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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

856 ms

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

1.25 s

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

2 ms

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

0.028

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

1.09 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.

2.34 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
7 PASS 3 REVIEW 3 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
52 resources · 1.5 MB · 190 KB savings available
FIX
52 resources · 1.5 MB · 190 KB savings available
Warning::
Page weight 505 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~190 KB of savings available
Warning::
51 third-party resources (100% of weight)
Info::
1 resources over 200KB
52 resources · 1.5 MiB · 51 third-party 505.0 KiB over 1MB target
Image 50% · 766.6 KiB
JavaScript 38% · 584.1 KiB
Font 5% · 83.3 KiB
CSS 4% · 58.6 KiB
Document 2% · 32.6 KiB
Other 0% · 3.8 KiB

~190.2 KiB of savings available

Remove unused JavaScript: 190.2 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
Page Weight Budget
1.5 MB transferred, 52 requests
REVIEW
1.5 MB transferred, 52 requests
Info::
Page weighs 2.9 MB (1.5 MB transferred)
Warning::
JavaScript is 584 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 584 KB
Info::
52 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
52 requests
0.31 g CO2 per page load
JavaScript 584.1 KiB 38%
Images 561.6 KiB 37%
Other 205.1 KiB 13%
Fonts 83.3 KiB 5%
CSS 58.6 KiB 4%
HTML 32.4 KiB 2%
Other 3.8 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Why this matters

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

Source: web.dev

C
JS Bundles
Action
14 scripts, 190 KB unused
REVIEW
14 scripts, 190 KB unused
Warning::
https://data.eur.nl/gjdvkyynl3.js?tg=TGXDGTQ: 91 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://data.eur.nl/gjdvkyynl3?p=a590b0a3b747f8eed...: 57 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.eur.nl/core/assets/vendor/jquery/jquer...: 42 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 190 KB
190 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://data.eur.nl/gjdvkyynl3.js?tg=TGXDGTQ197 KB91 KB (46%)✓3rd
https://data.eur.nl/gjdvkyynl3?p=a590b0a3b747f8eed9564ce5%3A87ab402c7015aa4fbe72cb2f771ba139de4fda7ffdde8f484606e3b2ee0bbb6ca485dc12f5e3ae6fd71816561be194ea183071cd30cd11a7179 KB57 KB (32%)✓3rd
https://www.eur.nl/core/assets/vendor/jquery/jquery.min.js?v=4.0.077 KB42 KB (55%)✓3rd
https://www.eur.nl/sites/corporate/files/js/js_MLNkSycuaM9Zkm1BCvAInYkD97ultS5Ur8JsVhFn-CA.js?scope=header&delta=0&language=nl&theme=corporate&include=eJx1keuSgyAMhV9I5ZGYFCKmomFCdNu332i7u8yO_QFCvlwOx8BSWEDRBV4Kr7hqHSAElki8duEKR4LM6ZqtsFMCtdp-5Bx50-u8woV3lGtYdYvP4w6CTQZmXE5OC6RLsFNEbsHWThgpK0qvnFJuy4t1M0W29_iwjBVyn2md63WOYDWhlfYPPWoQzvkDM4E3kGu4E35ZVPsJKU2tcVVlC7rZ5GFkNomdvcwHU2HP9oddxM7mUtE34ZmwCLvfk0-6-DBhmH-qt6q8uDCxNbEeNqf6m1A0axuukBKKec5nNIJChieKw_2w_AwWS2Bzjer5592_ezdCcLYGW-3Zl7wl-sMLyHyvPsS1O6yo7twHuMPjFfDH0U9kwuTp3t9v5pAV3w26 KB—✓3rd
https://www.eur.nl/sites/corporate/files/js/js_azOI-UzUW2Y0OP43fKXJTwrNiq4hWcGH1lGvbACD2Hs.js?scope=footer&delta=1&language=nl&theme=corporate&include=eJx1keuSgyAMhV9I5ZGYFCKmomFCdNu332i7u8yO_QFCvlwOx8BSWEDRBV4Kr7hqHSAElki8duEKR4LM6ZqtsFMCtdp-5Bx50-u8woV3lGtYdYvP4w6CTQZmXE5OC6RLsFNEbsHWThgpK0qvnFJuy4t1M0W29_iwjBVyn2md63WOYDWhlfYPPWoQzvkDM4E3kGu4E35ZVPsJKU2tcVVlC7rZ5GFkNomdvcwHU2HP9oddxM7mUtE34ZmwCLvfk0-6-DBhmH-qt6q8uDCxNbEeNqf6m1A0axuukBKKec5nNIJChieKw_2w_AwWS2Bzjer5592_ezdCcLYGW-3Zl7wl-sMLyHyvPsS1O6yo7twHuMPjFfDH0U9kwuTp3t9v5pAV3w22 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/mark.js/8.11.1/jquery.mark.min.js5 KB—✓3rd
https://www.eur.nl/sites/corporate/files/js/js_fUCzectxpENjYAQ29Y_KigxtiNEwemr_y3X2dFSkJxQ.js?scope=footer&delta=3&language=nl&theme=corporate&include=eJx1keuSgyAMhV9I5ZGYFCKmomFCdNu332i7u8yO_QFCvlwOx8BSWEDRBV4Kr7hqHSAElki8duEKR4LM6ZqtsFMCtdp-5Bx50-u8woV3lGtYdYvP4w6CTQZmXE5OC6RLsFNEbsHWThgpK0qvnFJuy4t1M0W29_iwjBVyn2md63WOYDWhlfYPPWoQzvkDM4E3kGu4E35ZVPsJKU2tcVVlC7rZ5GFkNomdvcwHU2HP9oddxM7mUtE34ZmwCLvfk0-6-DBhmH-qt6q8uDCxNbEeNqf6m1A0axuukBKKec5nNIJChieKw_2w_AwWS2Bzjer5592_ezdCcLYGW-3Zl7wl-sMLyHyvPsS1O6yo7twHuMPjFfDH0U9kwuTp3t9v5pAV3w21 KB—✓3rd
https://www.eur.nl/modules/custom/eur_custom/js/taggers.io.js?v=1.x1 KB—✓3rd
https://consent.studio/www.eur.nl/banner.js38 KB—✓3rd
https://www.eur.nl/sites/corporate/files/js/js_7SPyGCFvNyNgWnRFnTivYX3JCk7hKdkEme55Ql23Q7s.js?scope=header&delta=2&language=nl&theme=corporate&include=eJx1keuSgyAMhV9I5ZGYFCKmomFCdNu332i7u8yO_QFCvlwOx8BSWEDRBV4Kr7hqHSAElki8duEKR4LM6ZqtsFMCtdp-5Bx50-u8woV3lGtYdYvP4w6CTQZmXE5OC6RLsFNEbsHWThgpK0qvnFJuy4t1M0W29_iwjBVyn2md63WOYDWhlfYPPWoQzvkDM4E3kGu4E35ZVPsJKU2tcVVlC7rZ5GFkNomdvcwHU2HP9oddxM7mUtE34ZmwCLvfk0-6-DBhmH-qt6q8uDCxNbEeNqf6m1A0axuukBKKec5nNIJChieKw_2w_AwWS2Bzjer5592_ezdCcLYGW-3Zl7wl-sMLyHyvPsS1O6yo7twHuMPjFfDH0U9kwuTp3t9v5pAV3w2 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

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+
Image Optimization
24 images, 0 KB saveable
PASS
24 images, 0 KB saveable
Info::
All images are well-optimized
24 images 562 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
306ms total JS execution
PASS
306ms total JS execution
Info::
https://data.eur.nl/gjdvkyynl3?p=a590b0a3b747f8eed...: 91ms CPU time
Info::
Unattributable: 81ms CPU time
Info::
https://data.eur.nl/gjdvkyynl3.js?tg=TGXDGTQ: 68ms CPU time
Info::
https://www.eur.nl/: 66ms CPU time
Warning::
Third-party scripts: 306ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 22% Style & Layout 15% Script Parsing & Compilation 9% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://data.eur.nl/gjdvkyynl3?p=a590b0a3b747f8eed9564ce5%3A87ab402c7015aa4fbe72cb2f771ba139de4fda7ffdde8f484606e3b2ee0bbb6ca485dc12f5e3ae6fd71816561be194ea183071cd30cd11a791ms80ms10ms3rd
Unattributable81ms2ms0ms3rd
https://data.eur.nl/gjdvkyynl3.js?tg=TGXDGTQ68ms53ms13ms3rd
https://www.eur.nl/66ms1ms0ms3rd
A+
Font Loading
4 fonts (83 KB)
PASS
4 fonts (83 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

83 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 856 ms LCP 1.2 shttps://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-300-webfont.woff2museosans-300-webfont.w... https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-300-webfont.woff2 — 20.8 KiB — 134 ms — font-display: swaphttps://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-500-webfont.woff2museosans-500-webfont.w... https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-500-webfont.woff2 — 20.9 KiB — 136 ms — font-display: swaphttps://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-700-webfont.woff2museosans-700-webfont.w... https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-700-webfont.woff2 — 20.9 KiB — 139 ms — font-display: swaphttps://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-900-webfont.woff2museosans-900-webfont.w... https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-900-webfont.woff2 — 20.7 KiB — 141 ms — font-display: swap
museosans-300-webfont.w... woff2 swap
Size 21 KB
Load time 134 ms
Start 234 ms
Risk FOUT — text flashes from fallback to web font
museosans-500-webfont.w... woff2 swap
Size 21 KB
Load time 136 ms
Start 235 ms
Risk FOUT — text flashes from fallback to web font
museosans-700-webfont.w... woff2 swap
Size 21 KB
Load time 139 ms
Start 235 ms
Risk FOUT — text flashes from fallback to web font
museosans-900-webfont.w... woff2 swap
Size 21 KB
Load time 141 ms
Start 236 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
52 requests over 1823ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 856 ms LCP 1.2 shttps://eur.nl// https://eur.nl/ — 301 — 128 B — 109 ms — http/1.1https://www.eur.nl/www.eur.nl/ https://www.eur.nl/ — 200 — 32.4 KiB — 149 ms — http/1.1https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-300-webfont.woff2www.eur.nl/themes/custom/corporate/... https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-300-webfont.woff2 — 200 — 20.8 KiB — 134 ms — http/1.1https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-500-webfont.woff2www.eur.nl/themes/custom/corporate/... https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-500-webfont.woff2 — 200 — 20.9 KiB — 136 ms — http/1.1https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-700-webfont.woff2www.eur.nl/themes/custom/corporate/... https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-700-webfont.woff2 — 200 — 20.9 KiB — 139 ms — http/1.1https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-900-webfont.woff2www.eur.nl/themes/custom/corporate/... https://www.eur.nl/themes/custom/corporate/dist/fonts/museosans-900-webfont.woff2 — 200 — 20.7 KiB — 141 ms — http/1.1https://www.eur.nl/system/files/styles/responsive_w1450_r21_8/private/lytho/67b4b784a4616e31866f3fbb-1.jpg.avif?h=6f9a23ba&itok=0WSn0wQpwww.eur.nl/system/files/styles/resp... https://www.eur.nl/system/files/styles/responsive_w1450_r21_8/private/lytho/67b4b784a4616e31866f3fbb-1.jpg.avif?h=6f9a23ba&itok=0WSn0wQp — 200 — 122.5 KiB — 314 ms — http/1.1https://www.eur.nl/sites/corporate/files/js/js_MLNkSycuaM9Zkm1BCvAInYkD97ultS5Ur8JsVhFn-CA.js?scope=header&delta=0&language=nl&theme=corporate&include=eJx1keuSgyAMhV9I5ZGYFCKmomFCdNu332i7u8yO_QFCvlwOx8BSWEDRBV4Kr7hqHSAElki8duEKR4LM6ZqtsFMCtdp-5Bx50-u8woV3lGtYdYvP4w6CTQZmXE5OC6RLsFNEbsHWThgpK0qvnFJuy4t1M0W29_iwjBVyn2md63WOYDWhlfYPPWoQzvkDM4E3kGu4E35ZVPsJKU2tcVVlC7rZ5GFkNomdvcwHU2HP9oddxM7mUtE34ZmwCLvfk0-6-DBhmH-qt6q8uDCxNbEeNqf6m1A0axuukBKKec5nNIJChieKw_2w_AwWS2Bzjer5592_ezdCcLYGW-3Zl7wl-sMLyHyvPsS1O6yo7twHuMPjFfDH0U9kwuTp3t9v5pAV3wwww.eur.nl/sites/corporate/files/js... https://www.eur.nl/sites/corporate/files/js/js_MLNkSycuaM9Zkm1BCvAInYkD97ultS5Ur8JsVhFn-CA.js?scope=header&delta=0&language=nl&theme=corporate&include=eJx1keuSgyAMhV9I5ZGYFCKmomFCdNu332i7u8yO_QFCvlwOx8BSWEDRBV4Kr7hqHSAElki8duEKR4LM6ZqtsFMCtdp-5Bx50-u8woV3lGtYdYvP4w6CTQZmXE5OC6RLsFNEbsHWThgpK0qvnFJuy4t1M0W29_iwjBVyn2md63WOYDWhlfYPPWoQzvkDM4E3kGu4E35ZVPsJKU2tcVVlC7rZ5GFkNomdvcwHU2HP9oddxM7mUtE34ZmwCLvfk0-6-DBhmH-qt6q8uDCxNbEeNqf6m1A0axuukBKKec5nNIJChieKw_2w_AwWS2Bzjer5592_ezdCcLYGW-3Zl7wl-sMLyHyvPsS1O6yo7twHuMPjFfDH0U9kwuTp3t9v5pAV3w — 200 — 25.9 KiB — 155 ms — http/1.1https://www.eur.nl/modules/custom/eur_consent_studio/js/banner.js?tdx2s1www.eur.nl/modules/custom/eur_conse... https://www.eur.nl/modules/custom/eur_consent_studio/js/banner.js?tdx2s1 — 200 — 2.5 KiB — 154 ms — http/1.1https://www.eur.nl/sites/corporate/files/js/js_7SPyGCFvNyNgWnRFnTivYX3JCk7hKdkEme55Ql23Q7s.js?scope=header&delta=2&language=nl&theme=corporate&include=eJx1keuSgyAMhV9I5ZGYFCKmomFCdNu332i7u8yO_QFCvlwOx8BSWEDRBV4Kr7hqHSAElki8duEKR4LM6ZqtsFMCtdp-5Bx50-u8woV3lGtYdYvP4w6CTQZmXE5OC6RLsFNEbsHWThgpK0qvnFJuy4t1M0W29_iwjBVyn2md63WOYDWhlfYPPWoQzvkDM4E3kGu4E35ZVPsJKU2tcVVlC7rZ5GFkNomdvcwHU2HP9oddxM7mUtE34ZmwCLvfk0-6-DBhmH-qt6q8uDCxNbEeNqf6m1A0axuukBKKec5nNIJChieKw_2w_AwWS2Bzjer5592_ezdCcLYGW-3Zl7wl-sMLyHyvPsS1O6yo7twHuMPjFfDH0U9kwuTp3t9v5pAV3wwww.eur.nl/sites/corporate/files/js... https://www.eur.nl/sites/corporate/files/js/js_7SPyGCFvNyNgWnRFnTivYX3JCk7hKdkEme55Ql23Q7s.js?scope=header&delta=2&language=nl&theme=corporate&include=eJx1keuSgyAMhV9I5ZGYFCKmomFCdNu332i7u8yO_QFCvlwOx8BSWEDRBV4Kr7hqHSAElki8duEKR4LM6ZqtsFMCtdp-5Bx50-u8woV3lGtYdYvP4w6CTQZmXE5OC6RLsFNEbsHWThgpK0qvnFJuy4t1M0W29_iwjBVyn2md63WOYDWhlfYPPWoQzvkDM4E3kGu4E35ZVPsJKU2tcVVlC7rZ5GFkNomdvcwHU2HP9oddxM7mUtE34ZmwCLvfk0-6-DBhmH-qt6q8uDCxNbEeNqf6m1A0axuukBKKec5nNIJChieKw_2w_AwWS2Bzjer5592_ezdCcLYGW-3Zl7wl-sMLyHyvPsS1O6yo7twHuMPjFfDH0U9kwuTp3t9v5pAV3w — 200 — 1.6 KiB — 154 ms — 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http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 306ms · 408KB · €3/mo
data.eur.nl
Other
Optional
Execution 91ms
Transfer 179 KB
Unused 32%
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 81ms
Transfer 0 KB
Monthly Cost €1/mo
data.eur.nl
Other
Optional
Execution 68ms
Transfer 197 KB
Unused 46%
Monthly Cost €1/mo
www.eur.nl
Other
Optional
Execution 66ms
Transfer 32 KB
Monthly Cost €1/mo

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

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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