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https://ugent.be

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
64
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

4.06 s

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

16.63 s

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

113 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.

4.06 s

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

16.65 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 3 REVIEW 5 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 52 requests
FIX
2.5 MB transferred, 52 requests
Warning::
Page weighs 3.4 MB (2.5 MB transferred)
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Info::
Fonts are 370 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 370 KB
Info::
52 HTTP requests
Info::
Estimated 0.53 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
52 requests
0.53 g CO2 per page load
JavaScript 1.7 MiB 67%
Fonts 369.6 KiB 14%
Images 299.5 KiB 11%
CSS 74.4 KiB 3%
Other 61.9 KiB 2%
Other 34.0 KiB 1%
HTML 8.0 KiB 0%
Other 676 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over 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

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

Why this matters

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

Source: web.dev font loading

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 (2.5 MiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
26 scripts, 1.2 MB unused
FIX
26 scripts, 1.2 MB unused
Warning::
https://www.ugent.be/++webresource++63cfd711-b569-...: 414 KB unused (91%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ugent.be/++theme++ugent/static/js/vend...: 222 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ugent.be/++webresource++376a8ea8-4a93-...: 167 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ugent.be/++webresource++376a8ea8-4a93-...: 111 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ugent.be/++webresource++376a8ea8-4a93-...: 100 KB unused (94%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.2 MB
1263 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ugent.be/++webresource++63cfd711-b569-56e9-9ddd-422f58e3d9c3/++plone++facetednavigation/faceted-jquery.min.js459 KB414 KB (91%)✓3rd
https://www.ugent.be/++theme++ugent/static/js/vendor/jquery-ui.min.js249 KB222 KB (89%)✓3rd
https://www.ugent.be/++webresource++376a8ea8-4a93-5a30-b955-185ed5d3c57d/++plone++customstatic/bundle/chunks/39245.ebb195717fb30b2b8acf.min.js207 KB167 KB (81%)✓3rd
https://www.ugent.be/++webresource++376a8ea8-4a93-5a30-b955-185ed5d3c57d/++plone++customstatic/bundle/bundle.min.js265 KB111 KB (42%)✓3rd
https://www.ugent.be/++webresource++376a8ea8-4a93-5a30-b955-185ed5d3c57d/++plone++customstatic/bundle/chunks/37210.b4509cc5b4b0442d2d88.min.js106 KB100 KB (94%)✓3rd
https://www.ugent.be/++webresource++09e0b31e-300a-599a-a589-ae4f34b73627/++plone++facetednavigation/faceted-view.min.js76 KB69 KB (90%)✓3rd
https://www.ugent.be/++theme++ugent/static/js/vendor.min.js80 KB66 KB (82%)✓3rd
https://www.ugent.be/++theme++ugent/static/js/vendor/bootstrap-select.min.js53 KB44 KB (85%)✓3rd
https://www.ugent.be/++webresource++9ff7b2fc-bb60-5b7e-a094-49a1fe46d833/++plone++facetednavigation/faceted-edit.min.js48 KB41 KB (86%)✓3rd
https://ugent.containers.piwik.pro/e1b032d5-e42b-42b5-8b73-ea4347239c3d.js75 KB29 KB (39%)✓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
52 resources · 2.5 MB · 1.2 MB savings available
FIX
52 resources · 2.5 MB · 1.2 MB savings available
Warning::
Page weight 1.5 MB over 1MB target
Got: 2.5 MB Expected: ≤ 1 MB
Info::
~1.2 MB of savings available
Warning::
51 third-party resources (100% of weight)
Info::
4 resources over 200KB
52 resources · 2.5 MiB · 51 third-party 1.5 MiB over 1MB target
JavaScript 67% · 1.7 MiB
Font 14% · 369.6 KiB
Image 13% · 333.4 KiB
CSS 3% · 74.4 KiB
Other 2% · 62.6 KiB
Document 0% · 8.1 KiB

~1.2 MiB of savings available

Remove unused JavaScript: 1.2 MiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
4 images, 0 KB saveable
REVIEW
4 images, 0 KB saveable
Warning::
https://www.ugent.be/img/dcom/portretten/francesca... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
4 images 300 KB
0 oversized -0 KB
4 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

B
JS Execution Cost
933ms total JS execution
REVIEW
933ms total JS execution
Info::
https://ugent.containers.piwik.pro/e1b032d5-e42b-4...: 220ms CPU time
Info::
Unattributable: 195ms CPU time
Info::
https://www.ugent.be/: 166ms CPU time
Info::
https://www.ugent.be/++webresource++63cfd711-b569-...: 130ms CPU time
Info::
https://www.ugent.be/++webresource++376a8ea8-4a93-...: 122ms CPU time
Warning::
Third-party scripts: 933ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 20% Script Parsing & Compilation 15% Style & Layout 13% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://ugent.containers.piwik.pro/e1b032d5-e42b-42b5-8b73-ea4347239c3d.js220ms152ms30ms3rd
Unattributable195ms5ms0ms3rd
https://www.ugent.be/166ms15ms3ms3rd
https://www.ugent.be/++webresource++63cfd711-b569-56e9-9ddd-422f58e3d9c3/++plone++facetednavigation/faceted-jquery.min.js130ms62ms39ms3rd
https://www.ugent.be/++webresource++376a8ea8-4a93-5a30-b955-185ed5d3c57d/++plone++customstatic/bundle/bundle.min.js122ms82ms29ms3rd
https://www.ugent.be/++webresource++376a8ea8-4a93-5a30-b955-185ed5d3c57d/++plone++customstatic/bundle/chunks/39245.ebb195717fb30b2b8acf.min.js101ms81ms15ms3rd
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
6 fonts (370 KB)
PASS
6 fonts (370 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

370 KB total

Render-blocking

0

of 6

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 FCP 4.1 s LCP 16.6 shttps://www.ugent.be/++theme++ugent/static/fonts/bootstrap/glyphicons-halflings-regular.woff2glyphicons-halflings-re... https://www.ugent.be/++theme++ugent/static/fonts/bootstrap/glyphicons-halflings-regular.woff2 — 17.8 KiB — 55 ms — font-display: swaphttps://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-semilight-web.woffugentpannotext-semiligh... https://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-semilight-web.woff — 68.8 KiB — 58 ms — font-display: swaphttps://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-medium-web.woffugentpannotext-medium-w... https://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-medium-web.woff — 70.3 KiB — 60 ms — font-display: swaphttps://www.ugent.be/++theme++ugent/static/fonts/font-awesome/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://www.ugent.be/++theme++ugent/static/fonts/font-awesome/fontawesome-webfont.woff2?v=4.7.0 — 75.5 KiB — 66 ms — font-display: swaphttps://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-semibold-web.woffugentpannotext-semibold... https://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-semibold-web.woff — 68.1 KiB — 59 ms — font-display: swaphttps://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-normal-web.woffugentpannotext-normal-w... https://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-normal-web.woff — 69.0 KiB — 65 ms — font-display: swap
glyphicons-halflings-re... woff2 swap
Size 18 KB
Load time 55 ms
Start 373 ms
Risk FOUT — text flashes from fallback to web font
ugentpannotext-semiligh... woff swap
Size 69 KB
Load time 58 ms
Start 374 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
ugentpannotext-medium-w... woff swap
Size 70 KB
Load time 60 ms
Start 374 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fontawesome-webfont.woff2 woff2 swap
Size 76 KB
Load time 66 ms
Start 374 ms
Risk FOUT — text flashes from fallback to web font
ugentpannotext-semibold... woff swap
Size 68 KB
Load time 59 ms
Start 374 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
ugentpannotext-normal-w... woff swap
Size 69 KB
Load time 65 ms
Start 374 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~83 KB and ~166 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+
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
52 requests over 1424ms
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 FCP 4.1 s LCP 16.6 shttps://ugent.be// https://ugent.be/ — 301 — 109 B — 102 ms — h2https://www.ugent.be/www.ugent.be/ https://www.ugent.be/ — 200 — 8.0 KiB — 106 ms — h2https://www.ugent.be/++theme++ugent/static/js/vendor/modernizr-custom.min.jswww.ugent.be/++theme++ugent/static/... https://www.ugent.be/++theme++ugent/static/js/vendor/modernizr-custom.min.js — 200 — 8.7 KiB — 160 ms — h2https://www.ugent.be/++theme++ugent/static/js/vendor/picturefill.min.jswww.ugent.be/++theme++ugent/static/... https://www.ugent.be/++theme++ugent/static/js/vendor/picturefill.min.js — 200 — 11.7 KiB — 160 ms — h2https://www.ugent.be/++webresource++c314c93c-981d-5336-947b-793d25c196b7/++plone++ugent.election/election.csswww.ugent.be/++webresource++c314c93... https://www.ugent.be/++webresource++c314c93c-981d-5336-947b-793d25c196b7/++plone++ugent.election/election.css — 200 — 1.2 KiB — 75 ms — h2https://www.ugent.be/++webresource++b6e63fde-4269-5984-a67a-480840700e9a/++resource++easyform.csswww.ugent.be/++webresource++b6e63fd... https://www.ugent.be/++webresource++b6e63fde-4269-5984-a67a-480840700e9a/++resource++easyform.css — 200 — 616 B — 48 ms — h2https://www.ugent.be/++webresource++d5804eac-48ee-5c69-8389-75ac65829cb3/++plone++facetednavigation/faceted-jquery.min.csswww.ugent.be/++webresource++d5804ea... https://www.ugent.be/++webresource++d5804eac-48ee-5c69-8389-75ac65829cb3/++plone++facetednavigation/faceted-jquery.min.css — 200 — 13.5 KiB — 50 ms — h2https://www.ugent.be/++webresource++96c3556c-9d70-5d58-951a-ff5109db53b8/++plone++facetednavigation/faceted-view.min.csswww.ugent.be/++webresource++96c3556... https://www.ugent.be/++webresource++96c3556c-9d70-5d58-951a-ff5109db53b8/++plone++facetednavigation/faceted-view.min.css — 200 — 1.8 KiB — 50 ms — h2https://www.ugent.be/++webresource++688bdb99-253c-5b8b-bd8b-90f9b92d6ab0/++plone++facetednavigation/faceted-edit.min.csswww.ugent.be/++webresource++688bdb9... https://www.ugent.be/++webresource++688bdb99-253c-5b8b-bd8b-90f9b92d6ab0/++plone++facetednavigation/faceted-edit.min.css — 200 — 1.5 KiB — 74 ms — h2https://www.ugent.be/++webresource++ac83a459-aa2c-5a45-80a9-9d3e95ae0847/++plone++static/plone-fullscreen/fullscreen.csswww.ugent.be/++webresource++ac83a45... https://www.ugent.be/++webresource++ac83a459-aa2c-5a45-80a9-9d3e95ae0847/++plone++static/plone-fullscreen/fullscreen.css — 200 — 488 B — 49 ms — h2https://www.ugent.be/++webresource++01fdfe24-6dc9-54a2-8e2b-cd8c291feef2//++theme++ugent/static/css/screen.csswww.ugent.be/++webresource++01fdfe2... https://www.ugent.be/++webresource++01fdfe24-6dc9-54a2-8e2b-cd8c291feef2//++theme++ugent/static/css/screen.css — 200 — 54.9 KiB — 76 ms — h2https://www.ugent.be/++webresource++e6de86f7-53a3-52ed-9cf4-a42f379d006b/@@custom.csswww.ugent.be/++webresource++e6de86f... https://www.ugent.be/++webresource++e6de86f7-53a3-52ed-9cf4-a42f379d006b/@@custom.css — 200 — 454 B — 107 ms — h2https://www.ugent.be/++theme++ugent/static/images/logo_ugent_nl.svgwww.ugent.be/++theme++ugent/static/... https://www.ugent.be/++theme++ugent/static/images/logo_ugent_nl.svg — 200 — 3.0 KiB — 74 ms — h2https://www.ugent.be/img/dcom/portretten/francesca-albanese.jpg/@@images/image/mobile-fullwww.ugent.be/img/dcom/portretten/fr... https://www.ugent.be/img/dcom/portretten/francesca-albanese.jpg/@@images/image/mobile-full — 200 — 118.9 KiB — 160 ms — h2https://www.ugent.be/++webresource++77ec673d-79a3-5550-adf0-2860512ce4a7/++plone++ugent.election/election.jswww.ugent.be/++webresource++77ec673... https://www.ugent.be/++webresource++77ec673d-79a3-5550-adf0-2860512ce4a7/++plone++ugent.election/election.js — 200 — 833 B — 108 ms — h2https://www.ugent.be/++webresource++376a8ea8-4a93-5a30-b955-185ed5d3c57d/++plone++customstatic/bundle/bundle.min.jswww.ugent.be/++webresource++376a8ea... https://www.ugent.be/++webresource++376a8ea8-4a93-5a30-b955-185ed5d3c57d/++plone++customstatic/bundle/bundle.min.js — 200 — 264.8 KiB — 156 ms — h2https://www.ugent.be/++webresource++57e92703-4b0c-5dac-80f4-a510e9332fff/++theme++ugent/static/js/main.min.jswww.ugent.be/++webresource++57e9270... https://www.ugent.be/++webresource++57e92703-4b0c-5dac-80f4-a510e9332fff/++theme++ugent/static/js/main.min.js — 200 — 1.1 KiB — 160 ms — h2https://www.ugent.be/++webresource++63cfd711-b569-56e9-9ddd-422f58e3d9c3/++plone++facetednavigation/faceted-jquery.min.jswww.ugent.be/++webresource++63cfd71... https://www.ugent.be/++webresource++63cfd711-b569-56e9-9ddd-422f58e3d9c3/++plone++facetednavigation/faceted-jquery.min.js — 200 — 458.9 KiB — 190 ms — h2https://www.ugent.be/++webresource++09e0b31e-300a-599a-a589-ae4f34b73627/++plone++facetednavigation/faceted-view.min.jswww.ugent.be/++webresource++09e0b31... https://www.ugent.be/++webresource++09e0b31e-300a-599a-a589-ae4f34b73627/++plone++facetednavigation/faceted-view.min.js — 200 — 76.4 KiB — 166 ms — h2https://www.ugent.be/++webresource++9ff7b2fc-bb60-5b7e-a094-49a1fe46d833/++plone++facetednavigation/faceted-edit.min.jswww.ugent.be/++webresource++9ff7b2f... https://www.ugent.be/++webresource++9ff7b2fc-bb60-5b7e-a094-49a1fe46d833/++plone++facetednavigation/faceted-edit.min.js — 200 — 47.6 KiB — 163 ms — h2https://www.ugent.be/++webresource++6aa4c841-faf5-51e8-8109-90bd97e7aa07/++plone++static/plone-fullscreen/fullscreen.jswww.ugent.be/++webresource++6aa4c84... https://www.ugent.be/++webresource++6aa4c841-faf5-51e8-8109-90bd97e7aa07/++plone++static/plone-fullscreen/fullscreen.js — 200 — 795 B — 191 ms — h2https://connect.getflowbox.com/flowbox.jsconnect.getflowbox.com/flowbox.js https://connect.getflowbox.com/flowbox.js — 200 — 8.1 KiB — 44 ms — h2https://www.ugent.be/++theme++ugent/static/icons/manifest.jsonwww.ugent.be/++theme++ugent/static/... https://www.ugent.be/++theme++ugent/static/icons/manifest.json — 200 — 676 B — 105 ms — h2https://ugent.containers.piwik.pro/e1b032d5-e42b-42b5-8b73-ea4347239c3d.jsugent.containers.piwik.pro/e1b032d5... https://ugent.containers.piwik.pro/e1b032d5-e42b-42b5-8b73-ea4347239c3d.js — 200 — 75.1 KiB — 176 ms — h2https://www.ugent.be/nl/@@images/central_subsite_imagewww.ugent.be/nl/@@images/central_su... https://www.ugent.be/nl/@@images/central_subsite_image — 200 — 177.4 KiB — 80 ms — h2https://www.ugent.be/++theme++ugent/static/fonts/bootstrap/glyphicons-halflings-regular.woff2www.ugent.be/++theme++ugent/static/... https://www.ugent.be/++theme++ugent/static/fonts/bootstrap/glyphicons-halflings-regular.woff2 — 200 — 17.8 KiB — 55 ms — h2https://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-semilight-web.woffwww.ugent.be/++theme++ugent/static/... https://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-semilight-web.woff — 200 — 68.8 KiB — 58 ms — h2https://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-medium-web.woffwww.ugent.be/++theme++ugent/static/... https://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-medium-web.woff — 200 — 70.3 KiB — 60 ms — h2https://www.ugent.be/++theme++ugent/static/fonts/font-awesome/fontawesome-webfont.woff2?v=4.7.0www.ugent.be/++theme++ugent/static/... https://www.ugent.be/++theme++ugent/static/fonts/font-awesome/fontawesome-webfont.woff2?v=4.7.0 — 200 — 75.5 KiB — 66 ms — h2https://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-semibold-web.woffwww.ugent.be/++theme++ugent/static/... https://www.ugent.be/++theme++ugent/static/fonts/panno/ugentpannotext-semibold-web.woff — 200 — 68.1 KiB — 59 ms — h2
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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 933ms · 1014KB · €10/mo
ugent.containers.piwik.pro
Other
Costly
Execution 220ms
Transfer 75 KB
Unused 39%
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 195ms
Transfer 0 KB
Monthly Cost €2/mo
www.ugent.be
Other
Optional
Execution 166ms
Transfer 8 KB
Monthly Cost €2/mo
www.ugent.be
Other
Optional
Execution 130ms
Transfer 459 KB
Unused 91%
Monthly Cost €1/mo
www.ugent.be
Other
Optional
Execution 122ms
Transfer 265 KB
Unused 42%
Monthly Cost €1/mo
www.ugent.be
Other
Optional
Execution 101ms
Transfer 207 KB
Unused 81%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • ugent.containers.piwik.pro adds 220ms 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.

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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

ugent.containers.piwik.pro takes 220ms 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.ugent.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

81% of www.ugent.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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