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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
31
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.

11.56 s

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

18.64 s

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

76 ms

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

0.764

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

11.56 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.

45.42 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
F
Page Weight Budget
Action
12.4 MB transferred, 63 requests
FIX
12.4 MB transferred, 63 requests
Critical::
Page weighs 12.4 MB (12.4 MB transferred)
Warning::
Images are 10.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 10.1 MB
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
CSS is 571 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 571 KB
Info::
Fonts are 349 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 349 KB
Info::
63 HTTP requests
Info::
Estimated 2.6 g CO2 per page load
12.4 MB / 2.4 MB budget
12.4 MB transferred
63 requests
2.6 g CO2 per page load
Images 10.1 MiB 82%
JavaScript 1.3 MiB 10%
CSS 570.5 KiB 5%
Fonts 349.1 KiB 3%
HTML 121.3 KiB 1%
Other 2.1 KiB 0%
Other 755 B 0%
Other 219 B 0%
0 2.4 MB 4.9 MB
Over 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

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

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 (12.4 MiB of 12.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
11 scripts, 930 KB unused
FIX
11 scripts, 930 KB unused
Warning::
https://www.uni-stuttgart.de/system/modules/de.stu...: 460 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uni-stuttgart.de/system/modules/de.stu...: 210 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uni-stuttgart.de/system/modules/de.stu...: 97 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uni-stuttgart.de/system/modules/de.stu...: 67 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uni-stuttgart.de/system/modules/de.stu...: 53 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 930 KB
930 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.zsb/resources/videointerview/js/dash.all.min.js572 KB460 KB (80%)✓3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/jquery-ui/jquery-ui-1.11.4.min.js235 KB210 KB (89%)✓3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/aperto-bootstrap-ie-workaround.js130 KB97 KB (74%)✓3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/bootstrap.js121 KB67 KB (55%)✓3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/fancybox/jquery.fancybox357.min.js67 KB53 KB (79%)✓3rd
https://www.uni-stuttgart.de/piwik/piwik.js68 KB45 KB (66%)✓3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/tik.js19 KB—✗3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.filters/resources/js/filters.js6 KB—✗3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/tippy-popper/popper.min.js18 KB—✓3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/tippy-popper/tippy.min.js24 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
63 resources · 12.4 MB · 930 KB savings available
FIX
63 resources · 12.4 MB · 930 KB savings available
Warning::
Page weight 11.4 MB over 1MB target
Got: 12.4 MB Expected: ≤ 1 MB
Info::
~930 KB of savings available
Warning::
62 third-party resources (100% of weight)
Info::
16 resources over 200KB
63 resources · 12.4 MiB · 62 third-party 11.4 MiB over 1MB target
Image 82% · 10.1 MiB
JavaScript 10% · 1.3 MiB
CSS 5% · 570.5 KiB
Font 3% · 349.1 KiB
Document 1% · 121.8 KiB
Other 0% · 974 B

~930.4 KiB of savings available

Remove unused JavaScript: 930.4 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: max-age=0, no-cache, no-store, must-revalidate, private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-cache, no-store, must-revalidate, private

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
no-store—Never cache this response
must-revalidate—Must recheck with server after expiry
private—Only browser cache, not CDN/proxy
C
Image Optimization
Action
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Warning::
https://www.uni-stuttgart.de/system/modules/de.stu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/universitaet/aktuelle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/universitaet/aktuelle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/universitaet/aktuelle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.intcdc.uni-stuttgart.de/img/news/news-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.zlw.uni-stuttgart.de/dokumente/Gestwa-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/forschung/img/profilb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/universitaet/aktuelle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/universitaet/aktuelle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/universitaet/aktuelle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/studium/orientierung/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/universitaet/aktuelle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/universitaet/fueralle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/universitaet/aktuelle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uni-stuttgart.de/universitaet/aktuelle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
34 images 10.1 MB
0 oversized -0 KB
34 legacy format
15 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

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

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

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

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

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

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

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
JS Execution Cost
Action
1559ms total JS execution
REVIEW
1559ms total JS execution
Warning::
https://www.uni-stuttgart.de/: 584ms CPU time
Warning::
Unattributable: 410ms CPU time
Warning::
https://www.uni-stuttgart.de/system/modules/de.stu...: 262ms CPU time
Info::
https://www.uni-stuttgart.de/system/modules/de.stu...: 91ms CPU time
Info::
https://www.uni-stuttgart.de/system/modules/de.stu...: 81ms CPU time
Warning::
Third-party scripts: 1559ms (100% of total)

Main Thread Breakdown

Other 40% Style & Layout 22% Script Evaluation 19% Rendering 9% Script Parsing & Compilation 6% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.uni-stuttgart.de/584ms4ms1ms3rd
Unattributable410ms5ms0ms3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/bootstrap.js262ms151ms9ms3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.zsb/resources/videointerview/js/dash.all.min.js91ms43ms48ms3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/aperto-bootstrap-ie-workaround.js81ms11ms9ms3rd
https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/jquery-ui/jquery-ui-1.11.4.min.js68ms32ms17ms3rd
https://www.uni-stuttgart.de/piwik/piwik.js63ms57ms5ms3rd
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
2 fonts (349 KB)
PASS
2 fonts (349 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

349 KB total

Render-blocking

0

of 2

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 18.0 s FCP 11.6 s LCP 18.6 shttps://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/fonts/uni-stuttgart-sans/Uni-Stuttgart-Sans-Light.woff2Uni-Stuttgart-Sans-Ligh... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/fonts/uni-stuttgart-sans/Uni-Stuttgart-Sans-Light.woff2 — 175.7 KiB — 269 ms — font-display: swaphttps://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/fonts/uni-stuttgart-sans/Uni-Stuttgart-Sans-Bold.woff2Uni-Stuttgart-Sans-Bold... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/fonts/uni-stuttgart-sans/Uni-Stuttgart-Sans-Bold.woff2 — 173.4 KiB — 273 ms — font-display: swap
Uni-Stuttgart-Sans-Ligh... woff2 swap
Size 176 KB
Load time 269 ms
Start 839 ms
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
Uni-Stuttgart-Sans-Bold... woff2 swap
Size 173 KB
Load time 273 ms
Start 839 ms
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
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 ~175 KB and ~350 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
63 requests over 1468ms
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 18.0 s FCP 11.6 s LCP 18.6 shttps://uni-stuttgart.de// https://uni-stuttgart.de/ — 302 — 505 B — 107 ms — http/1.1https://www.uni-stuttgart.de/www.uni-stuttgart.de/ https://www.uni-stuttgart.de/ — 200 — 121.3 KiB — 479 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/styles.csswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/styles.css — 200 — 324.4 KiB — 158 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/tik.csswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/tik.css — 200 — 172.4 KiB — 144 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/jquery-ui/jquery-ui-1.11.4.min.csswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/jquery-ui/jquery-ui-1.11.4.min.css — 200 — 29.4 KiB — 103 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/fancybox/jquery.fancybox357.min.csswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/fancybox/jquery.fancybox357.min.css — 200 — 12.7 KiB — 47 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/footer/footer.csswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/footer/footer.css — 200 — 5.6 KiB — 73 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/linkgruppen/linkgruppen.csswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/linkgruppen/linkgruppen.css — 200 — 11.2 KiB — 73 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/zielgruppen/zielgruppen.csswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/css/zielgruppen/zielgruppen.css — 200 — 3.8 KiB — 102 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/bootstrap.jswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/bootstrap.js — 200 — 121.0 KiB — 134 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/aperto-bootstrap-ie-workaround.jswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/aperto-bootstrap-ie-workaround.js — 200 — 130.2 KiB — 139 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/tik.jswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/tik.js — 200 — 19.3 KiB — 105 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/jquery-ui/jquery-ui-1.11.4.min.jswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/jquery-ui/jquery-ui-1.11.4.min.js — 200 — 235.0 KiB — 157 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.filters/resources/js/filters.jswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.filters/resources/js/filters.js — 200 — 6.2 KiB — 107 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/fancybox/jquery.fancybox357.min.jswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/fancybox/jquery.fancybox357.min.js — 200 — 66.8 KiB — 128 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/tippy-popper/popper.min.jswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/tippy-popper/popper.min.js — 200 — 18.2 KiB — 128 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/tippy-popper/tippy.min.jswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/tippy-popper/tippy.min.js — 200 — 23.6 KiB — 129 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.zsb/resources/videointerview/js/dash.all.min.jswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.zsb/resources/videointerview/js/dash.all.min.js — 200 — 572.0 KiB — 164 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/img/svg/logo-start-de.svgwww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/img/svg/logo-start-de.svg — 200 — 17.1 KiB — 130 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/img/svg/logo-start-inverted-de.svgwww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/img/svg/logo-start-inverted-de.svg — 200 — 17.3 KiB — 130 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/img/svg/logo-de.svgwww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/img/svg/logo-de.svg — 200 — 17.0 KiB — 33 ms — 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h2https://www.zlw.uni-stuttgart.de/dokumente/Gestwa-Klaus-006-Feb-2024.jpg?__scale=w:1110,h:1110,cx:590,cy:0,cw:2362,ch:2362www.zlw.uni-stuttgart.de/dokumente/... https://www.zlw.uni-stuttgart.de/dokumente/Gestwa-Klaus-006-Feb-2024.jpg?__scale=w:1110,h:1110,cx:590,cy:0,cw:2362,ch:2362 — 200 — 259.2 KiB — 599 ms — h2https://www.uni-stuttgart.de/forschung/img/profilbild-aerospace-technologies.jpg?__scale=w:740,h:740,cx:642,cy:0,cw:2555,ch:2555www.uni-stuttgart.de/forschung/img/... https://www.uni-stuttgart.de/forschung/img/profilbild-aerospace-technologies.jpg?__scale=w:740,h:740,cx:642,cy:0,cw:2555,ch:2555 — 200 — 142.3 KiB — 372 ms — h2https://www.uni-stuttgart.de/universitaet/aktuelles/img-news/01_07-RH3076-0036.jpg?__scale=w:740,h:740,cx:240,cy:0,cw:1500,ch:1500www.uni-stuttgart.de/universitaet/a... https://www.uni-stuttgart.de/universitaet/aktuelles/img-news/01_07-RH3076-0036.jpg?__scale=w:740,h:740,cx:240,cy:0,cw:1500,ch:1500 — 200 — 173.0 KiB — 420 ms — h2https://www.uni-stuttgart.de/forschung/forschung-leben/11-2018/img_112018/Bild5.jpg?__scale=w:740,h:740,cx:0,cy:0,cw:1051,ch:1051www.uni-stuttgart.de/forschung/fors... https://www.uni-stuttgart.de/forschung/forschung-leben/11-2018/img_112018/Bild5.jpg?__scale=w:740,h:740,cx:0,cy:0,cw:1051,ch:1051 — 200 — 264.2 KiB — 434 ms — h2https://www.uni-stuttgart.de/.uni/hkom/forschung/img/digit.jpg?__scale=w:740,h:740,cx:1079,cy:0,cw:2507,ch:2507www.uni-stuttgart.de/.uni/hkom/fors... https://www.uni-stuttgart.de/.uni/hkom/forschung/img/digit.jpg?__scale=w:740,h:740,cx:1079,cy:0,cw:2507,ch:2507 — 200 — 89.9 KiB — 399 ms — h2https://www.uni-stuttgart.de/forschung/profil/img/technik-und-wissenschaft-news-03-25-erf-2-fraesroboter-holzverarbeitung-universitaet-stuttgart-isw.jpg?__scale=w:740,h:740,cx:640,cy:0,cw:2560,ch:2560www.uni-stuttgart.de/forschung/prof... https://www.uni-stuttgart.de/forschung/profil/img/technik-und-wissenschaft-news-03-25-erf-2-fraesroboter-holzverarbeitung-universitaet-stuttgart-isw.jpg?__scale=w:740,h:740,cx:640,cy:0,cw:2560,ch:2560 — 200 — 158.5 KiB — 387 ms — h2https://www.uni-stuttgart.de/forschung/profil/img/diamant-quantentechnologie.jpg?__scale=w:740,h:740,cx:332,cy:0,cw:1335,ch:1335www.uni-stuttgart.de/forschung/prof... https://www.uni-stuttgart.de/forschung/profil/img/diamant-quantentechnologie.jpg?__scale=w:740,h:740,cx:332,cy:0,cw:1335,ch:1335 — 200 — 62.5 KiB — 390 ms — h2https://www.uni-stuttgart.de/forschung/profil/img/simulation-der-wirbelbildung.jpg?__scale=w:740,h:740,cx:302,cy:0,cw:775,ch:775www.uni-stuttgart.de/forschung/prof... https://www.uni-stuttgart.de/forschung/profil/img/simulation-der-wirbelbildung.jpg?__scale=w:740,h:740,cx:302,cy:0,cw:775,ch:775 — 200 — 227.5 KiB — 422 ms — h2https://www.uni-stuttgart.de/universitaet/aktuelles/img-news/News-10-24-Nature-DNA-Printing-Arizona-States-University-Jason-Drees.png?__scale=w:640,h:640,cx:420,cy:0,cw:1080,ch:1080www.uni-stuttgart.de/universitaet/a... https://www.uni-stuttgart.de/universitaet/aktuelles/img-news/News-10-24-Nature-DNA-Printing-Arizona-States-University-Jason-Drees.png?__scale=w:640,h:640,cx:420,cy:0,cw:1080,ch:1080 — 200 — 1.2 MiB — 514 ms — h2https://www.uni-stuttgart.de/universitaet/fueralle/img/mikro.png?__scale=w:640,h:640,cx:364,cy:0,cw:1620,ch:1620www.uni-stuttgart.de/universitaet/f... https://www.uni-stuttgart.de/universitaet/fueralle/img/mikro.png?__scale=w:640,h:640,cx:364,cy:0,cw:1620,ch:1620 — 200 — 1.6 MiB — 529 ms — h2https://www.uni-stuttgart.de/piwik/piwik.jswww.uni-stuttgart.de/piwik/piwik.js https://www.uni-stuttgart.de/piwik/piwik.js — 200 — 67.5 KiB — 317 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/login.mjswww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/js/login.mjs — 200 — 39.0 KiB — 334 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/img/sprites/sprites-icons-sprite.svgwww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/img/sprites/sprites-icons-sprite.svg — 200 — 77.6 KiB — 327 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/img/link-icons/ex-link-hover.pngwww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/img/link-icons/ex-link-hover.png — 200 — 497 B — 308 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/fonts/uni-stuttgart-sans/Uni-Stuttgart-Sans-Light.woff2www.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/fonts/uni-stuttgart-sans/Uni-Stuttgart-Sans-Light.woff2 — 200 — 175.7 KiB — 269 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/fonts/uni-stuttgart-sans/Uni-Stuttgart-Sans-Bold.woff2www.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/fonts/uni-stuttgart-sans/Uni-Stuttgart-Sans-Bold.woff2 — 200 — 173.4 KiB — 273 ms — h2https://www.uni-stuttgart.de/piwik/piwik.php?action_name=Universit%C3%A4t%20Stuttgart&idsite=72&rec=1&r=028805&h=23&m=42&s=23&url=https%3A%2F%2Fwww.uni-stuttgart.de%2F&_id=&_idts=1776814944&_idvc=1&_idn=1&_refts=0&_viewts=1776814944&send_image=1&cookie=0&pdf=1&qt=0&realp=0&wma=0&dir=0&fla=0&java=0&gears=0&ag=0&res=412x823&gt_ms=112&pv_id=kZ1Gfmwww.uni-stuttgart.de/piwik/piwik.ph... https://www.uni-stuttgart.de/piwik/piwik.php?action_name=Universit%C3%A4t%20Stuttgart&idsite=72&rec=1&r=028805&h=23&m=42&s=23&url=https%3A%2F%2Fwww.uni-stuttgart.de%2F&_id=&_idts=1776814944&_idvc=1&_idn=1&_refts=0&_viewts=1776814944&send_image=1&cookie=0&pdf=1&qt=0&realp=0&wma=0&dir=0&fla=0&java=0&gears=0&ag=0&res=412x823&gt_ms=112&pv_id=kZ1Gfm — 200 — 118 B — 191 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/elements/logindata.jsonwww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/elements/logindata.json — 200 — 219 B — 178 ms — h2https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/favicons/favicon-32x32.pngwww.uni-stuttgart.de/system/modules... https://www.uni-stuttgart.de/system/modules/de.stuttgart.uni.v3.basics/resources/favicons/favicon-32x32.png — 200 — 1.6 KiB — 31 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 1559ms · 1247KB · €17/mo
www.uni-stuttgart.de
Other
Costly
Execution 584ms
Transfer 121 KB
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 410ms
Transfer 0 KB
Monthly Cost €4/mo
www.uni-stuttgart.de
Other
Costly
Execution 262ms
Transfer 121 KB
Unused 55%
Monthly Cost €3/mo
www.uni-stuttgart.de
Other
Optional
Execution 91ms
Transfer 572 KB
Unused 80%
Monthly Cost €1/mo
www.uni-stuttgart.de
Other
Optional
Execution 81ms
Transfer 130 KB
Unused 74%
Monthly Cost €1/mo
www.uni-stuttgart.de
Other
Optional
Execution 68ms
Transfer 235 KB
Unused 89%
Monthly Cost €1/mo
www.uni-stuttgart.de
Other
Optional
Execution 63ms
Transfer 68 KB
Unused 66%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.uni-stuttgart.de adds 584ms and costs ~€6/month
  • Unattributable adds 410ms and costs ~€4/month
  • www.uni-stuttgart.de adds 262ms and costs ~€3/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-stuttgart.de takes 584ms 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 410ms 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

www.uni-stuttgart.de takes 262ms 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-stuttgart.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

80% of www.uni-stuttgart.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

74% of www.uni-stuttgart.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

89% of www.uni-stuttgart.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

66% of www.uni-stuttgart.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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