww.wur.nl/_next/static/css/9257b42... https://www.wur.nl/_next/static/css/9257b424a42e433f.css — 200 — 16.0 KiB — 36 ms — h2https://www.wur.nl/_next/static/css/c5ad1877aee16027.csswww.wur.nl/_next/static/css/c5ad187... https://www.wur.nl/_next/static/css/c5ad1877aee16027.css — 200 — 7.9 KiB — 55 ms — h2https://www.wur.nl/_next/static/css/03719ac415666dac.csswww.wur.nl/_next/static/css/03719ac... https://www.wur.nl/_next/static/css/03719ac415666dac.css — 200 — 5.3 KiB — 39 ms — h2https://www.wur.nl/_next/static/css/46ce895afd25d99b.csswww.wur.nl/_next/static/css/46ce895... https://www.wur.nl/_next/static/css/46ce895afd25d99b.css — 200 — 4.2 KiB — 145 ms — h2https://www.wur.nl/_next/static/css/f3632b80562d12d6.csswww.wur.nl/_next/static/css/f3632b8... https://www.wur.nl/_next/static/css/f3632b80562d12d6.css — 200 — 3.5 KiB — 150 ms — h2https://www.wur.nl/_next/static/css/059327facfb11e25.csswww.wur.nl/_next/static/css/059327f... https://www.wur.nl/_next/static/css/059327facfb11e25.css — 200 — 3.8 KiB — 41 ms — h2https://www.wur.nl/_next/static/css/122641a95ac71aaf.csswww.wur.nl/_next/static/css/122641a... https://www.wur.nl/_next/static/css/122641a95ac71aaf.css — 200 — 4.0 KiB — 64 ms — h2https://www.wur.nl/_next/static/css/778a65dcc3570b8c.csswww.wur.nl/_next/static/css/778a65d... https://www.wur.nl/_next/static/css/778a65dcc3570b8c.css — 200 — 3.9 KiB — 66 ms — h2https://www.wur.nl/_next/static/css/f0c0df55d30888b0.csswww.wur.nl/_next/static/css/f0c0df5... https://www.wur.nl/_next/static/css/f0c0df55d30888b0.css — 200 — 5.2 KiB — 42 ms — h2https://www.wur.nl/_next/static/css/f0e600172e413850.csswww.wur.nl/_next/static/css/f0e6001... https://www.wur.nl/_next/static/css/f0e600172e413850.css — 200 — 4.6 KiB — 47 ms — h2https://www.wur.nl/_next/static/css/fd6c09d4cbd97f01.csswww.wur.nl/_next/static/css/fd6c09d... https://www.wur.nl/_next/static/css/fd6c09d4cbd97f01.css — 200 — 4.9 KiB — 49 ms — h2https://www.wur.nl/_next/static/css/15316b2e324e14a4.csswww.wur.nl/_next/static/css/15316b2... https://www.wur.nl/_next/static/css/15316b2e324e14a4.css — 200 — 5.8 KiB — 71 ms — h2https://www.wur.nl/_next/static/css/b6d76028b7622f27.csswww.wur.nl/_next/static/css/b6d7602... https://www.wur.nl/_next/static/css/b6d76028b7622f27.css — 200 — 4.7 KiB — 55 ms — h2https://www.wur.nl/_next/static/css/036daff25aaa15d8.csswww.wur.nl/_next/static/css/036daff... https://www.wur.nl/_next/static/css/036daff25aaa15d8.css — 200 — 12.5 KiB — 59 ms — h2https://www.wur.nl/_next/static/css/d998ddb7e0239424.csswww.wur.nl/_next/static/css/d998ddb... https://www.wur.nl/_next/static/css/d998ddb7e0239424.css — 200 — 7.6 KiB — 56 ms — h2https://www.wur.nl/_next/static/css/33eca90edb722b57.csswww.wur.nl/_next/static/css/33eca90... https://www.wur.nl/_next/static/css/33eca90edb722b57.css — 200 — 4.1 KiB — 43 ms — h2https://web.cmp.usercentrics.eu/modules/autoblocker.jsweb.cmp.usercentrics.eu/modules/aut... https://web.cmp.usercentrics.eu/modules/autoblocker.js — 200 — 19.9 KiB — 100 ms — h2https://web.cmp.usercentrics.eu/ui/loader.jsweb.cmp.usercentrics.eu/ui/loader.j... https://web.cmp.usercentrics.eu/ui/loader.js — 200 — 15.1 KiB — 112 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 7.9 s LCP 19.1 shttps://wur.nl// https://wur.nl/ — 301 — 108 B — 92 ms — h2https://www.wur.nl/www.wur.nl/ https://www.wur.nl/ — 200 — 53.3 KiB — 208 ms — h2https://www.wur.nl/_next/static/media/94aa5fe8d36eeae8-s.p.woff2www.wur.nl/_next/static/media/94aa5... https://www.wur.nl/_next/static/media/94aa5fe8d36eeae8-s.p.woff2 — 200 — 42.6 KiB — 17 ms — h2https://www.wur.nl/_next/static/media/aa924b7c62245c84-s.p.woff2www.wur.nl/_next/static/media/aa924... https://www.wur.nl/_next/static/media/aa924b7c62245c84-s.p.woff2 — 200 — 39.2 KiB — 41 ms — h2https://www.wur.nl/_next/static/media/e7b5e188fed5a3c0-s.p.woff2www.wur.nl/_next/static/media/e7b5e... https://www.wur.nl/_next/static/media/e7b5e188fed5a3c0-s.p.woff2 — 200 — 37.4 KiB — 51 ms — h2https://www.wur.nl/_next/static/css/bdba618fb534b563.csswww.wur.nl/_next/static/css/bdba618... https://www.wur.nl/_next/static/css/bdba618fb534b563.css — 200 — 5.0 KiB — 55 ms — 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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 5479ms · 1029KB · €59/mo
www.wur.nl
Other
Costly
Execution 1399ms
Transfer 49 KB
Monthly Cost €15/mo
Unattributable
Other
Costly
Execution 907ms
Transfer 0 KB
Monthly Cost €10/mo
www.wur.nl
Other
Costly
Execution 618ms
Transfer 25 KB
Monthly Cost €7/mo
www.wur.nl
Other
Costly
Execution 504ms
Transfer 53 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 411ms
Transfer 166 KB
Unused 41%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 408ms
Transfer 142 KB
Unused 39%
Monthly Cost €4/mo
web.cmp.usercentrics.eu
Other
Optional
Execution 178ms
Transfer 56 KB
Unused 63%
Monthly Cost €2/mo
www.wur.nl
Other
Optional
Execution 151ms
Transfer 4 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 147ms
Transfer 153 KB
Unused 41%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 142ms
Transfer 146 KB
Unused 44%
Monthly Cost €2/mo
www.wur.nl
Other
Optional
Execution 127ms
Transfer 4 KB
Monthly Cost €1/mo
web.cmp.usercentrics.eu
Other
Optional
Execution 103ms
Transfer 18 KB
Monthly Cost €1/mo
web.cmp.usercentrics.eu
Other
Optional
Execution 93ms
Transfer 15 KB
Monthly Cost €1/mo
www.wur.nl
Other
Optional
Execution 79ms
Transfer 57 KB
Monthly Cost €1/mo
web.cmp.usercentrics.eu
Other
Optional
Execution 76ms
Transfer 20 KB
Monthly Cost €1/mo
www.wur.nl
Other
Optional
Execution 72ms
Transfer 45 KB
Unused 57%
Monthly Cost €1/mo
www.wur.nl
Other
Optional
Execution 64ms
Transfer 77 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.wur.nl adds 1399ms and costs ~€15/month
  • Unattributable adds 907ms and costs ~€10/month
  • www.wur.nl adds 618ms and costs ~€7/month
  • www.wur.nl adds 504ms and costs ~€5/month
  • Google Tag Manager adds 411ms and costs ~€4/month
  • Google Tag Manager adds 408ms and costs ~€4/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.wur.nl takes 1399ms 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 907ms 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.wur.nl takes 618ms 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.wur.nl takes 504ms 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 411ms 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 408ms 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 web.cmp.usercentrics.eu'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 www.wur.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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