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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
86
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
98
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.

500 ms

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

1.86 s

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

0 ms

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

0.048

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

2.42 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.

1.88 s

Page Load Progression

1.1 s
2.2 s
3.3 s
4.4 s
5.5 s
6.6 s
7.7 s
8.8 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
5.5 MB transferred, 60 requests
FIX
5.5 MB transferred, 60 requests
Critical::
Page weighs 6.9 MB (5.5 MB transferred)
Info::
Fonts are 230 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 230 KB
Info::
60 HTTP requests
Info::
Estimated 1.2 g CO2 per page load
5.5 MB / 2.4 MB budget
5.5 MB transferred
60 requests
1.2 g CO2 per page load
Other 4.3 MiB 79%
Images 465.8 KiB 8%
JavaScript 342.4 KiB 6%
Fonts 229.9 KiB 4%
CSS 131.0 KiB 2%
HTML 25.7 KiB 0%
Other 3.0 KiB 0%
Other 253 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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 (5.5 MiB of 5.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
60 resources · 5.5 MB · 170 KB savings available
FIX
60 resources · 5.5 MB · 170 KB savings available
Warning::
Page weight 4.5 MB over 1MB target
Got: 5.5 MB Expected: ≤ 1 MB
Info::
~170 KB of savings available
Warning::
59 third-party resources (100% of weight)
Info::
7 resources over 200KB
60 resources · 5.5 MiB · 59 third-party 4.5 MiB over 1MB target
Other 79% · 4.3 MiB
Image 8% · 468.6 KiB
JavaScript 6% · 342.4 KiB
Font 4% · 229.9 KiB
CSS 2% · 131.0 KiB
Document 0% · 25.7 KiB

~169.8 KiB of savings available

Remove unused JavaScript: 169.8 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
Image Optimization
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://www.ruhr-uni-bochum.de/themes/custom/rub/l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ruhr-uni-bochum.de/themes/custom/rub/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 466 KB
0 oversized -0 KB
3 legacy format
2 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

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
582ms total JS execution
REVIEW
582ms total JS execution
Info::
https://www.ruhr-uni-bochum.de/de: 223ms CPU time
Info::
Unattributable: 138ms CPU time
Info::
https://www.ruhr-uni-bochum.de/sites/default/files...: 113ms CPU time
Info::
https://video.ruhr-uni-bochum.de/js/mediaEmbed.js....: 107ms CPU time
Warning::
Third-party scripts: 582ms (100% of total)

Main Thread Breakdown

Other 38% Script Evaluation 31% Style & Layout 18% Rendering 7% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://www.ruhr-uni-bochum.de/de223ms5ms0ms3rd
Unattributable138ms6ms0ms3rd
https://www.ruhr-uni-bochum.de/sites/default/files/js/js_04Vs-H9jK7kZ8dPGYnFdD2qpd6T7EjOn7yu_Mi3R6Oo.js?scope=footer&delta=1&language=de&theme=rub&include=eJxtiEEOwyAMBD-E4idFJlklFgYjwFGe39JWPeWyMzvwdTNLgjdyVeGygfAQA-6hUhLtzSvr8rthTvVWrYOkyAiZh2WjL0LzSJE7pqyHWmSliJMvMW_9Uy_ZYfS3F5-nOZ0113ms82ms7ms3rd
https://video.ruhr-uni-bochum.de/js/mediaEmbed.js.php107ms65ms4ms3rd
C
JS Bundles
Action
8 scripts, 170 KB unused
REVIEW
8 scripts, 170 KB unused
Warning::
https://www.ruhr-uni-bochum.de/sites/default/files...: 63 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ruhr-uni-bochum.de/sites/default/files...: 54 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://statistic.ruhr-uni-bochum.de/matomo.js: 30 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://video.ruhr-uni-bochum.de/js/mediaEmbed.js....: 23 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 170 KB
170 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ruhr-uni-bochum.de/sites/default/files/js/js_04Vs-H9jK7kZ8dPGYnFdD2qpd6T7EjOn7yu_Mi3R6Oo.js?scope=footer&delta=1&language=de&theme=rub&include=eJxtiEEOwyAMBD-E4idFJlklFgYjwFGe39JWPeWyMzvwdTNLgjdyVeGygfAQA-6hUhLtzSvr8rthTvVWrYOkyAiZh2WjL0LzSJE7pqyHWmSliJMvMW_9Uy_ZYfS3F5-nOZ0140 KB63 KB (45%)✓3rd
https://www.ruhr-uni-bochum.de/sites/default/files/js/js_Or69rxs_88oGVinF3LTmYord3SV3R6sh16BzCKx44oQ.js?scope=footer&delta=3&language=de&theme=rub&include=eJxtiEEOwyAMBD-E4idFJlklFgYjwFGe39JWPeWyMzvwdTNLgjdyVeGygfAQA-6hUhLtzSvr8rthTvVWrYOkyAiZh2WjL0LzSJE7pqyHWmSliJMvMW_9Uy_ZYfS3F5-nOZ096 KB54 KB (57%)✓3rd
https://statistic.ruhr-uni-bochum.de/matomo.js45 KB30 KB (67%)✓3rd
https://video.ruhr-uni-bochum.de/js/mediaEmbed.js.php54 KB23 KB (43%)✓3rd
https://www.ruhr-uni-bochum.de/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.01 KB—✓3rd
https://www.ruhr-uni-bochum.de/sites/default/files/js/js_EUCNs45PTfsdslOEV9ZTS1ILgIWPLKxHZ1Z9L9lurG4.js?scope=footer&delta=5&language=de&theme=rub&include=eJxtiEEOwyAMBD-E4idFJlklFgYjwFGe39JWPeWyMzvwdTNLgjdyVeGygfAQA-6hUhLtzSvr8rthTvVWrYOkyAiZh2WjL0LzSJE7pqyHWmSliJMvMW_9Uy_ZYfS3F5-nOZ02 KB—✓3rd
https://www.ruhr-uni-bochum.de/themes/custom/rub/dist/lib/modernizr.custom.min.js?v=3.3.14 KB—✓3rd
blob:https://www.ruhr-uni-bochum.de/c1bcbdec-24f2-4c91-8230-9da8531301d7-0 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

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
12 fonts (230 KB)
PASS
12 fonts (230 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

230 KB total

Render-blocking

0

of 12

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 500 ms LCP 1.9 shttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/flamapro-basic.woffflamapro-basic.woff https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/flamapro-basic.woff — 32.6 KiB — 78 ms — font-display: swaphttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/rub-web-icons.woffrub-web-icons.woff https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/rub-web-icons.woff — 9.8 KiB — 103 ms — font-display: swaphttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/FlamaPro-Medium.woffFlamaPro-Medium.woff https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/FlamaPro-Medium.woff — 32.4 KiB — 124 ms — font-display: swaphttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/f6dc818d-560b-492b-8a95-e5fb445c15cf.woff2f6dc818d-560b-492b-8a95... https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/f6dc818d-560b-492b-8a95-e5fb445c15cf.woff2 — 32.1 KiB — 125 ms — font-display: swaphttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/610a9c94-45a4-4549-81df-a9307ddfd949.woff2610a9c94-45a4-4549-81df... https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/610a9c94-45a4-4549-81df-a9307ddfd949.woff2 — 35.1 KiB — 126 ms — font-display: swaphttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/6a92fda6-9e6d-40b9-a93a-37e712a64599.woff26a92fda6-9e6d-40b9-a93a... https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/6a92fda6-9e6d-40b9-a93a-37e712a64599.woff2 — 31.2 KiB — 126 ms — font-display: swaphttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/Flama-Basic-A.woffFlama-Basic-A.woff https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/Flama-Basic-A.woff — 46.8 KiB — 106 ms — font-display: swaphttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/FlamaPro-Medium.woffFlamaPro-Medium.woff https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/FlamaPro-Medium.woff — 0 B — 2 ms — font-display: swaphttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/flamapro-basic.woffflamapro-basic.woff https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/flamapro-basic.woff — 0 B — 2 ms — font-display: swaphttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/f6dc818d-560b-492b-8a95-e5fb445c15cf.woff2f6dc818d-560b-492b-8a95... https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/f6dc818d-560b-492b-8a95-e5fb445c15cf.woff2 — 0 B — 2 ms — font-display: swaphttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/Flama-Basic-A.woffFlama-Basic-A.woff https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/Flama-Basic-A.woff — 0 B — 2 ms — font-display: swaphttps://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/rub-web-icons.woff?v=2rub-web-icons.woff https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/rub-web-icons.woff?v=2 — 9.8 KiB — 42 ms — font-display: swap
flamapro-basic.woff woff swap
Size 33 KB
Load time 78 ms
Start 321 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
rub-web-icons.woff woff swap
Size 10 KB
Load time 103 ms
Start 323 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
FlamaPro-Medium.woff woff swap
Size 32 KB
Load time 124 ms
Start 323 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
f6dc818d-560b-492b-8a95... woff2 swap
Size 32 KB
Load time 125 ms
Start 324 ms
Risk FOUT — text flashes from fallback to web font
610a9c94-45a4-4549-81df... woff2 swap
Size 35 KB
Load time 126 ms
Start 324 ms
Risk FOUT — text flashes from fallback to web font
6a92fda6-9e6d-40b9-a93a... woff2 swap
Size 31 KB
Load time 126 ms
Start 324 ms
Risk FOUT — text flashes from fallback to web font
Flama-Basic-A.woff woff swap
Size 47 KB
Load time 106 ms
Start 325 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
FlamaPro-Medium.woff woff swap
Size 0 KB
Load time 2 ms
Start 708 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
flamapro-basic.woff woff swap
Size 0 KB
Load time 2 ms
Start 710 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
f6dc818d-560b-492b-8a95... woff2 swap
Size 0 KB
Load time 2 ms
Start 710 ms
Risk FOUT — text flashes from fallback to web font
Flama-Basic-A.woff woff swap
Size 0 KB
Load time 2 ms
Start 713 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
rub-web-icons.woff woff swap
Size 10 KB
Load time 42 ms
Start 741 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 ~39 KB and ~78 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
60 requests over 6465ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 500 ms LCP 1.9 shttps://ruhr-uni-bochum.de// https://ruhr-uni-bochum.de/ — 301 — 144 B — 150 ms — http/1.0https://www.ruhr-uni-bochum.de/dewww.ruhr-uni-bochum.de/de https://www.ruhr-uni-bochum.de/de — 200 — 25.7 KiB — 188 ms — http/1.1https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/flamapro-basic.woffwww.ruhr-uni-bochum.de/themes/custo... https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/flamapro-basic.woff — 200 — 32.6 KiB — 78 ms — http/1.1https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/rub-web-icons.woffwww.ruhr-uni-bochum.de/themes/custo... https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/rub-web-icons.woff — 200 — 9.8 KiB — 103 ms — http/1.1https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/FlamaPro-Medium.woffwww.ruhr-uni-bochum.de/themes/custo... https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/FlamaPro-Medium.woff — 200 — 32.4 KiB — 124 ms — http/1.1https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/f6dc818d-560b-492b-8a95-e5fb445c15cf.woff2www.ruhr-uni-bochum.de/themes/custo... https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/f6dc818d-560b-492b-8a95-e5fb445c15cf.woff2 — 200 — 32.1 KiB — 125 ms — http/1.1https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/610a9c94-45a4-4549-81df-a9307ddfd949.woff2www.ruhr-uni-bochum.de/themes/custo... https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/610a9c94-45a4-4549-81df-a9307ddfd949.woff2 — 200 — 35.1 KiB — 126 ms — http/1.1https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/6a92fda6-9e6d-40b9-a93a-37e712a64599.woff2www.ruhr-uni-bochum.de/themes/custo... https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/6a92fda6-9e6d-40b9-a93a-37e712a64599.woff2 — 200 — 31.2 KiB — 126 ms — http/1.1https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/Flama-Basic-A.woffwww.ruhr-uni-bochum.de/themes/custo... https://www.ruhr-uni-bochum.de/themes/custom/rub/fonts/Flama-Basic-A.woff — 200 — 46.8 KiB — 106 ms — http/1.1https://statistic.ruhr-uni-bochum.de/matomo.jsstatistic.ruhr-uni-bochum.de/matomo... https://statistic.ruhr-uni-bochum.de/matomo.js — 200 — 45.4 KiB — 274 ms — http/1.1https://www.ruhr-uni-bochum.de/sites/default/files/styles/1260x840/public/2021-01/studium_und_lehre_km-176.jpg.webp?h=51a72048&itok=XdRKT3Emwww.ruhr-uni-bochum.de/sites/defaul... https://www.ruhr-uni-bochum.de/sites/default/files/styles/1260x840/public/2021-01/studium_und_lehre_km-176.jpg.webp?h=51a72048&itok=XdRKT3Em — 200 — 120.2 KiB — 202 ms — http/1.1https://www.ruhr-uni-bochum.de/sites/default/files/js/js_04Vs-H9jK7kZ8dPGYnFdD2qpd6T7EjOn7yu_Mi3R6Oo.js?scope=footer&delta=1&language=de&theme=rub&include=eJxtiEEOwyAMBD-E4idFJlklFgYjwFGe39JWPeWyMzvwdTNLgjdyVeGygfAQA-6hUhLtzSvr8rthTvVWrYOkyAiZh2WjL0LzSJE7pqyHWmSliJMvMW_9Uy_ZYfS3F5-nOZ0www.ruhr-uni-bochum.de/sites/defaul... 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https://video.ruhr-uni-bochum.de/media/hlsMedium/key/364a3d63c2374aca9b97c93a5d51fb68/format/default/ext/mp4/learning/0/path/364a3d63c2374aca9b97c93a5d51fb68_1756724585_mp4_002.ts?&jsEmbedUserInfo=1f8KDOnaUgxaYRAos8T3oS6Zhi76To6wShKCANjjlPPcG0udFocu5rniO2Rj8tbt — 200 — 565.0 KiB — 473 ms — h2https://video.ruhr-uni-bochum.de/media/hlsMedium/key/364a3d63c2374aca9b97c93a5d51fb68/format/default/ext/mp4/learning/0/path/364a3d63c2374aca9b97c93a5d51fb68_1756724585_mp4_003.ts?&jsEmbedUserInfo=1f8KDOnaUgxaYRAos8T3oS6Zhi76To6wShKCANjjlPPcG0udFocu5rniO2Rj8tbtvideo.ruhr-uni-bochum.de/media/hlsM... https://video.ruhr-uni-bochum.de/media/hlsMedium/key/364a3d63c2374aca9b97c93a5d51fb68/format/default/ext/mp4/learning/0/path/364a3d63c2374aca9b97c93a5d51fb68_1756724585_mp4_003.ts?&jsEmbedUserInfo=1f8KDOnaUgxaYRAos8T3oS6Zhi76To6wShKCANjjlPPcG0udFocu5rniO2Rj8tbt — 200 — 698.3 KiB — 486 ms — h2https://video.ruhr-uni-bochum.de/media/hlsMedium/key/364a3d63c2374aca9b97c93a5d51fb68/format/default/ext/mp4/learning/0/path/364a3d63c2374aca9b97c93a5d51fb68_1756724585_mp4_004.ts?&jsEmbedUserInfo=1f8KDOnaUgxaYRAos8T3oS6Zhi76To6wShKCANjjlPPcG0udFocu5rniO2Rj8tbtvideo.ruhr-uni-bochum.de/media/hlsM... https://video.ruhr-uni-bochum.de/media/hlsMedium/key/364a3d63c2374aca9b97c93a5d51fb68/format/default/ext/mp4/learning/0/path/364a3d63c2374aca9b97c93a5d51fb68_1756724585_mp4_004.ts?&jsEmbedUserInfo=1f8KDOnaUgxaYRAos8T3oS6Zhi76To6wShKCANjjlPPcG0udFocu5rniO2Rj8tbt — 200 — 907.7 KiB — 439 ms — h2https://video.ruhr-uni-bochum.de/media/hlsMedium/key/364a3d63c2374aca9b97c93a5d51fb68/format/default/ext/mp4/learning/0/path/364a3d63c2374aca9b97c93a5d51fb68_1756724585_mp4_005.ts?&jsEmbedUserInfo=1f8KDOnaUgxaYRAos8T3oS6Zhi76To6wShKCANjjlPPcG0udFocu5rniO2Rj8tbtvideo.ruhr-uni-bochum.de/media/hlsM... https://video.ruhr-uni-bochum.de/media/hlsMedium/key/364a3d63c2374aca9b97c93a5d51fb68/format/default/ext/mp4/learning/0/path/364a3d63c2374aca9b97c93a5d51fb68_1756724585_mp4_005.ts?&jsEmbedUserInfo=1f8KDOnaUgxaYRAos8T3oS6Zhi76To6wShKCANjjlPPcG0udFocu5rniO2Rj8tbt — 200 — 374.6 KiB — 431 ms — h2https://video.ruhr-uni-bochum.de/media/hlsMedium/key/364a3d63c2374aca9b97c93a5d51fb68/format/default/ext/mp4/learning/0/path/364a3d63c2374aca9b97c93a5d51fb68_1756724585_mp4_006.ts?&jsEmbedUserInfo=1f8KDOnaUgxaYRAos8T3oS6Zhi76To6wShKCANjjlPPcG0udFocu5rniO2Rj8tbtvideo.ruhr-uni-bochum.de/media/hlsM... https://video.ruhr-uni-bochum.de/media/hlsMedium/key/364a3d63c2374aca9b97c93a5d51fb68/format/default/ext/mp4/learning/0/path/364a3d63c2374aca9b97c93a5d51fb68_1756724585_mp4_006.ts?&jsEmbedUserInfo=1f8KDOnaUgxaYRAos8T3oS6Zhi76To6wShKCANjjlPPcG0udFocu5rniO2Rj8tbt — 200 — 725.7 KiB — 486 ms — h2https://video.ruhr-uni-bochum.de/media/hlsMedium/key/364a3d63c2374aca9b97c93a5d51fb68/format/default/ext/mp4/learning/0/path/364a3d63c2374aca9b97c93a5d51fb68_1756724585_mp4_007.ts?&jsEmbedUserInfo=1f8KDOnaUgxaYRAos8T3oS6Zhi76To6wShKCANjjlPPcG0udFocu5rniO2Rj8tbtvideo.ruhr-uni-bochum.de/media/hlsM... https://video.ruhr-uni-bochum.de/media/hlsMedium/key/364a3d63c2374aca9b97c93a5d51fb68/format/default/ext/mp4/learning/0/path/364a3d63c2374aca9b97c93a5d51fb68_1756724585_mp4_007.ts?&jsEmbedUserInfo=1f8KDOnaUgxaYRAos8T3oS6Zhi76To6wShKCANjjlPPcG0udFocu5rniO2Rj8tbt — 200 — 148.5 KiB — 438 ms — h2
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 582ms · 219KB · €6/mo
www.ruhr-uni-bochum.de
Other
Costly
Execution 223ms
Transfer 26 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 138ms
Transfer 0 KB
Monthly Cost €2/mo
www.ruhr-uni-bochum.de
Other
Optional
Execution 113ms
Transfer 140 KB
Unused 45%
Monthly Cost €1/mo
video.ruhr-uni-bochum.de
Other
Optional
Execution 107ms
Transfer 54 KB
Unused 43%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.ruhr-uni-bochum.de 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.ruhr-uni-bochum.de 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

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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