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https://uni-hamburg.de

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
54
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

3.75 s

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

7.24 s

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

158 ms

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

0.208

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

4.87 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.

8.29 s

Page Load Progression

482 ms
965 ms
1.4 s
1.9 s
2.4 s
2.9 s
3.4 s
3.9 s
Checks
17
7 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
3.3 MB transferred, 44 requests
FIX
3.3 MB transferred, 44 requests
Warning::
Page weighs 4.5 MB (3.3 MB transferred)
Info::
Fonts are 392 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 392 KB
Info::
44 HTTP requests
Info::
Estimated 0.69 g CO2 per page load
3.3 MB / 2.4 MB budget
3.3 MB transferred
44 requests
0.69 g CO2 per page load
Other 2.0 MiB 62%
Images 512.0 KiB 15%
Fonts 391.6 KiB 12%
JavaScript 242.1 KiB 7%
CSS 115.7 KiB 3%
HTML 15.1 KiB 0%
Other 2.4 KiB 0%
Other 1.7 KiB 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 (3.3 MiB of 3.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
44 resources · 3.3 MB · 141 KB savings available
FIX
44 resources · 3.3 MB · 141 KB savings available
Warning::
Page weight 2.3 MB over 1MB target
Got: 3.3 MB Expected: ≤ 1 MB
Info::
~141 KB of savings available
Warning::
43 third-party resources (100% of weight)
Info::
2 resources over 200KB
44 resources · 3.3 MiB · 43 third-party 2.3 MiB over 1MB target
Media 62% · 2.0 MiB
Image 15% · 513.9 KiB
Font 12% · 391.6 KiB
JavaScript 7% · 242.1 KiB
CSS 3% · 115.7 KiB
Document 0% · 15.4 KiB
Other 0% · 1.9 KiB

~141.1 KiB of savings available

Remove unused JavaScript: 141.1 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
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Info::
All images are well-optimized
23 images 512 KB
0 oversized -0 KB
17 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1681ms total JS execution
REVIEW
1681ms total JS execution
Warning::
https://assets.rrz.uni-hamburg.de/assets/2-a25a64b...: 736ms CPU time
Warning::
Unattributable: 495ms CPU time
Warning::
https://www.uni-hamburg.de/: 357ms CPU time
Info::
https://code.etracker.com/code/e.js: 93ms CPU time
Warning::
Third-party scripts: 1681ms (100% of total)

Main Thread Breakdown

Other 32% Script Evaluation 30% Style & Layout 26% Script Parsing & Compilation 5% Parse HTML & CSS 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://assets.rrz.uni-hamburg.de/assets/2-a25a64b8ef71e4d939753923135383c905c3d9038fbbae14392eb09165a1bd56.js736ms386ms67ms3rd
Unattributable495ms12ms0ms3rd
https://www.uni-hamburg.de/357ms18ms4ms3rd
https://code.etracker.com/code/e.js93ms81ms10ms3rd
B
JS Bundles
5 scripts, 141 KB unused
REVIEW
5 scripts, 141 KB unused
Warning::
https://assets.rrz.uni-hamburg.de/assets/2-a25a64b...: 141 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 141 KB
141 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets.rrz.uni-hamburg.de/assets/2-a25a64b8ef71e4d939753923135383c905c3d9038fbbae14392eb09165a1bd56.js200 KB141 KB (71%)✓3rd
https://www.betterweb.uni-hamburg.de/web/rum.js7 KB—✓3rd
https://code.etracker.com/code/e.js31 KB—✓3rd
https://code.etracker.com/t.js?v=ee485f6&et=OBVZu94 KB—✓3rd
https://www.etracker.de/cntcc?&&et=OBVZu9&v=6.0&tc=17768094375937&pagename=https%3A%2F%2Fwww.uni-hamburg.de%2F&ilevel=1&et_source_url=https%3A%2F%2Fwww.uni-hamburg.de%2F&cc_ordercurr=EUR&cc_ordertype=lead&cc_baskettype=basket&block_cookies=true&respect_dnt=true&et_bs=1&code_source=%2F%2Fcode.etracker.com%2Fcode%2Fe.js&code_async=true&page_id=809437382&et_sbscr=0&coid=760faff8ab9e6cc18fb74a507dc012d9&et_cblk=1&et_cd=www.uni-hamburg.de&dh=YoFjh86e0p3X7X09QboCFkHptcUxgg0P&clt=240 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
6 fonts (392 KB)
PASS
6 fonts (392 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

392 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.7 s LCP 7.2 shttps://assets.rrz.uni-hamburg.de/assets/TheSansUHHSemiLightCaps-32ba22c7d79fd9bb62f6fdc072fb890589bf54d6665920f1c24590c325a3239b.woff2TheSansUHHSemiLightCaps... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHSemiLightCaps-32ba22c7d79fd9bb62f6fdc072fb890589bf54d6665920f1c24590c325a3239b.woff2 — 27.3 KiB — 185 ms — font-display: swaphttps://assets.rrz.uni-hamburg.de/assets/TheSansUHHBold-7bc7a19f2f859b122f413c47ab20a3459e68b5484d4e41852c867e1af7fdb23f.woff2TheSansUHHBold-7bc7a19f... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHBold-7bc7a19f2f859b122f413c47ab20a3459e68b5484d4e41852c867e1af7fdb23f.woff2 — 122.0 KiB — 270 ms — font-display: swaphttps://assets.rrz.uni-hamburg.de/assets/TheSansUHHBoldCaps-e693e29862e9a63c8fcda7276514608cf455cb6db1c1d5ba18a5cbbafdb8453b.woff2TheSansUHHBoldCaps-e693... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHBoldCaps-e693e29862e9a63c8fcda7276514608cf455cb6db1c1d5ba18a5cbbafdb8453b.woff2 — 27.2 KiB — 197 ms — font-display: swaphttps://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegular-d12c570fcf82daa59706e8bc063b08989230fd572b48d91d4ce4766d6399e157.woff2TheSansUHHRegular-d12c5... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegular-d12c570fcf82daa59706e8bc063b08989230fd572b48d91d4ce4766d6399e157.woff2 — 120.6 KiB — 285 ms — font-display: swaphttps://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegularCaps-2b6f7440c42c3e72ad537b81477bb606ae8e63b48872d6bd715b19a5a7811ba7.woff2TheSansUHHRegularCaps-2... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegularCaps-2b6f7440c42c3e72ad537b81477bb606ae8e63b48872d6bd715b19a5a7811ba7.woff2 — 27.2 KiB — 236 ms — font-display: swaphttps://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegularItalic-d6fab6cd19bfdef91af497a14e0f55591960c719c1e743956e22524fbdff953d.woff2TheSansUHHRegularItalic... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegularItalic-d6fab6cd19bfdef91af497a14e0f55591960c719c1e743956e22524fbdff953d.woff2 — 67.4 KiB — 276 ms — font-display: swap
TheSansUHHSemiLightCaps... woff2 swap
Size 27 KB
Load time 185 ms
Start 684 ms
Risk FOUT — text flashes from fallback to web font
TheSansUHHBold-7bc7a19f... woff2 swap
Size 122 KB
Load time 270 ms
Start 684 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
TheSansUHHBoldCaps-e693... woff2 swap
Size 27 KB
Load time 197 ms
Start 685 ms
Risk FOUT — text flashes from fallback to web font
TheSansUHHRegular-d12c5... woff2 swap
Size 121 KB
Load time 285 ms
Start 685 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
TheSansUHHRegularCaps-2... woff2 swap
Size 27 KB
Load time 236 ms
Start 685 ms
Risk FOUT — text flashes from fallback to web font
TheSansUHHRegularItalic... woff2 swap
Size 67 KB
Load time 276 ms
Start 685 ms
Risk FOUT — text flashes from fallback to web font
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 ~121 KB and ~242 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
—
preload
7
dns-prefetch
—
prefetch
—

7 resource hints configured

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
44 requests over 2005ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.7 s LCP 7.2 shttps://uni-hamburg.de// https://uni-hamburg.de/ — 301 — 264 B — 108 ms — http/1.1https://www.uni-hamburg.de/www.uni-hamburg.de/ https://www.uni-hamburg.de/ — 200 — 15.1 KiB — 594 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/1-c670d8a09aff9f71bb6aade2b7335870af7a2f2b07e35098dbdeaaf0203eff87.cssassets.rrz.uni-hamburg.de/assets/1-... https://assets.rrz.uni-hamburg.de/assets/1-c670d8a09aff9f71bb6aade2b7335870af7a2f2b07e35098dbdeaaf0203eff87.css — 200 — 59.7 KiB — 224 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/2-5c32f29283efecd70d560dff3d70febb1cb5a2277638619db21c0150e60ababf.cssassets.rrz.uni-hamburg.de/assets/2-... https://assets.rrz.uni-hamburg.de/assets/2-5c32f29283efecd70d560dff3d70febb1cb5a2277638619db21c0150e60ababf.css — 200 — 54.2 KiB — 261 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/print-85727ed44b77df53ff88b8a79482dc1ba86ec114c0f78c348368e4be1d7acaee.cssassets.rrz.uni-hamburg.de/assets/pr... https://assets.rrz.uni-hamburg.de/assets/print-85727ed44b77df53ff88b8a79482dc1ba86ec114c0f78c348368e4be1d7acaee.css — 200 — 1.8 KiB — 296 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/2-a25a64b8ef71e4d939753923135383c905c3d9038fbbae14392eb09165a1bd56.jsassets.rrz.uni-hamburg.de/assets/2-... https://assets.rrz.uni-hamburg.de/assets/2-a25a64b8ef71e4d939753923135383c905c3d9038fbbae14392eb09165a1bd56.js — 200 — 199.8 KiB — 364 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/TheSansUHHSemiLightCaps-32ba22c7d79fd9bb62f6fdc072fb890589bf54d6665920f1c24590c325a3239b.woff2assets.rrz.uni-hamburg.de/assets/Th... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHSemiLightCaps-32ba22c7d79fd9bb62f6fdc072fb890589bf54d6665920f1c24590c325a3239b.woff2 — 200 — 27.3 KiB — 185 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/TheSansUHHBold-7bc7a19f2f859b122f413c47ab20a3459e68b5484d4e41852c867e1af7fdb23f.woff2assets.rrz.uni-hamburg.de/assets/Th... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHBold-7bc7a19f2f859b122f413c47ab20a3459e68b5484d4e41852c867e1af7fdb23f.woff2 — 200 — 122.0 KiB — 270 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/TheSansUHHBoldCaps-e693e29862e9a63c8fcda7276514608cf455cb6db1c1d5ba18a5cbbafdb8453b.woff2assets.rrz.uni-hamburg.de/assets/Th... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHBoldCaps-e693e29862e9a63c8fcda7276514608cf455cb6db1c1d5ba18a5cbbafdb8453b.woff2 — 200 — 27.2 KiB — 197 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegular-d12c570fcf82daa59706e8bc063b08989230fd572b48d91d4ce4766d6399e157.woff2assets.rrz.uni-hamburg.de/assets/Th... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegular-d12c570fcf82daa59706e8bc063b08989230fd572b48d91d4ce4766d6399e157.woff2 — 200 — 120.6 KiB — 285 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegularCaps-2b6f7440c42c3e72ad537b81477bb606ae8e63b48872d6bd715b19a5a7811ba7.woff2assets.rrz.uni-hamburg.de/assets/Th... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegularCaps-2b6f7440c42c3e72ad537b81477bb606ae8e63b48872d6bd715b19a5a7811ba7.woff2 — 200 — 27.2 KiB — 236 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegularItalic-d6fab6cd19bfdef91af497a14e0f55591960c719c1e743956e22524fbdff953d.woff2assets.rrz.uni-hamburg.de/assets/Th... https://assets.rrz.uni-hamburg.de/assets/TheSansUHHRegularItalic-d6fab6cd19bfdef91af497a14e0f55591960c719c1e743956e22524fbdff953d.woff2 — 200 — 67.4 KiB — 276 ms — http/1.1https://www.uni-hamburg.de/25056460/video-startseite-0dadc40703e9c8ae96b427e9fdcc7655d49dfb94.jpgwww.uni-hamburg.de/25056460/video-s... https://www.uni-hamburg.de/25056460/video-startseite-0dadc40703e9c8ae96b427e9fdcc7655d49dfb94.jpg — 200 — 207.3 KiB — 174 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/uhh-logo-16dab7756eecc70a7649a242498868c6bb37872e5eae6023b38026faeef923c3.svgassets.rrz.uni-hamburg.de/assets/uh... https://assets.rrz.uni-hamburg.de/assets/uhh-logo-16dab7756eecc70a7649a242498868c6bb37872e5eae6023b38026faeef923c3.svg — 200 — 4.3 KiB — 119 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/placeholder-5c5fc8f0915b6ab9ac0e253dfdb9636831107395cc7f6ef1015a902c4f0fa964.svgassets.rrz.uni-hamburg.de/assets/pl... https://assets.rrz.uni-hamburg.de/assets/placeholder-5c5fc8f0915b6ab9ac0e253dfdb9636831107395cc7f6ef1015a902c4f0fa964.svg — 200 — 458 B — 125 ms — http/1.1https://www.betterweb.uni-hamburg.de/web/rum.jswww.betterweb.uni-hamburg.de/web/ru... https://www.betterweb.uni-hamburg.de/web/rum.js — 200 — 6.5 KiB — 284 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/hamburger-b3b3524203bc7ee7181ac8d2ba6c2ef9a8ee80845dbb53f02fbf6a207c6cae12.svgassets.rrz.uni-hamburg.de/assets/ha... https://assets.rrz.uni-hamburg.de/assets/hamburger-b3b3524203bc7ee7181ac8d2ba6c2ef9a8ee80845dbb53f02fbf6a207c6cae12.svg — 200 — 771 B — 38 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/Gebaerdensprache-2277df00776f836f68b0d845a8826d84e945b792c7ac9f4c346dedfd9d8c222d.svgassets.rrz.uni-hamburg.de/assets/Ge... https://assets.rrz.uni-hamburg.de/assets/Gebaerdensprache-2277df00776f836f68b0d845a8826d84e945b792c7ac9f4c346dedfd9d8c222d.svg — 200 — 15.8 KiB — 68 ms — http/1.1https://assets.rrz.uni-hamburg.de/assets/LeichteSprache-fcaa2f75603dcdd10d4c642230761008c826800ef9c220dd99045bf96f2a8220.svgassets.rrz.uni-hamburg.de/assets/Le... https://assets.rrz.uni-hamburg.de/assets/LeichteSprache-fcaa2f75603dcdd10d4c642230761008c826800ef9c220dd99045bf96f2a8220.svg — 200 — 834 B — 37 ms — http/1.1data:image/svg+xml,%3Csvg%20width%3D%22957%22%20height%3D%22695%22%20viewBox%3D%220%200%20957%20695…data:image/svg+xml,%3Csvg%20width%3... 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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 1681ms · 246KB · €18/mo
assets.rrz.uni-hamburg.de
Other
Costly
Execution 736ms
Transfer 200 KB
Unused 71%
Monthly Cost €8/mo
Unattributable
Other
Costly
Execution 495ms
Transfer 0 KB
Monthly Cost €5/mo
www.uni-hamburg.de
Other
Costly
Execution 357ms
Transfer 15 KB
Monthly Cost €4/mo
code.etracker.com
Other
Optional
Execution 93ms
Transfer 31 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • assets.rrz.uni-hamburg.de adds 736ms and costs ~€8/month
  • Unattributable adds 495ms and costs ~€5/month
  • www.uni-hamburg.de adds 357ms 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.

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

Source: web.dev

assets.rrz.uni-hamburg.de takes 736ms 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

71% of assets.rrz.uni-hamburg.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

Unattributable takes 495ms 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-hamburg.de takes 357ms 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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