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https://uni-bonn.de

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
79
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.
100
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.

1.20 s

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

2.03 s

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

56 ms

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

0.003

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

3.76 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.

2.18 s

Page Load Progression

1.0 s
2.1 s
3.1 s
4.2 s
5.2 s
6.2 s
7.3 s
8.3 s
Checks
15
5 PASS 4 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 (1.8 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
12 scripts, 502 KB unused
FIX
12 scripts, 502 KB unused
Warning::
https://www.uni-bonn.de/++theme++interaktiv.baseti...: 144 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uni-bonn.de/++theme++unibonn.theme/js/...: 137 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uni-bonn.de/++theme++unibonn.theme/js/...: 66 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uni-bonn.de/++webresource++34f34eab-a1...: 50 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uni-bonn.de/++webresource++34f34eab-a1...: 41 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 502 KB
502 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.uni-bonn.de/++theme++interaktiv.basetiles.components/js/mathjax/tex-mml-chtml.js264 KB144 KB (55%)✓3rd
https://www.uni-bonn.de/++theme++unibonn.theme/js/libs.js?tag=15-04-2026_10-31-48202 KB137 KB (68%)✓3rd
https://www.uni-bonn.de/++theme++unibonn.theme/js/script.js?tag=15-04-2026_10-31-4893 KB66 KB (72%)✓3rd
https://www.uni-bonn.de/++webresource++34f34eab-a19d-533e-a464-ddf672c6f922/++plone++static/bundle-plone/chunks/94174.51e677dc0d267848ecca.min.js63 KB50 KB (81%)✓3rd
https://www.uni-bonn.de/++webresource++34f34eab-a19d-533e-a464-ddf672c6f922/++plone++static/bundle-plone/bundle.min.js104 KB41 KB (40%)✓3rd
https://webstat.hrz.uni-bonn.de/matomo.js67 KB38 KB (57%)✓3rd
https://www.uni-bonn.de/++webresource++34f34eab-a19d-533e-a464-ddf672c6f922/++plone++static/bundle-plone/chunks/7035.35ca9961e87c57b41938.min.js29 KB27 KB (100%)✓3rd
https://www.uni-bonn.de/++webresource++6aa4c841-faf5-51e8-8109-90bd97e7aa07/++plone++static/plone-fullscreen/fullscreen.js2 KB—✓3rd
https://www.uni-bonn.de/++webresource++34f34eab-a19d-533e-a464-ddf672c6f922/++plone++static/bundle-plone/chunks/4523.dd7bfbfce434b99c0c6d.min.js9 KB—✓3rd
https://www.uni-bonn.de/++webresource++34f34eab-a19d-533e-a464-ddf672c6f922/++plone++static/bundle-plone/chunks/64061.dee5804717c65fd6a61f.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
44 resources · 1.8 MB · 502 KB savings available
FIX
44 resources · 1.8 MB · 502 KB savings available
Warning::
Page weight 812 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~502 KB of savings available
Warning::
43 third-party resources (100% of weight)
Info::
4 resources over 200KB
44 resources · 1.8 MiB · 43 third-party 811.8 KiB over 1MB target
JavaScript 46% · 846.6 KiB
Image 26% · 475.1 KiB
CSS 15% · 270.2 KiB
Font 12% · 216.1 KiB
Document 1% · 21.1 KiB
Other 0% · 6.6 KiB

~501.6 KiB of savings available

Remove unused JavaScript: 501.6 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.

C
Page Weight Budget
Action
1.8 MB transferred, 44 requests
REVIEW
1.8 MB transferred, 44 requests
Info::
Page weighs 5.3 MB (1.8 MB transferred)
Warning::
JavaScript is 847 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 847 KB
Info::
CSS is 270 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 270 KB
Info::
Fonts are 216 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 216 KB
Info::
44 HTTP requests
Info::
Estimated 0.38 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
44 requests
0.38 g CO2 per page load
JavaScript 846.6 KiB 46%
Images 455.9 KiB 25%
CSS 270.2 KiB 15%
Fonts 216.1 KiB 12%
Other 21.8 KiB 1%
HTML 20.0 KiB 1%
Other 4.9 KiB 0%
Other 207 B 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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

B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
https://www.uni-bonn.de/de/++theme++unibonn.theme/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 456 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
956ms total JS execution
REVIEW
956ms total JS execution
Warning::
https://www.uni-bonn.de/de: 405ms CPU time
Info::
https://www.uni-bonn.de/++webresource++34f34eab-a1...: 180ms CPU time
Info::
https://www.uni-bonn.de/++theme++interaktiv.baseti...: 147ms CPU time
Info::
Unattributable: 136ms CPU time
Info::
https://www.uni-bonn.de/++theme++unibonn.theme/js/...: 88ms CPU time
Warning::
Third-party scripts: 956ms (100% of total)

Main Thread Breakdown

Other 37% Script Evaluation 29% Style & Layout 18% Script Parsing & Compilation 8% Parse HTML & CSS 5% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.uni-bonn.de/de405ms26ms1ms3rd
https://www.uni-bonn.de/++webresource++34f34eab-a19d-533e-a464-ddf672c6f922/++plone++static/bundle-plone/bundle.min.js180ms75ms9ms3rd
https://www.uni-bonn.de/++theme++interaktiv.basetiles.components/js/mathjax/tex-mml-chtml.js147ms109ms31ms3rd
Unattributable136ms6ms0ms3rd
https://www.uni-bonn.de/++theme++unibonn.theme/js/libs.js?tag=15-04-2026_10-31-4888ms43ms25ms3rd
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
11 fonts (216 KB)
PASS
11 fonts (216 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

216 KB total

Render-blocking

0

of 11

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 FCP 1.2 s LCP 2.0 shttps://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/exo2/exo-2-v9-latin-ext_latin-500.woff2exo-2-v9-latin-ext_lati... https://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/exo2/exo-2-v9-latin-ext_latin-500.woff2 — 23.6 KiB — 202 ms — font-display: swaphttps://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/exo2/exo-2-v9-latin-ext_latin-300.woff2exo-2-v9-latin-ext_lati... https://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/exo2/exo-2-v9-latin-ext_latin-300.woff2 — 22.9 KiB — 210 ms — font-display: swaphttps://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/exo2/exo-2-v9-latin-ext_latin-regular.woff2exo-2-v9-latin-ext_lati... https://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/exo2/exo-2-v9-latin-ext_latin-regular.woff2 — 22.9 KiB — 246 ms — font-display: swaphttps://www.uni-bonn.de/site/++theme++unibonn.theme/fonts/uni-bonn.ttfuni-bonn.ttf https://www.uni-bonn.de/site/++theme++unibonn.theme/fonts/uni-bonn.ttf — 16.6 KiB — 240 ms — font-display: swaphttps://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/exo2/exo-2-v9-latin-ext_latin-600.woff2exo-2-v9-latin-ext_lati... https://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/exo2/exo-2-v9-latin-ext_latin-600.woff2 — 23.8 KiB — 250 ms — font-display: swaphttps://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/roboto/roboto-v20-latin-ext_latin-regular.woff2roboto-v20-latin-ext_la... https://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/roboto/roboto-v20-latin-ext_latin-regular.woff2 — 23.6 KiB — 269 ms — font-display: swaphttps://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/roboto/roboto-v20-latin-ext_latin-500.woff2roboto-v20-latin-ext_la... https://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/latin-ext/roboto/roboto-v20-latin-ext_latin-500.woff2 — 23.7 KiB — 260 ms — font-display: swaphttps://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/icons/interaktiv-icon-basetilestheme.ttfinteraktiv-icon-basetil... https://www.uni-bonn.de/++theme++unibonn.theme/css/++theme++interaktiv.basetiles/fonts/icons/interaktiv-icon-basetilestheme.ttf — 17.3 KiB — 278 ms — font-display: swaphttps://www.uni-bonn.de/font-families/unibonn-fonts/view/++widget++form.widgets.file_woff/@@download@@download https://www.uni-bonn.de/font-families/unibonn-fonts/view/++widget++form.widgets.file_woff/@@download — 16.3 KiB — 227 ms — font-display: swaphttps://www.uni-bonn.de/font-families/uni-bonn-official/view/++widget++form.widgets.file_woff/@@download@@download https://www.uni-bonn.de/font-families/uni-bonn-official/view/++widget++form.widgets.file_woff/@@download — 17.5 KiB — 235 ms — font-display: swaphttps://www.uni-bonn.de/font-families/kampagne/view/++widget++form.widgets.file_woff/@@download@@download https://www.uni-bonn.de/font-families/kampagne/view/++widget++form.widgets.file_woff/@@download — 8.0 KiB — 229 ms — font-display: swap
exo-2-v9-latin-ext_lati... woff2 swap
Size 24 KB
Load time 202 ms
Start 4.3 s
Risk FOUT — text flashes from fallback to web font
exo-2-v9-latin-ext_lati... woff2 swap
Size 23 KB
Load time 210 ms
Start 4.3 s
Risk FOUT — text flashes from fallback to web font
exo-2-v9-latin-ext_lati... woff2 swap
Size 23 KB
Load time 246 ms
Start 4.3 s
Risk FOUT — text flashes from fallback to web font
uni-bonn.ttf ttf swap
Size 17 KB
Load time 240 ms
Start 4.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
exo-2-v9-latin-ext_lati... woff2 swap
Size 24 KB
Load time 250 ms
Start 4.3 s
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-ext_la... woff2 swap
Size 24 KB
Load time 269 ms
Start 4.3 s
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-ext_la... woff2 swap
Size 24 KB
Load time 260 ms
Start 4.3 s
Risk FOUT — text flashes from fallback to web font
interaktiv-icon-basetil... ttf swap
Size 17 KB
Load time 278 ms
Start 4.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
@@download woff swap
Size 16 KB
Load time 227 ms
Start 4.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
@@download woff swap
Size 17 KB
Load time 235 ms
Start 4.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
@@download woff swap
Size 8 KB
Load time 229 ms
Start 4.3 s
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 ~23 KB and ~46 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
Network Waterfall
44 requests over 6226ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 1.2 s LCP 2.0 shttps://uni-bonn.de// https://uni-bonn.de/ — 308 — 1.1 KiB — 799 ms — h2https://www.uni-bonn.de/www.uni-bonn.de/ https://www.uni-bonn.de/ — 302 — 1.5 KiB — 1.0 s — h2https://www.uni-bonn.de/dewww.uni-bonn.de/de https://www.uni-bonn.de/de — 200 — 20.0 KiB — 1.3 s — h2https://www.uni-bonn.de/++theme++barceloneta/css/barceloneta.min.csswww.uni-bonn.de/++theme++barcelonet... https://www.uni-bonn.de/++theme++barceloneta/css/barceloneta.min.css — 200 — 37.8 KiB — 413 ms — h2https://www.uni-bonn.de/++theme++unibonn.theme/css/style.css?tag=15-04-2026_10-31-15www.uni-bonn.de/++theme++unibonn.th... https://www.uni-bonn.de/++theme++unibonn.theme/css/style.css?tag=15-04-2026_10-31-15 — 200 — 226.3 KiB — 809 ms — h2https://www.uni-bonn.de/++webresource++b6e63fde-4269-5984-a67a-480840700e9a/++resource++easyform.csswww.uni-bonn.de/++webresource++b6e6... https://www.uni-bonn.de/++webresource++b6e63fde-4269-5984-a67a-480840700e9a/++resource++easyform.css — 200 — 1.9 KiB — 808 ms — h2https://www.uni-bonn.de/++webresource++f30a16e6-dac4-5f5f-a036-b24364abdfc8/++resource++plone.app.multilingual.stylesheet/multilingual.csswww.uni-bonn.de/++webresource++f30a... https://www.uni-bonn.de/++webresource++f30a16e6-dac4-5f5f-a036-b24364abdfc8/++resource++plone.app.multilingual.stylesheet/multilingual.css — 200 — 2.4 KiB — 808 ms — h2https://www.uni-bonn.de/++webresource++ac83a459-aa2c-5a45-80a9-9d3e95ae0847/++plone++static/plone-fullscreen/fullscreen.csswww.uni-bonn.de/++webresource++ac83... https://www.uni-bonn.de/++webresource++ac83a459-aa2c-5a45-80a9-9d3e95ae0847/++plone++static/plone-fullscreen/fullscreen.css — 200 — 1.8 KiB — 808 ms — h2https://www.uni-bonn.de/++webresource++34f34eab-a19d-533e-a464-ddf672c6f922/++plone++static/bundle-plone/bundle.min.jswww.uni-bonn.de/++webresource++34f3... https://www.uni-bonn.de/++webresource++34f34eab-a19d-533e-a464-ddf672c6f922/++plone++static/bundle-plone/bundle.min.js — 200 — 104.0 KiB — 815 ms — h2https://www.uni-bonn.de/++theme++unibonn.theme/js/libs.js?tag=15-04-2026_10-31-48www.uni-bonn.de/++theme++unibonn.th... https://www.uni-bonn.de/++theme++unibonn.theme/js/libs.js?tag=15-04-2026_10-31-48 — 200 — 202.3 KiB — 1.0 s — h2https://www.uni-bonn.de/++theme++unibonn.theme/js/script.js?tag=15-04-2026_10-31-48www.uni-bonn.de/++theme++unibonn.th... https://www.uni-bonn.de/++theme++unibonn.theme/js/script.js?tag=15-04-2026_10-31-48 — 200 — 93.4 KiB — 1.0 s — h2https://www.uni-bonn.de/de/++theme++unibonn.theme/images/logos/logo_desktop.svgwww.uni-bonn.de/de/++theme++unibonn... https://www.uni-bonn.de/de/++theme++unibonn.theme/images/logos/logo_desktop.svg — 200 — 169.9 KiB — 1.0 s — h2https://www.uni-bonn.de/de/++theme++unibonn.theme/images/logos/logo_mobile.svgwww.uni-bonn.de/de/++theme++unibonn... 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https://webstat.hrz.uni-bonn.de/matomo.php?action_name=Universit%C3%A4t%20Bonn&idsite=2&rec=1&r=063413&h=22&m=35&s=59&url=https%3A%2F%2Fwww.uni-bonn.de%2Fde&_id=e0fab1038ec1f086&_idn=1&send_image=0&_refts=0&pv_id=3aq3OG&pf_net=0&pf_srv=1057&pf_tfr=199&pf_dm1=1638&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224.0.0.0%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146.0.7680.164%22%7D%5D%2C%22mobile%22%3Afalse%2C%22model%22%3A%22%22%2C%22platform%22%3A%22macOS%22%2C%22platformVersion%22%3A%2210.15.7%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=800x600 — 204 — 207 B — 233 ms — h2https://www.uni-bonn.de/de/medien-startseite-uni-bonn/grunwald-oasystem-body.webp/@@images/image/thumbwww.uni-bonn.de/de/medien-startseit... https://www.uni-bonn.de/de/medien-startseite-uni-bonn/grunwald-oasystem-body.webp/@@images/image/thumb — 200 — 3.6 KiB — 201 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 956ms · 590KB · €10/mo
www.uni-bonn.de
Other
Costly
Execution 405ms
Transfer 20 KB
Monthly Cost €4/mo
www.uni-bonn.de
Other
Optional
Execution 180ms
Transfer 104 KB
Unused 40%
Monthly Cost €2/mo
www.uni-bonn.de
Other
Optional
Execution 147ms
Transfer 264 KB
Unused 55%
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 136ms
Transfer 0 KB
Monthly Cost €1/mo
www.uni-bonn.de
Other
Optional
Execution 88ms
Transfer 202 KB
Unused 68%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.uni-bonn.de adds 405ms and costs ~€4/month

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

Why this matters

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

Learn more ▾

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

Source: web.dev

www.uni-bonn.de takes 405ms 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

55% of www.uni-bonn.de'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

68% of www.uni-bonn.de'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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