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https://uni-muenster.de

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
3
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
42
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
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.

2.54 s

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

5.92 s

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

13 ms

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

0.885

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

9.58 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.

8.26 s

Page Load Progression

2.0 s
3.9 s
5.9 s
7.8 s
9.8 s
11.7 s
13.7 s
15.7 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
28 resources · 1.5 MB · 65 KB savings available
FIX
28 resources · 1.5 MB · 65 KB savings available
Warning::
Page weight 473 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~65 KB of savings available
Warning::
27 third-party resources (100% of weight)
Info::
2 resources over 200KB
28 resources · 1.5 MiB · 27 third-party 473.1 KiB over 1MB target
Image 77% · 1.1 MiB
JavaScript 11% · 166.6 KiB
Font 9% · 140.2 KiB
CSS 2% · 31.9 KiB
Document 1% · 10.0 KiB
Other 0% · 274 B

~65.5 KiB of savings available

Remove unused JavaScript: 65.5 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

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

B
Page Weight Budget
1.5 MB transferred, 28 requests
REVIEW
1.5 MB transferred, 28 requests
Info::
Page weighs 1.7 MB (1.5 MB transferred)
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
28 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
28 requests
0.31 g CO2 per page load
Images 1.1 MiB 77%
JavaScript 166.6 KiB 11%
Fonts 140.2 KiB 9%
CSS 31.9 KiB 2%
HTML 9.2 KiB 1%
Other 3.6 KiB 0%
Other 274 B 0%
0 2.4 MB 4.9 MB
Under budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

B
Image Optimization
8 images, 0 KB saveable
REVIEW
8 images, 0 KB saveable
Info::
All images are well-optimized
8 images 1.1 MB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1792ms total JS execution
REVIEW
1792ms total JS execution
Warning::
https://www.uni-muenster.de/de/: 945ms CPU time
Warning::
Unattributable: 344ms CPU time
Info::
https://www.uni-muenster.de/wwu/js/owl.carousel2.j...: 193ms CPU time
Info::
https://www.uni-muenster.de/wwu/js/jquery.min.js: 168ms CPU time
Info::
https://www.uni-muenster.de/wwu/js/lazysizes.js: 85ms CPU time
Warning::
Third-party scripts: 1792ms (100% of total)

Main Thread Breakdown

Style & Layout 37% Other 28% Script Evaluation 20% Rendering 10%
ScriptTotalScriptingParse/CompileParty
https://www.uni-muenster.de/de/945ms9ms1ms3rd
Unattributable344ms14ms0ms3rd
https://www.uni-muenster.de/wwu/js/owl.carousel2.js193ms140ms7ms3rd
https://www.uni-muenster.de/wwu/js/jquery.min.js168ms114ms12ms3rd
https://www.uni-muenster.de/wwu/js/lazysizes.js85ms29ms2ms3rd
https://piwik.uni-muenster.de/piwik.js58ms44ms13ms3rd
B
JS Bundles
6 scripts, 65 KB unused
REVIEW
6 scripts, 65 KB unused
Warning::
https://piwik.uni-muenster.de/piwik.js: 65 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uni-muenster.de/wwu/js/main.js: unminified — 2 KB could be saved
Info::
Total unused JavaScript: 65 KB
65 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://piwik.uni-muenster.de/piwik.js103 KB65 KB (64%)✓3rd
https://www.uni-muenster.de/wwu/js/modernizr.wwu.js4 KB—✓3rd
https://www.uni-muenster.de/wwu/js/jquery.min.js30 KB—✓3rd
https://www.uni-muenster.de/wwu/js/main.js11 KB—✗3rd
https://www.uni-muenster.de/wwu/js/lazysizes.js5 KB—✓3rd
https://www.uni-muenster.de/wwu/js/owl.carousel2.js13 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

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
3 fonts (140 KB)
PASS
3 fonts (140 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

140 KB total

Render-blocking

0

of 3

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 FCP 2.5 s LCP 5.9 shttps://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/metawebpro-bold.woffmetawebpro-bold.woff https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/metawebpro-bold.woff — 64.2 KiB — 3.7 s — font-display: swaphttps://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/wwu_symbol.woffwwu_symbol.woff https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/wwu_symbol.woff — 11.1 KiB — 1.1 s — font-display: swaphttps://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/metawebpro-normal.woffmetawebpro-normal.woff https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/metawebpro-normal.woff — 64.9 KiB — 752 ms — font-display: swap
metawebpro-bold.woff woff swap
Size 64 KB
Load time 3.7 s
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
wwu_symbol.woff woff swap
Size 11 KB
Load time 1.1 s
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
metawebpro-normal.woff woff swap
Size 65 KB
Load time 752 ms
Start 2.9 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 ~42 KB and ~84 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
28 requests over 16930ms
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 2.5 s LCP 5.9 shttps://uni-muenster.de// https://uni-muenster.de/ — 301 — 298 B — 807 ms — http/1.1https://www.uni-muenster.de/www.uni-muenster.de/ https://www.uni-muenster.de/ — 301 — 300 B — 918 ms — http/1.1https://www.uni-muenster.de/dewww.uni-muenster.de/de https://www.uni-muenster.de/de — 301 — 301 B — 210 ms — http/1.1https://www.uni-muenster.de/de/www.uni-muenster.de/de/ https://www.uni-muenster.de/de/ — 200 — 9.2 KiB — 216 ms — http/1.1https://www.uni-muenster.de/wwu/css/main.csswww.uni-muenster.de/wwu/css/main.cs... https://www.uni-muenster.de/wwu/css/main.css — 200 — 25.5 KiB — 410 ms — http/1.1https://www.uni-muenster.de/wwucss/7ab51d/primary.csswww.uni-muenster.de/wwucss/7ab51d/p... https://www.uni-muenster.de/wwucss/7ab51d/primary.css — 200 — 1.0 KiB — 266 ms — http/1.1https://www.uni-muenster.de/wwucss/006e89/secondary.csswww.uni-muenster.de/wwucss/006e89/s... https://www.uni-muenster.de/wwucss/006e89/secondary.css — 200 — 1.3 KiB — 533 ms — http/1.1https://www.uni-muenster.de/wwu/js/modernizr.wwu.jswww.uni-muenster.de/wwu/js/moderniz... https://www.uni-muenster.de/wwu/js/modernizr.wwu.js — 200 — 4.4 KiB — 622 ms — http/1.1https://www.uni-muenster.de/imperia/md/images/allgemein/farbunabhaengig/unims.svgwww.uni-muenster.de/imperia/md/imag... https://www.uni-muenster.de/imperia/md/images/allgemein/farbunabhaengig/unims.svg — 200 — 1.6 KiB — 771 ms — http/1.1https://www.uni-muenster.de/news/data/img/2026/03/15324-wguCOBOz-webML@2x.jpgwww.uni-muenster.de/news/data/img/2... https://www.uni-muenster.de/news/data/img/2026/03/15324-wguCOBOz-webML@2x.jpg — 200 — 211.2 KiB — 14.0 s — http/1.1https://www.uni-muenster.de/news/data/img/2026/04/web-3AxRIK2X-webML@2x.jpgwww.uni-muenster.de/news/data/img/2... https://www.uni-muenster.de/news/data/img/2026/04/web-3AxRIK2X-webML@2x.jpg — 200 — 159.1 KiB — 614 ms — http/1.1https://www.uni-muenster.de/news/data/img/2026/03/15322-73uI2dpJ-webML@2x.jpegwww.uni-muenster.de/news/data/img/2... https://www.uni-muenster.de/news/data/img/2026/03/15322-73uI2dpJ-webML@2x.jpeg — 200 — 117.9 KiB — 6.4 s — http/1.1https://www.uni-muenster.de/news/data/img/2026/04/15343-fKF2VXz3-webML@2x.jpgwww.uni-muenster.de/news/data/img/2... https://www.uni-muenster.de/news/data/img/2026/04/15343-fKF2VXz3-webML@2x.jpg — 200 — 132.6 KiB — 2.5 s — http/1.1https://www.uni-muenster.de/wwu/js/jquery.min.jswww.uni-muenster.de/wwu/js/jquery.m... https://www.uni-muenster.de/wwu/js/jquery.min.js — 200 — 30.2 KiB — 2.3 s — http/1.1https://www.uni-muenster.de/news/data/img/2026/04/15347-80yZ75n7-heroQuadM@2x.jpgwww.uni-muenster.de/news/data/img/2... https://www.uni-muenster.de/news/data/img/2026/04/15347-80yZ75n7-heroQuadM@2x.jpg — 200 — 363.9 KiB — 1.2 s — http/1.1https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/metawebpro-bold.woffwww.uni-muenster.de/imperia/md/cont... https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/metawebpro-bold.woff — 200 — 64.2 KiB — 3.7 s — http/1.1https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/wwu_symbol.woffwww.uni-muenster.de/imperia/md/cont... https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/wwu_symbol.woff — 200 — 11.1 KiB — 1.1 s — http/1.1https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/metawebpro-normal.woffwww.uni-muenster.de/imperia/md/cont... https://www.uni-muenster.de/imperia/md/content/allgemein/farbunabhaengig/fonts/metawebpro-normal.woff — 200 — 64.9 KiB — 752 ms — http/1.1https://www.uni-muenster.de/wwu/js/main.jswww.uni-muenster.de/wwu/js/main.js https://www.uni-muenster.de/wwu/js/main.js — 200 — 11.1 KiB — 223 ms — http/1.1https://www.uni-muenster.de/wwu/js/lazysizes.jswww.uni-muenster.de/wwu/js/lazysize... https://www.uni-muenster.de/wwu/js/lazysizes.js — 200 — 4.7 KiB — 217 ms — http/1.1https://www.uni-muenster.de/imperia/md/images/zentral/weiterbildung/fittosize_730_365_addf80b2748262cc0cf7ea51e693f316_pl_200923_3338_mittel.jpegwww.uni-muenster.de/imperia/md/imag... https://www.uni-muenster.de/imperia/md/images/zentral/weiterbildung/fittosize_730_365_addf80b2748262cc0cf7ea51e693f316_pl_200923_3338_mittel.jpeg — 200 — 81.4 KiB — 223 ms — http/1.1https://www.uni-muenster.de/imperia/md/images/allgemein/2014/leben/fittosize_730_365_a4ce237d015b36a574a635036abfaf91_studentenwerk_wohnheim_boeselagerstr__4_.jpgwww.uni-muenster.de/imperia/md/imag... https://www.uni-muenster.de/imperia/md/images/allgemein/2014/leben/fittosize_730_365_a4ce237d015b36a574a635036abfaf91_studentenwerk_wohnheim_boeselagerstr__4_.jpg — 200 — 77.7 KiB — 243 ms — http/1.1https://www.uni-muenster.de/wwu/css/print.csswww.uni-muenster.de/wwu/css/print.c... https://www.uni-muenster.de/wwu/css/print.css — 200 — 794 B — 209 ms — http/1.1https://piwik.uni-muenster.de/piwik.jspiwik.uni-muenster.de/piwik.js https://piwik.uni-muenster.de/piwik.js — 200 — 103.2 KiB — 1.4 s — http/1.1https://www.uni-muenster.de/wwu/css/owl.carousel2.csswww.uni-muenster.de/wwu/css/owl.car... https://www.uni-muenster.de/wwu/css/owl.carousel2.css — 200 — 3.2 KiB — 440 ms — http/1.1https://www.uni-muenster.de/wwu/js/owl.carousel2.jswww.uni-muenster.de/wwu/js/owl.caro... https://www.uni-muenster.de/wwu/js/owl.carousel2.js — 200 — 12.9 KiB — 215 ms — http/1.1https://piwik.uni-muenster.de/piwik.php?action_name=Universit%C3%A4t%20M%C3%BCnster&idsite=14&rec=1&r=398822&h=0&m=57&s=5&url=https%3A%2F%2Fwww.uni-muenster.de%2Fde%2F&_id=&_idn=1&send_image=0&_refts=0&pv_id=airxAb&pf_net=0&pf_srv=214&pf_tfr=2&pf_dm1=2985&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%3Atrue%2C%22model%22%3A%22moto%20g%20power%20(2022)%22%2C%22platform%22%3A%22Android%22%2C%22platformVersion%22%3A%2211.0%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=412x823piwik.uni-muenster.de/piwik.php?act... https://piwik.uni-muenster.de/piwik.php?action_name=Universit%C3%A4t%20M%C3%BCnster&idsite=14&rec=1&r=398822&h=0&m=57&s=5&url=https%3A%2F%2Fwww.uni-muenster.de%2Fde%2F&_id=&_idn=1&send_image=0&_refts=0&pv_id=airxAb&pf_net=0&pf_srv=214&pf_tfr=2&pf_dm1=2985&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%3Atrue%2C%22model%22%3A%22moto%20g%20power%20(2022)%22%2C%22platform%22%3A%22Android%22%2C%22platformVersion%22%3A%2211.0%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=412x823 — 204 — 274 B — 2.0 s — http/1.1https://www.uni-muenster.de/imperia/md/images/allgemein/farbunabhaengig/favicon.icowww.uni-muenster.de/imperia/md/imag... https://www.uni-muenster.de/imperia/md/images/allgemein/farbunabhaengig/favicon.ico — 200 — 2.8 KiB — 764 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1792ms · 160KB · €19/mo
www.uni-muenster.de
Other
Costly
Execution 945ms
Transfer 9 KB
Monthly Cost €10/mo
Unattributable
Other
Costly
Execution 344ms
Transfer 0 KB
Monthly Cost €4/mo
www.uni-muenster.de
Other
Optional
Execution 193ms
Transfer 13 KB
Monthly Cost €2/mo
www.uni-muenster.de
Other
Optional
Execution 168ms
Transfer 30 KB
Monthly Cost €2/mo
www.uni-muenster.de
Other
Optional
Execution 85ms
Transfer 5 KB
Monthly Cost €1/mo
piwik.uni-muenster.de
Other
Optional
Execution 58ms
Transfer 103 KB
Unused 64%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.uni-muenster.de adds 945ms and costs ~€10/month
  • Unattributable adds 344ms 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-muenster.de takes 945ms 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 344ms 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 piwik.uni-muenster.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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