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https://kuleuven.be

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

38
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.
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.

6.67 s

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

6.87 s

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

910 ms

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

0.014

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

8.02 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

15.10 s

Page Load Progression

538 ms
1.1 s
1.6 s
2.2 s
2.7 s
3.2 s
3.8 s
4.3 s
Checks
15
6 PASS 3 REVIEW 4 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 (2.0 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3093ms total JS execution
FIX
3093ms total JS execution
Warning::
https://www.kuleuven.be/kuleuven/: 614ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-K6Q...: 556ms CPU time
Warning::
Unattributable: 459ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-825...: 319ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202508.2...: 309ms CPU time
Warning::
Third-party scripts: 3093ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 20% Style & Layout 13% Script Parsing & Compilation 13% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.kuleuven.be/kuleuven/614ms11ms7ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K6Q2R6556ms491ms55ms3rd
Unattributable459ms15ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-8256385&cx=c&gtm=4e64h1319ms248ms57ms3rd
https://cdn.cookielaw.org/scripttemplates/202508.2.0/otBannerSdk.js309ms174ms57ms3rd
https://www.kuleuven.be/++webresource++74456754-c4ae-5e78-b089-c480f83eb0c7/++plone++static/bundle-plone/bundle.min.js223ms140ms68ms3rd
https://connect.facebook.net/en_US/fbevents.js186ms153ms30ms3rd
https://connect.facebook.net/signals/config/975733057666998?v=2.9.303&r=stable&domain=www.kuleuven.be&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168178ms133ms43ms3rd
https://www.kuleuven.be/++webresource++63cfd711-b569-56e9-9ddd-422f58e3d9c3/++plone++facetednavigation/faceted-jquery.min.js156ms87ms55ms3rd
https://www.kuleuven.be/++webresource++74456754-c4ae-5e78-b089-c480f83eb0c7/++plone++static/bundle-plone/chunks/74824.2ecb1f1128e89d59c105.min.js92ms76ms11ms3rd
D
JS Bundles
Action
22 scripts, 476 KB unused
FIX
22 scripts, 476 KB unused
Warning::
https://www.kuleuven.be/++webresource++63cfd711-b5...: 121 KB unused (91%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202508.2...: 65 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-825...: 64 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-K6Q...: 63 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.kuleuven.be/++webresource++74456754-c4...: 54 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 476 KB
476 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.kuleuven.be/++webresource++63cfd711-b569-56e9-9ddd-422f58e3d9c3/++plone++facetednavigation/faceted-jquery.min.js135 KB121 KB (91%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202508.2.0/otBannerSdk.js121 KB65 KB (54%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-8256385&cx=c&gtm=4e64h1129 KB64 KB (49%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K6Q2R6170 KB63 KB (37%)✓3rd
https://www.kuleuven.be/++webresource++74456754-c4ae-5e78-b089-c480f83eb0c7/++plone++static/bundle-plone/chunks/7111.a3447b08fb3eb2816b11.min.js66 KB54 KB (82%)✓3rd
https://www.kuleuven.be/++webresource++74456754-c4ae-5e78-b089-c480f83eb0c7/++plone++static/bundle-plone/bundle.min.js109 KB48 KB (45%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB34 KB (35%)✓3rd
https://www.kuleuven.be/++webresource++74456754-c4ae-5e78-b089-c480f83eb0c7/++plone++static/bundle-plone/chunks/74824.2ecb1f1128e89d59c105.min.js28 KB27 KB (100%)✓3rd
https://www.kuleuven.be/++webresource++09e0b31e-300a-599a-a589-ae4f34b73627/++plone++facetednavigation/faceted-view.min.js17 KB—✓3rd
https://www.kuleuven.be/++webresource++74456754-c4ae-5e78-b089-c480f83eb0c7/++plone++static/bundle-plone/chunks/4523.1b73ffa926017e285b9d.min.js8 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
60 resources · 2.0 MB · 476 KB savings available
FIX
60 resources · 2.0 MB · 476 KB savings available
Warning::
Page weight 1.0 MB over 1MB target
Got: 2.0 MB Expected: ≤ 1 MB
Info::
~476 KB of savings available
Warning::
59 third-party resources (100% of weight)
Info::
1 resources over 200KB
60 resources · 2.0 MiB · 59 third-party 1.0 MiB over 1MB target
JavaScript 47% · 981.7 KiB
Image 35% · 734.5 KiB
Font 9% · 189.2 KiB
CSS 6% · 116.9 KiB
Other 3% · 53.0 KiB
Document 1% · 10.9 KiB

~475.8 KiB of savings available

Remove unused JavaScript: 475.8 KiB
C
Page Weight Budget
Action
2.0 MB transferred, 60 requests
REVIEW
2.0 MB transferred, 60 requests
Info::
Page weighs 5.0 MB (2.0 MB transferred)
Warning::
JavaScript is 982 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 982 KB
Info::
60 HTTP requests
Info::
Estimated 0.43 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
60 requests
0.43 g CO2 per page load
JavaScript 981.7 KiB 47%
Images 730.9 KiB 35%
Fonts 189.2 KiB 9%
CSS 112.4 KiB 5%
Other 46.6 KiB 2%
Other 10.7 KiB 1%
HTML 10.4 KiB 0%
Other 4.3 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

B
Image Optimization
8 images, 0 KB saveable
REVIEW
8 images, 0 KB saveable
Warning::
https://stijl.kuleuven.be/releases/latest/img/svg/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
8 images 731 KB
0 oversized -0 KB
8 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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
5 fonts (189 KB)
PASS
5 fonts (189 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

189 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 6.7 s LCP 6.9 shttps://fonts.gstatic.com/s/sourceserifpro/v18/neIQzD-0qpwxpaWvjeD0X88SAOeauXQ-oAGIyY0.woff2neIQzD-0qpwxpaWvjeD0X88... https://fonts.gstatic.com/s/sourceserifpro/v18/neIQzD-0qpwxpaWvjeD0X88SAOeauXQ-oAGIyY0.woff2 — 20.0 KiB — 6 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 10 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff2 — 14.6 KiB — 18 ms — font-display: swaphttps://fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2flUhRq6tzZclQEJ-Vdg-Iui... https://fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2 — 125.6 KiB — 21 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 14.4 KiB — 15 ms — font-display: swap
neIQzD-0qpwxpaWvjeD0X88... woff2 swap
Size 20 KB
Load time 6 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 10 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 18 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
flUhRq6tzZclQEJ-Vdg-Iui... woff2 swap
Size 126 KB
Load time 21 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 15 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)

Fixing the unchecked items could save ~63 KB and ~126 ms

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
HTTP Caching
max-age=120 (2 minutes)
PASS
max-age=120 (2 minutes)
Info::
Cache-Control header is set
Got: max-age=120, proxy-revalidate, private
Info::
Effective TTL: 2 minutes (max-age=120)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=120, proxy-revalidate, private

DirectiveValueMeaning
max-age120Cache for 2 minutes
proxy-revalidate—
private—Only browser cache, not CDN/proxy
Effective TTL: 120 seconds
Network Waterfall
60 requests over 3972ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 6.7 s LCP 6.9 shttps://kuleuven.be// https://kuleuven.be/ — 301 — 196 B — 705 ms — http/1.1https://www.kuleuven.be/www.kuleuven.be/ https://www.kuleuven.be/ — 301 — 538 B — 571 ms — http/1.1https://www.kuleuven.be/kuleuven/www.kuleuven.be/kuleuven/ https://www.kuleuven.be/kuleuven/ — 200 — 10.4 KiB — 148 ms — http/1.1https://cdn.cookielaw.org/consent/a8db6e5f-20c8-46f0-86d7-2835a0229013/OtAutoBlock.jscdn.cookielaw.org/consent/a8db6e5f-... https://cdn.cookielaw.org/consent/a8db6e5f-20c8-46f0-86d7-2835a0229013/OtAutoBlock.js — 200 — 2.5 KiB — 52 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 44 ms — h2https://www.kuleuven.be/++webresource++d8447c31-cb62-5e50-b3f2-90af0e386241/++resource++quickupload_static/uploadify.csswww.kuleuven.be/++webresource++d844... https://www.kuleuven.be/++webresource++d8447c31-cb62-5e50-b3f2-90af0e386241/++resource++quickupload_static/uploadify.css — 200 — 2.0 KiB — 151 ms — http/1.1https://www.kuleuven.be/++webresource++87d24f12-da88-5fca-8657-21c181543c6b/++resource++quickupload_static/fileuploader.csswww.kuleuven.be/++webresource++87d2... https://www.kuleuven.be/++webresource++87d24f12-da88-5fca-8657-21c181543c6b/++resource++quickupload_static/fileuploader.css — 200 — 1.7 KiB — 300 ms — http/1.1https://www.kuleuven.be/++webresource++b6e63fde-4269-5984-a67a-480840700e9a/++resource++easyform.csswww.kuleuven.be/++webresource++b6e6... https://www.kuleuven.be/++webresource++b6e63fde-4269-5984-a67a-480840700e9a/++resource++easyform.css — 200 — 1.1 KiB — 446 ms — http/1.1https://www.kuleuven.be/++webresource++d5804eac-48ee-5c69-8389-75ac65829cb3/++plone++facetednavigation/faceted-jquery.min.csswww.kuleuven.be/++webresource++d580... https://www.kuleuven.be/++webresource++d5804eac-48ee-5c69-8389-75ac65829cb3/++plone++facetednavigation/faceted-jquery.min.css — 200 — 15.7 KiB — 579 ms — http/1.1https://www.kuleuven.be/++webresource++96c3556c-9d70-5d58-951a-ff5109db53b8/++plone++facetednavigation/faceted-view.min.csswww.kuleuven.be/++webresource++96c3... https://www.kuleuven.be/++webresource++96c3556c-9d70-5d58-951a-ff5109db53b8/++plone++facetednavigation/faceted-view.min.css — 200 — 2.5 KiB — 585 ms — http/1.1https://www.kuleuven.be/++webresource++688bdb99-253c-5b8b-bd8b-90f9b92d6ab0/++plone++facetednavigation/faceted-edit.min.csswww.kuleuven.be/++webresource++688b... https://www.kuleuven.be/++webresource++688bdb99-253c-5b8b-bd8b-90f9b92d6ab0/++plone++facetednavigation/faceted-edit.min.css — 200 — 2.2 KiB — 586 ms — http/1.1https://fonts.googleapis.com/css2?family=Material+Icons&family=Source+Sans+Pro:ital,wght@0,400;0,600;0,700;1,400;1,600;1,700&family=Source+Serif+Pro:ital,wght@0,400;0,600;0,700;1,400;1,600;1,700&display=swapfonts.googleapis.com/css2?family=Ma... https://fonts.googleapis.com/css2?family=Material+Icons&family=Source+Sans+Pro:ital,wght@0,400;0,600;0,700;1,400;1,600;1,700&family=Source+Serif+Pro:ital,wght@0,400;0,600;0,700;1,400;1,600;1,700&display=swap — 200 — 2.0 KiB — 80 ms — h2https://www.kuleuven.be/++webresource++8b0aff1f-678f-5b2f-9281-18c72aeca304/++plone++kuleuven.staff/staff.csswww.kuleuven.be/++webresource++8b0a... https://www.kuleuven.be/++webresource++8b0aff1f-678f-5b2f-9281-18c72aeca304/++plone++kuleuven.staff/staff.css — 200 — 2.0 KiB — 594 ms — http/1.1https://www.kuleuven.be/++webresource++810d3812-c90d-5229-bae6-c1524189a73d/++theme++ku-leuven-theme/styles/theme.min.csswww.kuleuven.be/++webresource++810d... 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h3https://cdn.cookielaw.org/scripttemplates/202508.2.0/assets/otCenterRounded.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202508.2.0/assets/otCenterRounded.json — 200 — 2.8 KiB — 37 ms — h2https://cdn.cookielaw.org/scripttemplates/202508.2.0/assets/otPcCenter.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202508.2.0/assets/otPcCenter.json — 200 — 15.0 KiB — 33 ms — h2https://cdn.cookielaw.org/scripttemplates/202508.2.0/assets/otCommonStyles.csscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202508.2.0/assets/otCommonStyles.css — 200 — 4.5 KiB — 23 ms — h2https://www.kuleuven.be/plonejsi18n?domain=widgets&language=nlwww.kuleuven.be/plonejsi18n?domain=... https://www.kuleuven.be/plonejsi18n?domain=widgets&language=nl — 200 — 8.2 KiB — 154 ms — http/1.1https://cdn.cookielaw.org/logos/830e2552-53d9-4d73-abd1-47ef1b4dcd83/24fcc2ab-887e-41d8-845e-636895f0ef90/39560ac7-d4e0-4a77-ad9e-1cab3ecb4669/logo.pngcdn.cookielaw.org/logos/830e2552-53... https://cdn.cookielaw.org/logos/830e2552-53d9-4d73-abd1-47ef1b4dcd83/24fcc2ab-887e-41d8-845e-636895f0ef90/39560ac7-d4e0-4a77-ad9e-1cab3ecb4669/logo.png — 200 — 878 B — 21 ms — h2https://cdn.cookielaw.org/logos/static/powered_by_logo.svgcdn.cookielaw.org/logos/static/powe... https://cdn.cookielaw.org/logos/static/powered_by_logo.svg — 200 — 2.6 KiB — 17 ms — 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https://connect.facebook.net/signals/config/975733057666998?v=2.9.303&r=stable&domain=www.kuleuven.be&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 — 200 — 44.4 KiB — 91 ms — h3https://www.facebook.com/tr/?id=975733057666998&ev=PageView&dl=https%3A%2F%2Fwww.kuleuven.be%2Fkuleuven%2F&rl=&if=false&ts=1776809751670&sw=412&sh=823&v=2.9.303&r=stable&a=tmSimo-GTM-WebTemplate&ec=0&o=12318&fbp=fb.1.1776809751659.9520975356432924&ler=empty&cdl=API_unavailable&pmd[title]=KU%20Leuven&pmd[locale]=nl&pmd[description]=KU%20Leuven%20is%20een%20internationale%20community%20waar%20innovatief%20onderzoek%20aan%20de%20basis%20ligt%20van%20alle%20opleidingen.%20Gedreven%20onderzoekers%20en%20nieuwsgierige%20studenten%20doen%20voortdurend%20nieuwe%20inzichten%20op%20en%20zetten%20hun%20kennis%20in%20om%20de%20uitdagingen%20van%20onze%20tijd%20aan%20te%20pakken.&plt=2961.100000023842&it=1776809751526&coo=false&tm=1&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&exp=s0&expv2[0]=pl1&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im1&expv2[6]=hf0&rqm=GETwww.facebook.com/tr/?id=97573305766... https://www.facebook.com/tr/?id=975733057666998&ev=PageView&dl=https%3A%2F%2Fwww.kuleuven.be%2Fkuleuven%2F&rl=&if=false&ts=1776809751670&sw=412&sh=823&v=2.9.303&r=stable&a=tmSimo-GTM-WebTemplate&ec=0&o=12318&fbp=fb.1.1776809751659.9520975356432924&ler=empty&cdl=API_unavailable&pmd[title]=KU%20Leuven&pmd[locale]=nl&pmd[description]=KU%20Leuven%20is%20een%20internationale%20community%20waar%20innovatief%20onderzoek%20aan%20de%20basis%20ligt%20van%20alle%20opleidingen.%20Gedreven%20onderzoekers%20en%20nieuwsgierige%20studenten%20doen%20voortdurend%20nieuwe%20inzichten%20op%20en%20zetten%20hun%20kennis%20in%20om%20de%20uitdagingen%20van%20onze%20tijd%20aan%20te%20pakken.&plt=2961.100000023842&it=1776809751526&coo=false&tm=1&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&exp=s0&expv2[0]=pl1&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im1&expv2[6]=hf0&rqm=GET — 200 — 19 B — 42 ms — h3https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=975733057666998&ev=PageView&dl=https%3A%2F%2Fwww.kuleuven.be%2Fkuleuven%2F&rl=&if=false&ts=1776809751670&sw=412&sh=823&v=2.9.303&r=stable&a=tmSimo-GTM-WebTemplate&ec=0&o=12318&fbp=fb.1.1776809751659.9520975356432924&ler=empty&cdl=API_unavailable&pmd[title]=KU%20Leuven&pmd[locale]=nl&pmd[description]=KU%20Leuven%20is%20een%20internationale%20community%20waar%20innovatief%20onderzoek%20aan%20de%20basis%20ligt%20van%20alle%20opleidingen.%20Gedreven%20onderzoekers%20en%20nieuwsgierige%20studenten%20doen%20voortdurend%20nieuwe%20inzichten%20op%20en%20zetten%20hun%20kennis%20in%20om%20de%20uitdagingen%20van%20onze%20tijd%20aan%20te%20pakken.&plt=2961.100000023842&it=1776809751526&coo=false&tm=1&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&exp=s0&expv2[0]=pl1&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im1&expv2[6]=hf0&rqm=FGETwww.facebook.com/privacy_sandbox/pi... https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=975733057666998&ev=PageView&dl=https%3A%2F%2Fwww.kuleuven.be%2Fkuleuven%2F&rl=&if=false&ts=1776809751670&sw=412&sh=823&v=2.9.303&r=stable&a=tmSimo-GTM-WebTemplate&ec=0&o=12318&fbp=fb.1.1776809751659.9520975356432924&ler=empty&cdl=API_unavailable&pmd[title]=KU%20Leuven&pmd[locale]=nl&pmd[description]=KU%20Leuven%20is%20een%20internationale%20community%20waar%20innovatief%20onderzoek%20aan%20de%20basis%20ligt%20van%20alle%20opleidingen.%20Gedreven%20onderzoekers%20en%20nieuwsgierige%20studenten%20doen%20voortdurend%20nieuwe%20inzichten%20op%20en%20zetten%20hun%20kennis%20in%20om%20de%20uitdagingen%20van%20onze%20tijd%20aan%20te%20pakken.&plt=2961.100000023842&it=1776809751526&coo=false&tm=1&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&exp=s0&expv2[0]=pl1&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im1&expv2[6]=hf0&rqm=FGET — 200 — 196 B — 140 ms — h3https://stijl.kuleuven.be/releases/latest/img/favicon.pngstijl.kuleuven.be/releases/latest/i... https://stijl.kuleuven.be/releases/latest/img/favicon.png — 200 — 3.5 KiB — 142 ms — http/1.1https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.kuleuven.be%2Fkuleuven%2F&scrsrc=www.googletagmanager.com&rnd=2024074671.1776809752&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dYWJhMj&gtm=45He64h1v72398690za200zd72398690xea&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115938465~115938468~117266400&apve=1&apvf=f&apvc=1&tft=1776809751979&tfd=3864pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.kuleuven.be%2Fkuleuven%2F&scrsrc=www.googletagmanager.com&rnd=2024074671.1776809752&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dYWJhMj&gtm=45He64h1v72398690za200zd72398690xea&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115938465~115938468~117266400&apve=1&apvf=f&apvc=1&tft=1776809751979&tfd=3864 — 200 — 21 B — 47 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=18&frm=0&en=page_view&dl=https%3A%2F%2Fwww.kuleuven.be%2Fkuleuven%2F&scrsrc=www.googletagmanager.com&rnd=2024074671.1776809752&navt=n&npa=1&gdid=dYWJhMj&gtm=45fe64h1v9190936620z872398690za20gzb72398690zd72398690xec&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115616985~115938465~115938469~117266400&apve=1&apvf=f&apvc=0&tids=DC-8256385&tid=DC-8256385&tft=1776809751980&tfd=3866pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=18&frm=0&en=page_view&dl=https%3A%2F%2Fwww.kuleuven.be%2Fkuleuven%2F&scrsrc=www.googletagmanager.com&rnd=2024074671.1776809752&navt=n&npa=1&gdid=dYWJhMj&gtm=45fe64h1v9190936620z872398690za20gzb72398690zd72398690xec&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115616985~115938465~115938469~117266400&apve=1&apvf=f&apvc=0&tids=DC-8256385&tid=DC-8256385&tft=1776809751980&tfd=3866 — 200 — 21 B — 48 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 3093ms · 843KB · €34/mo
www.kuleuven.be
Other
Costly
Execution 614ms
Transfer 10 KB
Monthly Cost €7/mo
Google Tag Manager
Tag Manager
Costly
Execution 556ms
Transfer 170 KB
Unused 37%
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 459ms
Transfer 0 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 319ms
Transfer 129 KB
Unused 49%
Monthly Cost €3/mo
OneTrust
Consent
Essential
Execution 309ms
Transfer 121 KB
Unused 54%
Monthly Cost €3/mo
www.kuleuven.be
Other
Costly
Execution 223ms
Transfer 109 KB
Unused 45%
Monthly Cost €2/mo
Facebook Pixel
Advertising
Optional
Execution 186ms
Transfer 97 KB
Unused 35%
Monthly Cost €2/mo
Facebook Pixel
Advertising
Optional
Execution 178ms
Transfer 44 KB
Monthly Cost €2/mo
www.kuleuven.be
Other
Optional
Execution 156ms
Transfer 135 KB
Unused 91%
Monthly Cost €2/mo
www.kuleuven.be
Other
Optional
Execution 92ms
Transfer 28 KB
Unused 100%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.kuleuven.be adds 614ms and costs ~€7/month
  • Google Tag Manager adds 556ms and costs ~€6/month
  • Unattributable adds 459ms and costs ~€5/month
  • Google Tag Manager adds 319ms and costs ~€3/month
  • www.kuleuven.be adds 223ms 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.kuleuven.be takes 614ms 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 556ms 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 459ms 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 319ms 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

54% of OneTrust'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

www.kuleuven.be takes 223ms 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

91% of www.kuleuven.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

100% of www.kuleuven.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

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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