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https://tu-dresden.de

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
0
REVIEW
6
PASS
9
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
78
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

3.21 s

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

6.80 s

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

290 ms

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

0.001

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

5.04 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.

6.86 s

Page Load Progression

404 ms
808 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
17
9 PASS 6 REVIEW
B
Page Weight Budget
1.5 MB transferred, 41 requests
REVIEW
1.5 MB transferred, 41 requests
Info::
Page weighs 2.3 MB (1.5 MB transferred)
Info::
41 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
41 requests
0.31 g CO2 per page load
Images 1014.0 KiB 66%
JavaScript 274.8 KiB 18%
Fonts 113.1 KiB 7%
CSS 61.9 KiB 4%
Other 30.8 KiB 2%
HTML 17.0 KiB 1%
Other 15.7 KiB 1%
Other 1.5 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit
C
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://tu-dresden.de/ressourcen/bilder/startseite... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/ressourcen/bilder/buehne/exz... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/tu-dresden/newsportal/ressou... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/ressourcen/bilder/buehne/exz... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/++theme++tud.theme.webcms2/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/ressourcen/bilder/buehne/exz... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/ressourcen/bilder/buehne/exz... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/tu-dresden/newsportal/ressou... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/med/mf/ressourcen/bilder/new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/++theme++tud.theme.webcms2/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/++theme++tud.theme.webcms2/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/ressourcen/bilder/buehne/exz... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://tu-dresden.de/++theme++tud.theme.webcms2/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 1014 KB
0 oversized -0 KB
21 legacy format
13 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

C
JS Execution Cost
Action
1811ms total JS execution
REVIEW
1811ms total JS execution
Warning::
https://tu-dresden.de/++plone++production/++unique...: 951ms CPU time
Warning::
https://tu-dresden.de/: 523ms CPU time
Warning::
Unattributable: 337ms CPU time
Info::
Third-party scripts: 337ms (19% of total)

Main Thread Breakdown

Script Evaluation 34% Style & Layout 27% Other 26% Rendering 6% Parse HTML & CSS 4% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://tu-dresden.de/++plone++production/++unique++2026-03-30T14:52:00.121084/default.js951ms551ms51ms1st
https://tu-dresden.de/523ms9ms2ms1st
Unattributable337ms41ms0ms3rd
B
JS Bundles
4 scripts, 116 KB unused
REVIEW
4 scripts, 116 KB unused
Warning::
https://tu-dresden.de/++plone++production/++unique...: 79 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tu-dresden.de/++plone++production/++unique...: unminified — 26 KB could be saved
Warning::
https://matomo.tu-dresden.de/matomo.js: 38 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 116 KB
116 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://tu-dresden.de/++plone++production/++unique++2026-03-30T14:52:00.121084/default.js203 KB79 KB (39%)✗1st
https://matomo.tu-dresden.de/matomo.js67 KB38 KB (57%)✓3rd
https://tu-dresden.de/++plone++static/++unique++2024-11-11%2023%3A39%3A45.815496/plone-legacy-compiled.js4 KB—✓1st
https://tu-dresden.de/++plone++tud.addons.webcms/mockup/translate-catalog.js2 KB—✓1st

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
Page Weight Inventory
Action
41 resources · 1.5 MB · 116 KB savings available
REVIEW
41 resources · 1.5 MB · 116 KB savings available
Warning::
Page weight 505 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~116 KB of savings available
Info::
3 third-party resources (4% of weight)
Info::
2 resources over 200KB
41 resources · 1.5 MiB · 3 third-party 504.8 KiB over 1MB target
Image 67% · 1.0 MiB
JavaScript 18% · 274.8 KiB
Font 7% · 113.1 KiB
CSS 4% · 61.9 KiB
Other 2% · 32.8 KiB
Document 1% · 17.0 KiB

~116.5 KiB of savings available

Remove unused JavaScript: 116.5 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
4% third-party, 0 ms blocking
PASS
4% third-party, 0 ms blocking
Info::
Third-party code accounts for 4% of page weight (66.7 KiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
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
5 fonts (113 KB)
PASS
5 fonts (113 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

113 KB total

Render-blocking

0

of 5

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 3.2 s LCP 6.8 shttps://tu-dresden.de/++theme++tud.theme.webcms2/fonts/OpenSans/opensans-regular.woff2opensans-regular.woff2 https://tu-dresden.de/++theme++tud.theme.webcms2/fonts/OpenSans/opensans-regular.woff2 — 17.0 KiB — 1.4 s — font-display: swaphttps://tu-dresden.de/++theme++tud.theme.webcms2/fonts/OpenSans/opensans-bold.woff2opensans-bold.woff2 https://tu-dresden.de/++theme++tud.theme.webcms2/fonts/OpenSans/opensans-bold.woff2 — 17.6 KiB — 1.4 s — font-display: swaphttps://tu-dresden.de/++theme++tud.theme.webcms2/fonts/tud-icons.woff?6886tud-icons.woff https://tu-dresden.de/++theme++tud.theme.webcms2/fonts/tud-icons.woff?6886 — 43.0 KiB — 1.5 s — font-display: swaphttps://tu-dresden.de/++theme++tud.theme.webcms2/fonts/OpenSans/opensans-semibold.woff2opensans-semibold.woff2 https://tu-dresden.de/++theme++tud.theme.webcms2/fonts/OpenSans/opensans-semibold.woff2 — 17.7 KiB — 1.5 s — font-display: swaphttps://tu-dresden.de/++theme++tud.theme.webcms2/fonts/OpenSans/opensans-light.woff2opensans-light.woff2 https://tu-dresden.de/++theme++tud.theme.webcms2/fonts/OpenSans/opensans-light.woff2 — 17.9 KiB — 1.6 s — font-display: swap
opensans-regular.woff2 woff2 swap
Size 17 KB
Load time 1.4 s
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
opensans-bold.woff2 woff2 swap
Size 18 KB
Load time 1.4 s
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
tud-icons.woff woff swap
Size 43 KB
Load time 1.5 s
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
opensans-semibold.woff2 woff2 swap
Size 18 KB
Load time 1.5 s
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
opensans-light.woff2 woff2 swap
Size 18 KB
Load time 1.6 s
Start 1.1 s
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 ~13 KB and ~26 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
A
HTTP Caching
max-age=60 (1 minute)
PASS
max-age=60 (1 minute)
Info::
Cache-Control header is set
Got: max-age=60, s-maxage=0, public
Info::
Effective TTL: 1 minute (max-age=60)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=60, s-maxage=0, public

DirectiveValueMeaning
max-age60Cache for 1 minute
s-maxage0CDN caches for 0 seconds
public—Any cache may store this response
Effective TTL: 60 seconds
Network Waterfall
41 requests over 3177ms
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 3.2 s LCP 6.8 shttps://tu-dresden.de// https://tu-dresden.de/ — 200 — 17.0 KiB — 123 ms — h2https://tu-dresden.de/++plone++production/++unique++2026-03-30T14:52:00.121084/default.css/++plone++production/++unique++2026... https://tu-dresden.de/++plone++production/++unique++2026-03-30T14:52:00.121084/default.css — 200 — 1.9 KiB — 44 ms — h2https://tu-dresden.de/++theme++tud.theme.webcms2/css/common.css?version=None/++theme++tud.theme.webcms2/css/com... https://tu-dresden.de/++theme++tud.theme.webcms2/css/common.css?version=None — 200 — 58.9 KiB — 220 ms — h2https://tu-dresden.de/++plone++static/++unique++2024-11-11%2023%3A39%3A45.815496/plone-legacy-compiled.css/++plone++static/++unique++2024-11-... https://tu-dresden.de/++plone++static/++unique++2024-11-11%2023%3A39%3A45.815496/plone-legacy-compiled.css — 200 — 1.1 KiB — 257 ms — h2https://tu-dresden.de/++plone++production/++unique++2026-03-30T14:52:00.121084/default.js/++plone++production/++unique++2026... https://tu-dresden.de/++plone++production/++unique++2026-03-30T14:52:00.121084/default.js — 200 — 202.5 KiB — 865 ms — h2https://tu-dresden.de/++plone++static/++unique++2024-11-11%2023%3A39%3A45.815496/plone-legacy-compiled.js/++plone++static/++unique++2024-11-... https://tu-dresden.de/++plone++static/++unique++2024-11-11%2023%3A39%3A45.815496/plone-legacy-compiled.js — 200 — 3.6 KiB — 255 ms — h2https://tu-dresden.de/++theme++tud.theme.webcms2/img/tud-logo-white-en-2025-v2.svg/++theme++tud.theme.webcms2/img/tud... https://tu-dresden.de/++theme++tud.theme.webcms2/img/tud-logo-white-en-2025-v2.svg — 200 — 8.9 KiB — 258 ms — h2https://tu-dresden.de/ressourcen/bilder/startseite/Stills-00_00_00_02-Still003.jpg/@@images/4c0a08cc-d553-41b6-bc67-c13ff2df395a.jpeg/ressourcen/bilder/startseite/Still... https://tu-dresden.de/ressourcen/bilder/startseite/Stills-00_00_00_02-Still003.jpg/@@images/4c0a08cc-d553-41b6-bc67-c13ff2df395a.jpeg — 200 — 35.5 KiB — 864 ms — h2https://tu-dresden.de/ressourcen/bilder/buehne/exzellenz/roboter-sinfonie/@@images/0a17a7f9-7ff5-4e9f-addb-1899839d976c.jpeg/ressourcen/bilder/buehne/exzellenz... https://tu-dresden.de/ressourcen/bilder/buehne/exzellenz/roboter-sinfonie/@@images/0a17a7f9-7ff5-4e9f-addb-1899839d976c.jpeg — 200 — 42.7 KiB — 708 ms — h2https://tu-dresden.de/ressourcen/bilder/buehne/exzellenz/rec2_pixelwg_Joerg-Bandmann.jpg/@@images/40424fad-ae7c-4ff2-8cf4-b57649a23949.jpeg/ressourcen/bilder/buehne/exzellenz... https://tu-dresden.de/ressourcen/bilder/buehne/exzellenz/rec2_pixelwg_Joerg-Bandmann.jpg/@@images/40424fad-ae7c-4ff2-8cf4-b57649a23949.jpeg — 200 — 41.4 KiB — 182 ms — h2https://tu-dresden.de/ressourcen/bilder/buehne/exzellenz/areas-of-excellence-clusterskizzen/CARE2_TUD-TD.png/@@images/f7176705-538e-4cdf-9305-df26d64d326e.png/ressourcen/bilder/buehne/exzellenz... https://tu-dresden.de/ressourcen/bilder/buehne/exzellenz/areas-of-excellence-clusterskizzen/CARE2_TUD-TD.png/@@images/f7176705-538e-4cdf-9305-df26d64d326e.png — 200 — 250.0 KiB — 922 ms — h2https://tu-dresden.de/ressourcen/bilder/buehne/exzellenz/bilder-der-exc/ct.qmat/Oberflaechen-Exzitonen_BildThinkDesignJochenThamm.jpg/@@images/b6b23a63-8b09-4f1e-999d-229106c81db8.jpeg/ressourcen/bilder/buehne/exzellenz... https://tu-dresden.de/ressourcen/bilder/buehne/exzellenz/bilder-der-exc/ct.qmat/Oberflaechen-Exzitonen_BildThinkDesignJochenThamm.jpg/@@images/b6b23a63-8b09-4f1e-999d-229106c81db8.jpeg — 200 — 59.0 KiB — 1.2 s — h2https://tu-dresden.de/ressourcen/bilder/buehne/exzellenz/bilder-der-exc/pol/190122_Kachel_Forschung_PoL_960x540.jpg/@@images/292e35e5-3d0b-4c63-a9fb-4e12cffbe9ef.jpeg/ressourcen/bilder/buehne/exzellenz... https://tu-dresden.de/ressourcen/bilder/buehne/exzellenz/bilder-der-exc/pol/190122_Kachel_Forschung_PoL_960x540.jpg/@@images/292e35e5-3d0b-4c63-a9fb-4e12cffbe9ef.jpeg — 200 — 47.0 KiB — 1.1 s — h2https://tu-dresden.de/tu-dresden/newsportal/ressourcen/bilder/news-bilder/fotos-2026/Saechsische-Akademie.jpg/@@images/4f65f768-9f21-4784-ac08-a76714835b6f.jpeg/tu-dresden/newsportal/ressourcen/b... https://tu-dresden.de/tu-dresden/newsportal/ressourcen/bilder/news-bilder/fotos-2026/Saechsische-Akademie.jpg/@@images/4f65f768-9f21-4784-ac08-a76714835b6f.jpeg — 200 — 30.7 KiB — 316 ms — h2https://tu-dresden.de/tu-dresden/newsportal/ressourcen/bilder/news-bilder/fotos-2026/halbleiterprobe/@@images/1f003e18-96e6-440e-a500-2b8619feec3b.jpeg/tu-dresden/newsportal/ressourcen/b... https://tu-dresden.de/tu-dresden/newsportal/ressourcen/bilder/news-bilder/fotos-2026/halbleiterprobe/@@images/1f003e18-96e6-440e-a500-2b8619feec3b.jpeg — 200 — 25.2 KiB — 565 ms — h2https://tu-dresden.de/med/mf/ressourcen/bilder/news/2026/Mi2.jpg/@@images/09ef84ad-74cf-4f94-873c-04f611d28512.jpeg/med/mf/ressourcen/bilder/news/2026... https://tu-dresden.de/med/mf/ressourcen/bilder/news/2026/Mi2.jpg/@@images/09ef84ad-74cf-4f94-873c-04f611d28512.jpeg — 200 — 39.9 KiB — 994 ms — h2https://tu-dresden.de/ressourcen/bilder/startseite/Logo_SCS_bunt.png/@@images/e9bd7728-c1b0-483e-9d69-20ffe6ae76f1.png/ressourcen/bilder/startseite/Logo_... https://tu-dresden.de/ressourcen/bilder/startseite/Logo_SCS_bunt.png/@@images/e9bd7728-c1b0-483e-9d69-20ffe6ae76f1.png — 200 — 19.3 KiB — 492 ms — h2https://tu-dresden.de/++theme++tud.theme.webcms2/img/tud_claim_2025.svg/++theme++tud.theme.webcms2/img/tud... https://tu-dresden.de/++theme++tud.theme.webcms2/img/tud_claim_2025.svg — 200 — 13.6 KiB — 1.2 s — 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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
19% of JavaScript execution is third-party
First-party Third-party 337ms · 0KB · €4/mo
Unattributable
Other
Costly
Execution 337ms
Transfer 0 KB
Monthly Cost €4/mo

These scripts may cost more than they're worth

  • Unattributable adds 337ms and costs ~€4/month

Unattributable takes 337ms 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

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