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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
3
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
48
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.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

8.17 s

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

14.34 s

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

380 ms

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

0.000

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

8.17 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.

14.34 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
17
7 PASS 5 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 (1.3 MiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
52 scripts, 325 KB unused
FIX
52 scripts, 325 KB unused
Warning::
https://www.googletagmanager.com/gtag/destination?...: 69 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-JN37...: 62 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WBQ...: 61 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.google.com/cse/static/element/dc329f57...: 53 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cse.google.com/adsense/search/async-ads.js: 32 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 325 KB
325 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/destination?id=AW-940554233&cx=c&gtm=4e64h1h1134 KB69 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-JN37M497TT&cx=c&gtm=4e64h1h1175 KB62 KB (35%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WBQSX3177 KB61 KB (35%)✓3rd
https://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3D103 KB53 KB (52%)✓3rd
https://cse.google.com/adsense/search/async-ads.js44 KB32 KB (73%)✓3rd
https://consent.cookiebot.com/98814da8-7f29-402a-aecd-dcff795567be/cc.js?renew=false&referer=www.tue.nl&dnt=false&init=false&culture=en108 KB26 KB (24%)✓3rd
https://consent.cookiebot.com/uc.js?cbid=98814da8-7f29-402a-aecd-dcff795567be&implementation=gtm&consentmode-dataredaction=dynamic&culture=en36 KB23 KB (64%)✓3rd
https://www.tue.nl/typo3conf/ext/tue_menu/Resources/Public/JavaScript/sideMainMenu.js?17742763941 KB—✓3rd
https://www.tue.nl/typo3conf/ext/tue_styling/Resources/Public/JavaScript/Vendor/objectfit.min.js?17742763022 KB—✓3rd
https://www.tue.nl/typo3conf/ext/ufe_donations/Resources/Public/JavaScript/donationForm.js?17742763023 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
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
1.3 MB transferred, 89 requests
REVIEW
1.3 MB transferred, 89 requests
Info::
Page weighs 3.7 MB (1.3 MB transferred)
Warning::
JavaScript is 950 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 950 KB
Info::
89 HTTP requests
Info::
Estimated 0.27 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
89 requests
0.27 g CO2 per page load
JavaScript 949.7 KiB 72%
Images 104.6 KiB 8%
Fonts 96.7 KiB 7%
CSS 84.6 KiB 6%
Other 55.5 KiB 4%
HTML 15.7 KiB 1%
Other 10.1 KiB 1%
Other 1.3 KiB 0%
0 2.4 MB 4.9 MB
Under budget

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

B
Image Optimization
7 images, 0 KB saveable
REVIEW
7 images, 0 KB saveable
Info::
All images are well-optimized
7 images 105 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1948ms total JS execution
REVIEW
1948ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WBQ...: 335ms CPU time
Warning::
Unattributable: 332ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-JN37...: 329ms CPU time
Warning::
https://consent.cookiebot.com/uc.js?cbid=98814da8-...: 313ms CPU time
Info::
https://cse.google.com/cse.js?cx=00082795610716231...: 178ms CPU time
Warning::
Third-party scripts: 1948ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Other 16% Script Parsing & Compilation 12% Style & Layout 10% Parse HTML & CSS 7%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-WBQSX3335ms281ms49ms3rd
Unattributable332ms14ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-JN37M497TT&cx=c&gtm=4e64h1h1329ms273ms54ms3rd
https://consent.cookiebot.com/uc.js?cbid=98814da8-7f29-402a-aecd-dcff795567be&implementation=gtm&consentmode-dataredaction=dynamic&culture=en313ms184ms11ms3rd
https://cse.google.com/cse.js?cx=000827956107162310916:9hfn0dhtcpu178ms79ms1ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-940554233&cx=c&gtm=4e64h1h1128ms97ms30ms3rd
https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/jquery-1_11_2.js?1774276394102ms76ms8ms3rd
https://www.tue.nl/en/99ms5ms2ms3rd
https://cse.google.com/adsense/search/async-ads.js79ms38ms36ms3rd
https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/Foundation/foundation.js?177427639453ms17ms1ms3rd
C
Page Weight Inventory
Action
89 resources · 1.3 MB · 325 KB savings available
REVIEW
89 resources · 1.3 MB · 325 KB savings available
Warning::
Page weight 294 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~325 KB of savings available
Warning::
88 third-party resources (100% of weight)
89 resources · 1.3 MiB · 88 third-party 294.2 KiB over 1MB target
JavaScript 72% · 949.7 KiB
Image 12% · 158.5 KiB
Font 7% · 96.7 KiB
CSS 6% · 84.6 KiB
Document 1% · 16.4 KiB
Other 1% · 12.3 KiB

~325.0 KiB of savings available

Remove unused JavaScript: 325.0 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
4 fonts (97 KB)
PASS
4 fonts (97 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

97 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 8.2 s LCP 14.3 shttps://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/Fonts/lato-bold.woff2lato-bold.woff2 https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/Fonts/lato-bold.woff2 — 22.9 KiB — 174 ms — font-display: swaphttps://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/Fonts/lato-regular.woff2lato-regular.woff2 https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/Fonts/lato-regular.woff2 — 23.3 KiB — 171 ms — font-display: swaphttps://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/Fonts/Gilroy-ExtraBold.woff2Gilroy-ExtraBold.woff2 https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/Fonts/Gilroy-ExtraBold.woff2 — 25.0 KiB — 172 ms — font-display: swaphttps://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/Fonts/Gilroy-Light.woff2Gilroy-Light.woff2 https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/Fonts/Gilroy-Light.woff2 — 25.5 KiB — 180 ms — font-display: swap
lato-bold.woff2 woff2 swap
Size 23 KB
Load time 174 ms
Start 927 ms
Risk FOUT — text flashes from fallback to web font
lato-regular.woff2 woff2 swap
Size 23 KB
Load time 171 ms
Start 928 ms
Risk FOUT — text flashes from fallback to web font
Gilroy-ExtraBold.woff2 woff2 swap
Size 25 KB
Load time 172 ms
Start 928 ms
Risk FOUT — text flashes from fallback to web font
Gilroy-Light.woff2 woff2 swap
Size 26 KB
Load time 180 ms
Start 929 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
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
Network Waterfall
89 requests over 2897ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 8.2 s LCP 14.3 shttps://tue.nl// https://tue.nl/ — 301 — 110 B — 111 ms — http/1.1https://www.tue.nl/www.tue.nl/ https://www.tue.nl/ — 301 — 604 B — 70 ms — h2https://www.tue.nl/en/www.tue.nl/en/ https://www.tue.nl/en/ — 200 — 9.2 KiB — 55 ms — h2https://www.tue.nl/typo3temp/assets/css/7015c8c4ac5ff815b57530b221005fc6.css?1776402803www.tue.nl/typo3temp/assets/css/701... https://www.tue.nl/typo3temp/assets/css/7015c8c4ac5ff815b57530b221005fc6.css?1776402803 — 200 — 1.4 KiB — 146 ms — h2https://www.tue.nl/typo3conf/ext/cookie_notice/Resources/Public/Styles/CookieNotice.css?1665669388www.tue.nl/typo3conf/ext/cookie_not... https://www.tue.nl/typo3conf/ext/cookie_notice/Resources/Public/Styles/CookieNotice.css?1665669388 — 200 — 1.1 KiB — 149 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/magnific-popup.css?1774276263www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/magnific-popup.css?1774276263 — 200 — 2.4 KiB — 147 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/pikaday.min.css?1774276263www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/pikaday.min.css?1774276263 — 200 — 1.7 KiB — 160 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/Style.min.css?1774276392www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/Style.min.css?1774276392 — 200 — 25.7 KiB — 217 ms — h2https://www.tue.nl/typo3conf/ext/tue_menu/Resources/Public/CSS/TueMenu.min.css?1774276365www.tue.nl/typo3conf/ext/tue_menu/R... https://www.tue.nl/typo3conf/ext/tue_menu/Resources/Public/CSS/TueMenu.min.css?1774276365 — 200 — 5.9 KiB — 641 ms — h2https://www.tue.nl/typo3conf/ext/tue_styling/Resources/Public/CSS/TueStyling.min.css?1774276391www.tue.nl/typo3conf/ext/tue_stylin... https://www.tue.nl/typo3conf/ext/tue_styling/Resources/Public/CSS/TueStyling.min.css?1774276391 — 200 — 31.6 KiB — 231 ms — h2https://cse.google.com/cse.js?cx=000827956107162310916:9hfn0dhtcpucse.google.com/cse.js?cx=0008279561... https://cse.google.com/cse.js?cx=000827956107162310916:9hfn0dhtcpu — 200 — 3.7 KiB — 108 ms — h2https://www.tue.nl/typo3temp/assets/js/dfc25987ec0b988c9a083b0fbe99c4ee.js?1776402803www.tue.nl/typo3temp/assets/js/dfc2... https://www.tue.nl/typo3temp/assets/js/dfc25987ec0b988c9a083b0fbe99c4ee.js?1776402803 — 200 — 528 B — 167 ms — h2https://www.tue.nl/typo3conf/ext/cookie_notice/Resources/Public/JavaScripts/CookieNotice.js?1665669388www.tue.nl/typo3conf/ext/cookie_not... https://www.tue.nl/typo3conf/ext/cookie_notice/Resources/Public/JavaScripts/CookieNotice.js?1665669388 — 200 — 6.5 KiB — 168 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/jquery-1_11_2.js?1774276394www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/jquery-1_11_2.js?1774276394 — 200 — 34.2 KiB — 226 ms — h2https://www.tue.nl/typo3conf/ext/ufe_donations/Resources/Public/JavaScript/donationForm.js?1774276302www.tue.nl/typo3conf/ext/ufe_donati... https://www.tue.nl/typo3conf/ext/ufe_donations/Resources/Public/JavaScript/donationForm.js?1774276302 — 200 — 3.3 KiB — 202 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/Foundation/foundation.js?1774276394www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/Foundation/foundation.js?1774276394 — 200 — 3.2 KiB — 174 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/pikaday.js?1774276394www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/pikaday.js?1774276394 — 200 — 6.2 KiB — 178 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/parseDate.js?1774276394www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/parseDate.js?1774276394 — 200 — 672 B — 172 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/dateFormat.js?1774276394www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/dateFormat.js?1774276394 — 200 — 759 B — 192 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/formDatePicker.js?1774276394www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/formDatePicker.js?1774276394 — 200 — 758 B — 170 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/modernizr.min.js?1774276302www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/modernizr.min.js?1774276302 — 200 — 1.9 KiB — 187 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/jquery.main.js?1774276394www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/jquery.main.js?1774276394 — 200 — 1.5 KiB — 178 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/magnific-popup.min.js?1774276302www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/magnific-popup.min.js?1774276302 — 200 — 8.0 KiB — 638 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/magnific-popup-initializer.js?1774276394www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/magnific-popup-initializer.js?1774276394 — 200 — 2.0 KiB — 205 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/stacktable.min.js?1774276302www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/stacktable.min.js?1774276302 — 200 — 1.7 KiB — 640 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/CreatePrintImages.js?1774276394www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/CreatePrintImages.js?1774276394 — 200 — 995 B — 174 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/MediaQueryChange.js?1774276394www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/MediaQueryChange.js?1774276394 — 200 — 983 B — 197 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/InitFoundation.js?1774276394www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/JavaScript/InitFoundation.js?1774276394 — 200 — 642 B — 191 ms — h2https://www.tue.nl/typo3conf/ext/tue_menu/Resources/Public/JavaScript/Vendor/svg4everybody.min.js?1774276302www.tue.nl/typo3conf/ext/tue_menu/R... https://www.tue.nl/typo3conf/ext/tue_menu/Resources/Public/JavaScript/Vendor/svg4everybody.min.js?1774276302 — 200 — 1.4 KiB — 186 ms — h2https://www.tue.nl/typo3conf/ext/tue_menu/Resources/Public/JavaScript/init.js?1774276394www.tue.nl/typo3conf/ext/tue_menu/R... https://www.tue.nl/typo3conf/ext/tue_menu/Resources/Public/JavaScript/init.js?1774276394 — 200 — 623 B — 192 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 FCP 8.2 s LCP 14.3 shttps://tue.nl// https://tue.nl/ — 301 — 110 B — 111 ms — http/1.1https://www.tue.nl/www.tue.nl/ https://www.tue.nl/ — 301 — 604 B — 70 ms — h2https://www.tue.nl/en/www.tue.nl/en/ https://www.tue.nl/en/ — 200 — 9.2 KiB — 55 ms — h2https://www.tue.nl/typo3temp/assets/css/7015c8c4ac5ff815b57530b221005fc6.css?1776402803www.tue.nl/typo3temp/assets/css/701... https://www.tue.nl/typo3temp/assets/css/7015c8c4ac5ff815b57530b221005fc6.css?1776402803 — 200 — 1.4 KiB — 146 ms — h2https://www.tue.nl/typo3conf/ext/cookie_notice/Resources/Public/Styles/CookieNotice.css?1665669388www.tue.nl/typo3conf/ext/cookie_not... https://www.tue.nl/typo3conf/ext/cookie_notice/Resources/Public/Styles/CookieNotice.css?1665669388 — 200 — 1.1 KiB — 149 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/magnific-popup.css?1774276263www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/magnific-popup.css?1774276263 — 200 — 2.4 KiB — 147 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/pikaday.min.css?1774276263www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/pikaday.min.css?1774276263 — 200 — 1.7 KiB — 160 ms — h2https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/Style.min.css?1774276392www.tue.nl/typo3conf/ext/www_tue_nl... https://www.tue.nl/typo3conf/ext/www_tue_nl/Resources/Public/CSS/Style.min.css?1774276392 — 200 — 25.7 KiB — 217 ms — h2https://www.tue.nl/typo3conf/ext/tue_menu/Resources/Public/CSS/TueMenu.min.css?1774276365www.tue.nl/typo3conf/ext/tue_menu/R... https://www.tue.nl/typo3conf/ext/tue_menu/Resources/Public/CSS/TueMenu.min.css?1774276365 — 200 — 5.9 KiB — 641 ms — 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h3https://consentcdn.cookiebot.com/consentconfig/98814da8-7f29-402a-aecd-dcff795567be/settings.jsonconsentcdn.cookiebot.com/consentcon... https://consentcdn.cookiebot.com/consentconfig/98814da8-7f29-402a-aecd-dcff795567be/settings.json — 200 — 937 B — 56 ms — h2https://consent.cookiebot.com/98814da8-7f29-402a-aecd-dcff795567be/cc.js?renew=false&referer=www.tue.nl&dnt=false&init=false&culture=enconsent.cookiebot.com/98814da8-7f29... https://consent.cookiebot.com/98814da8-7f29-402a-aecd-dcff795567be/cc.js?renew=false&referer=www.tue.nl&dnt=false&init=false&culture=en — 200 — 107.9 KiB — 96 ms — h2https://consentcdn.cookiebot.com/sdk/bc-v4.min.htmlconsentcdn.cookiebot.com/sdk/bc-v4.... https://consentcdn.cookiebot.com/sdk/bc-v4.min.html — 200 — 809 B — 54 ms — h2https://www.googletagmanager.com/gtag/destination?id=AW-940554233&cx=c&gtm=4e64h1h1www.googletagmanager.com/gtag/desti... https://www.googletagmanager.com/gtag/destination?id=AW-940554233&cx=c&gtm=4e64h1h1 — 200 — 134.1 KiB — 80 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-JN37M497TT&gtm=45je64h1h1v882889223z86692796za20gzb6692796zd6692796&_p=1776814495798&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&gdid=dMWZhNz&_eu=EAAAAGA&are=1&cid=887878759.1776814496&frm=0&gtm_up=1&ir=1&pscdl=denied&rcb=3&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115616986~115938465~115938469~117266400~117384405~117512542&sid=1776814496&sct=1&seg=0&dl=https%3A%2F%2Fwww.tue.nl%2Fen%2F&dt=Eindhoven%20University%20of%20Technology&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&up.TU%2Fe%20-%20Websites%20(Live)%20GA4=258297357&tfd=1330region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-JN37M497TT&gtm=45je64h1h1v882889223z86692796za20gzb6692796zd6692796&_p=1776814495798&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&gdid=dMWZhNz&_eu=EAAAAGA&are=1&cid=887878759.1776814496&frm=0&gtm_up=1&ir=1&pscdl=denied&rcb=3&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115616986~115938465~115938469~117266400~117384405~117512542&sid=1776814496&sct=1&seg=0&dl=https%3A%2F%2Fwww.tue.nl%2Fen%2F&dt=Eindhoven%20University%20of%20Technology&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&up.TU%2Fe%20-%20Websites%20(Live)%20GA4=258297357&tfd=1330 — 204 — 546 B — 140 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=3&frm=0&en=page_view&dl=https%3A%2F%2Fwww.tue.nl%2Fen%2F&scrsrc=www.googletagmanager.com&rnd=867056314.1776814496&navt=n&npa=1&us_privacy=1YNY&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45je64h1h1v882889223z86692796za20gzb6692796zd6692796xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938469~117266400~117384405~117512542&apve=1&apvf=f&apvc=0&tids=AW-833847406&tid=AW-833847406&tft=1776814496243&tfd=1343pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=3&frm=0&en=page_view&dl=https%3A%2F%2Fwww.tue.nl%2Fen%2F&scrsrc=www.googletagmanager.com&rnd=867056314.1776814496&navt=n&npa=1&us_privacy=1YNY&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45je64h1h1v882889223z86692796za20gzb6692796zd6692796xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938469~117266400~117384405~117512542&apve=1&apvf=f&apvc=0&tids=AW-833847406&tid=AW-833847406&tft=1776814496243&tfd=1343 — 200 — 21 B — 28 ms — h3https://px.ads.linkedin.com/wa/?medium=fetch&fmt=gpx.ads.linkedin.com/wa/?medium=fetc... https://px.ads.linkedin.com/wa/?medium=fetch&fmt=g — 204 — 716 B — 217 ms — h2https://px.ads.linkedin.com/attribution_trigger?pid=6746306&time=1776814496268&url=https%3A%2F%2Fwww.tue.nl%2Fen%2F&tm=gtmv2px.ads.linkedin.com/attribution_tri... https://px.ads.linkedin.com/attribution_trigger?pid=6746306&time=1776814496268&url=https%3A%2F%2Fwww.tue.nl%2Fen%2F&tm=gtmv2 — 200 — 1.0 KiB — 279 ms — h2https://px.ads.linkedin.com/collect?v=2&fmt=js&pid=6746306&time=1776814496268&url=https%3A%2F%2Fwww.tue.nl%2Fen%2F&tm=gtmv2px.ads.linkedin.com/collect?v=2&fmt... https://px.ads.linkedin.com/collect?v=2&fmt=js&pid=6746306&time=1776814496268&url=https%3A%2F%2Fwww.tue.nl%2Fen%2F&tm=gtmv2 — 302 — 944 B — 235 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&ae=g&dl=https%3A%2F%2Fwww.tue.nl%2Fen%2F&scrsrc=www.googletagmanager.com&rnd=867056314.1776814496&navt=n&npa=1&us_privacy=1---&ep.ads_data_redaction=1&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64h1h1z86692796za20gzb6692796zd6692796xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938468~117266401~118128923&apve=1&apvf=f&apvc=0&tids=AW-940554233&tid=AW-940554233&tft=1776814496315&tfd=1415pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&ae=g&dl=https%3A%2F%2Fwww.tue.nl%2Fen%2F&scrsrc=www.googletagmanager.com&rnd=867056314.1776814496&navt=n&npa=1&us_privacy=1---&ep.ads_data_redaction=1&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64h1h1z86692796za20gzb6692796zd6692796xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938468~117266401~118128923&apve=1&apvf=f&apvc=0&tids=AW-940554233&tid=AW-940554233&tft=1776814496315&tfd=1415 — 200 — 21 B — 58 ms — h3data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHAAAAAuCAYAAADwZJ3MAAAAAXNSR0IArs4c6QAAAARnQU1BAACxj…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHAAAAAuCAYAAADwZJ3MAAAAAXNSR0IArs4c6QAAAARnQU1BAACxj… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAASCAYAAABWzo5XAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAA…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAASCAYAAABWzo5XAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAA… — 200 — 0 B — 0 ms — datahttps://px4.ads.linkedin.com/collect?v=2&fmt=js&pid=6746306&time=1776814496268&url=https%3A%2F%2Fwww.tue.nl%2Fen%2F&tm=gtmv2&e_ipv6=AQLRMiE5IaKR3gAAAZ2yZZq6RN0VwBwBwKcxx1PHByktBwqXpjkhlOUr_djFtbDYFE-8i2b2nzIvpx4.ads.linkedin.com/collect?v=2&fm... https://px4.ads.linkedin.com/collect?v=2&fmt=js&pid=6746306&time=1776814496268&url=https%3A%2F%2Fwww.tue.nl%2Fen%2F&tm=gtmv2&e_ipv6=AQLRMiE5IaKR3gAAAZ2yZZq6RN0VwBwBwKcxx1PHByktBwqXpjkhlOUr_djFtbDYFE-8i2b2nzIv — 200 — 910 B — 288 ms — h2https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=afs&tv=1234567890&st=env&sjk=dCm6pxHVQNarDEla7TcjHQ==&sde=1ep1.adtrafficquality.google/getconf... https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=afs&tv=1234567890&st=env&sjk=dCm6pxHVQNarDEla7TcjHQ==&sde=1 — 200 — 8.1 KiB — 98 ms — h3https://www.tue.nl/favicon-64.icowww.tue.nl/favicon-64.ico https://www.tue.nl/favicon-64.ico — 200 — 20.6 KiB — 100 ms — h2https://ep2.adtrafficquality.google/sodar/sodar2.jsep2.adtrafficquality.google/sodar/s... https://ep2.adtrafficquality.google/sodar/sodar2.js — 200 — 7.9 KiB — 96 ms — h2https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.htmlep2.adtrafficquality.google/sodar/s... https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.html — 200 — 5.8 KiB — 70 ms — h2https://pagead2.googlesyndication.com/bg/dj12lhpBI2WR1GQ6n5lcmp69XlpHOiTAWO7c9b6NTo0.jspagead2.googlesyndication.com/bg/dj... https://pagead2.googlesyndication.com/bg/dj12lhpBI2WR1GQ6n5lcmp69XlpHOiTAWO7c9b6NTo0.js — 200 — 21.6 KiB — 80 ms — h3https://ep2.adtrafficquality.google/generate_204?RhEXNAep2.adtrafficquality.google/generat... https://ep2.adtrafficquality.google/generate_204?RhEXNA — 204 — 40 B — 24 ms — h2https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=afs_1234567890&jk=dCm6pxHVQNarDEla7TcjHQ%3D%3D&bg=!1Nel17XNAAY2C5OeFgs7AEcBe5WfOBtViAUJkEDaNLaBmFkGg7WBn_vPP-9oA6myqHjrilxYXOB0PjM2n80-XfRGkRi88-atTPVjNmCIco13GszQNJZckQIAAAA1UgAAAANoAQd-ABuoDeers3syservI03njqRVJMClY2Gv7I3LQYMKAI1wd-j5qwO0LC0w8Hg6Fd2160hPU1QrsYsQ-9laBYCVJc43qRKR6rD8OE4LHB0Dth-FpBi7pQdgfaSDCXWRfcYPyVWpLplvLvrQ4mV_dd9jC04QCDa1ua1QHabCp7P7D1qbWX21bSkeFUZ4Cb7HgVD-85lYalwo8ffa8w2VEsoplFvDncHl3LSg8nIs0UOZAgsdN09p1AeDbP1Fb49sJ5lsylpRvRjPu_N4AsNVd_Epsn3tmcI6da2BCZOIYFIMRA5Skm3p0ENyu3jH1CJ0kv_WlJfgRfX-LJRKogNzir-iyHlJaSkrc-Cf4cjN-9OUGHWe7zsuKTPVSzBaWbobcwulOwV3GyNEuO4o__Z-2Cn5OV_miGqSIT8DX0fX2U7BPPOVBdsjo_Bse5oNilJ4HPscTFAM2G-dt7n_pAm8-lblNJZMdSIPdoueQT5PfdfLp6CimUDx6c2zv1qCHdrTNfdOFCgzWJuSPoeJV4Vb92466L8xWCnjXZP0-pJEfzluowWTVT4QO7nM82a-C_8ZzRxbRXQid3afJeEoRobDVCt28WI_qXvovT-A2wC_WoE5zPxVmHexZuiDvuQsRMaqgw8EhP8_vFMHZ6cTrPWWiuopu9hDjiv7eHreptmvyIDwenLiuK2xVz7UU8X5MUkhN3i1JbLJzGwYJVQJ4DATTyGocr8hSxPVTiOROtZmM8GAi7HdmnQY7ES1WuoRuavYn1qwXT0q2bEQbjs8tOURp092cuq9BATDs5owFiLkSqtrRdWkDYPIhzD1S9wfp2xf_Tq4eK5eXf9TGOEx3tnOOo8Hv0J16rRDGhyGaH1LHZqDviUFpXURfEIyCj4tOw5HLAbXs7ikTdRX0HzEUPIRLyDdK9lQYiRKfWY03t4fep1.adtrafficquality.google/pagead/... https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=afs_1234567890&jk=dCm6pxHVQNarDEla7TcjHQ%3D%3D&bg=!1Nel17XNAAY2C5OeFgs7AEcBe5WfOBtViAUJkEDaNLaBmFkGg7WBn_vPP-9oA6myqHjrilxYXOB0PjM2n80-XfRGkRi88-atTPVjNmCIco13GszQNJZckQIAAAA1UgAAAANoAQd-ABuoDeers3syservI03njqRVJMClY2Gv7I3LQYMKAI1wd-j5qwO0LC0w8Hg6Fd2160hPU1QrsYsQ-9laBYCVJc43qRKR6rD8OE4LHB0Dth-FpBi7pQdgfaSDCXWRfcYPyVWpLplvLvrQ4mV_dd9jC04QCDa1ua1QHabCp7P7D1qbWX21bSkeFUZ4Cb7HgVD-85lYalwo8ffa8w2VEsoplFvDncHl3LSg8nIs0UOZAgsdN09p1AeDbP1Fb49sJ5lsylpRvRjPu_N4AsNVd_Epsn3tmcI6da2BCZOIYFIMRA5Skm3p0ENyu3jH1CJ0kv_WlJfgRfX-LJRKogNzir-iyHlJaSkrc-Cf4cjN-9OUGHWe7zsuKTPVSzBaWbobcwulOwV3GyNEuO4o__Z-2Cn5OV_miGqSIT8DX0fX2U7BPPOVBdsjo_Bse5oNilJ4HPscTFAM2G-dt7n_pAm8-lblNJZMdSIPdoueQT5PfdfLp6CimUDx6c2zv1qCHdrTNfdOFCgzWJuSPoeJV4Vb92466L8xWCnjXZP0-pJEfzluowWTVT4QO7nM82a-C_8ZzRxbRXQid3afJeEoRobDVCt28WI_qXvovT-A2wC_WoE5zPxVmHexZuiDvuQsRMaqgw8EhP8_vFMHZ6cTrPWWiuopu9hDjiv7eHreptmvyIDwenLiuK2xVz7UU8X5MUkhN3i1JbLJzGwYJVQJ4DATTyGocr8hSxPVTiOROtZmM8GAi7HdmnQY7ES1WuoRuavYn1qwXT0q2bEQbjs8tOURp092cuq9BATDs5owFiLkSqtrRdWkDYPIhzD1S9wfp2xf_Tq4eK5eXf9TGOEx3tnOOo8Hv0J16rRDGhyGaH1LHZqDviUFpXURfEIyCj4tOw5HLAbXs7ikTdRX0HzEUPIRLyDdK9lQYiRKfWY03t4f — 204 — 17 B — 47 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1948ms · 617KB · €21/mo
Google Tag Manager
Tag Manager
Costly
Execution 335ms
Transfer 177 KB
Unused 35%
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 332ms
Transfer 0 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 329ms
Transfer 175 KB
Unused 35%
Monthly Cost €4/mo
consent.cookiebot.com
Other
Costly
Execution 313ms
Transfer 36 KB
Unused 64%
Monthly Cost €3/mo
cse.google.com
Other
Optional
Execution 178ms
Transfer 4 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 128ms
Transfer 134 KB
Unused 51%
Monthly Cost €1/mo
www.tue.nl
Other
Optional
Execution 102ms
Transfer 34 KB
Monthly Cost €1/mo
www.tue.nl
Other
Optional
Execution 99ms
Transfer 9 KB
Monthly Cost €1/mo
cse.google.com
Other
Optional
Execution 79ms
Transfer 44 KB
Unused 73%
Monthly Cost €1/mo
www.tue.nl
Other
Optional
Execution 53ms
Transfer 3 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 335ms and costs ~€4/month
  • Unattributable adds 332ms and costs ~€4/month
  • Google Tag Manager adds 329ms and costs ~€4/month
  • consent.cookiebot.com adds 313ms and costs ~€3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Google Tag Manager takes 335ms 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 332ms 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 329ms 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

consent.cookiebot.com takes 313ms 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 consent.cookiebot.com'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

51% of Google Tag Manager'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

73% of cse.google.com'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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