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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
55
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.
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.

4.65 s

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

7.28 s

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

278 ms

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

0.056

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

6.77 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.

7.33 s

Page Load Progression

389 ms
777 ms
1.2 s
1.6 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
17
8 PASS 4 REVIEW 3 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.3 MiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
40 resources · 1.3 MB · 241 KB savings available
FIX
40 resources · 1.3 MB · 241 KB savings available
Warning::
Page weight 340 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~241 KB of savings available
Warning::
39 third-party resources (100% of weight)
Info::
2 resources over 200KB
40 resources · 1.3 MiB · 39 third-party 340.1 KiB over 1MB target
JavaScript 34% · 467.0 KiB
Image 30% · 404.5 KiB
Font 28% · 382.5 KiB
CSS 6% · 75.5 KiB
Document 2% · 34.0 KiB
Other 0% · 609 B

~240.8 KiB of savings available

Remove unused JavaScript: 240.8 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
Page Weight Budget
1.3 MB transferred, 40 requests
REVIEW
1.3 MB transferred, 40 requests
Info::
Page weighs 3.6 MB (1.3 MB transferred)
Info::
Fonts are 382 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 382 KB
Info::
40 HTTP requests
Info::
Estimated 0.28 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
40 requests
0.28 g CO2 per page load
JavaScript 467.0 KiB 34%
Images 403.1 KiB 30%
Fonts 382.5 KiB 28%
CSS 75.5 KiB 6%
HTML 33.8 KiB 2%
Other 1.7 KiB 0%
Other 596 B 0%
Other 13 B 0%
0 2.4 MB 4.9 MB
Under 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

C
JS Execution Cost
Action
1591ms total JS execution
REVIEW
1591ms total JS execution
Warning::
https://www.tuwien.at/typo3temp/assets/compressed/...: 714ms CPU time
Warning::
https://www.tuwien.at/_assets/3b1e37ddfca841316c0d...: 365ms CPU time
Info::
https://www.tuwien.at/: 190ms CPU time
Info::
Unattributable: 178ms CPU time
Info::
https://www.tuwien.at/_assets/3b1e37ddfca841316c0d...: 83ms CPU time
Warning::
Third-party scripts: 1591ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 26% Style & Layout 14% Script Parsing & Compilation 10% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.tuwien.at/typo3temp/assets/compressed/merged-39380130e3fb2cb55ca14450d13de211-5deb289b162241aec02eed23dade928d.js?1776686753714ms324ms52ms3rd
https://www.tuwien.at/_assets/3b1e37ddfca841316c0d227c9c4c4020/mathjax3/tex-chtml.js?1741600490365ms269ms94ms3rd
https://www.tuwien.at/190ms13ms1ms3rd
Unattributable178ms4ms0ms3rd
https://www.tuwien.at/_assets/3b1e37ddfca841316c0d227c9c4c4020/Js/lazyload.min.js?174160049083ms43ms2ms3rd
https://www.tuwien.at/typo3temp/assets/compressed/Form.min-ca35b8f900e790a5ec0adedd29e38d54.js?174160268861ms47ms7ms3rd
C
JS Bundles
Action
5 scripts, 241 KB unused
REVIEW
5 scripts, 241 KB unused
Warning::
https://www.tuwien.at/_assets/3b1e37ddfca841316c0d...: 125 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.tuwien.at/typo3temp/assets/compressed/...: 116 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 241 KB
241 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.tuwien.at/_assets/3b1e37ddfca841316c0d227c9c4c4020/mathjax3/tex-chtml.js?1741600490258 KB125 KB (49%)✓3rd
https://www.tuwien.at/typo3temp/assets/compressed/merged-39380130e3fb2cb55ca14450d13de211-5deb289b162241aec02eed23dade928d.js?1776686753169 KB116 KB (69%)✓3rd
https://www.tuwien.at/_assets/3b1e37ddfca841316c0d227c9c4c4020/Js/lazyload.min.js?174160049010 KB—✓3rd
https://www.tuwien.at/typo3temp/assets/compressed/merged-4e9768f205972950b49abcf8b057b514-13870e0375ddc0f728881ee62fdc772c.js?17416026886 KB—✓3rd
https://www.tuwien.at/typo3temp/assets/compressed/Form.min-ca35b8f900e790a5ec0adedd29e38d54.js?174160268824 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

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+
Image Optimization
11 images, 0 KB saveable
PASS
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 403 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
7 fonts (382 KB)
PASS
7 fonts (382 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

382 KB total

Render-blocking

0

of 7

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 4.6 s LCP 7.3 shttps://www.tuwien.at/resources/fonts/Roboto/Regular/Roboto-Regular.woff2Roboto-Regular.woff2 https://www.tuwien.at/resources/fonts/Roboto/Regular/Roboto-Regular.woff2 — 63.5 KiB — 100 ms — font-display: swaphttps://www.tuwien.at/resources/fonts/Roboto/Light/Roboto-Light.woff2Roboto-Light.woff2 https://www.tuwien.at/resources/fonts/Roboto/Light/Roboto-Light.woff2 — 63.2 KiB — 174 ms — font-display: swaphttps://www.tuwien.at/resources/fonts/Roboto/LightItalic/Roboto-LightItalic.woff2Roboto-LightItalic.woff2 https://www.tuwien.at/resources/fonts/Roboto/LightItalic/Roboto-LightItalic.woff2 — 69.5 KiB — 139 ms — font-display: swaphttps://www.tuwien.at/resources/fonts/Roboto/Bold/Roboto-Bold.woff2Roboto-Bold.woff2 https://www.tuwien.at/resources/fonts/Roboto/Bold/Roboto-Bold.woff2 — 63.6 KiB — 100 ms — font-display: swaphttps://www.tuwien.at/resources/fonts/PTSans/Bold/pt-sans-v12-latin-ext-700.woff2pt-sans-v12-latin-ext-7... https://www.tuwien.at/resources/fonts/PTSans/Bold/pt-sans-v12-latin-ext-700.woff2 — 60.3 KiB — 136 ms — font-display: swaphttps://www.tuwien.at/resources/fonts/PTSans/Regular/pt-sans-v12-latin-ext-regular.woff2pt-sans-v12-latin-ext-r... https://www.tuwien.at/resources/fonts/PTSans/Regular/pt-sans-v12-latin-ext-regular.woff2 — 57.0 KiB — 173 ms — font-display: swaphttps://www.tuwien.at/resources/fonts/TuWienIcons/tuwien-icons.ttf?1763412710tuwien-icons.ttf https://www.tuwien.at/resources/fonts/TuWienIcons/tuwien-icons.ttf?1763412710 — 5.3 KiB — 41 ms — font-display: swap
Roboto-Regular.woff2 woff2 swap
Size 64 KB
Load time 100 ms
Start 370 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Light.woff2 woff2 swap
Size 63 KB
Load time 174 ms
Start 371 ms
Risk FOUT — text flashes from fallback to web font
Roboto-LightItalic.woff2 woff2 swap
Size 69 KB
Load time 139 ms
Start 371 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Bold.woff2 woff2 swap
Size 64 KB
Load time 100 ms
Start 372 ms
Risk FOUT — text flashes from fallback to web font
pt-sans-v12-latin-ext-7... woff2 swap
Size 60 KB
Load time 136 ms
Start 372 ms
Risk FOUT — text flashes from fallback to web font
pt-sans-v12-latin-ext-r... woff2 swap
Size 57 KB
Load time 173 ms
Start 372 ms
Risk FOUT — text flashes from fallback to web font
tuwien-icons.ttf ttf swap
Size 5 KB
Load time 41 ms
Start 755 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 ~2 KB and ~4 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
—
prefetch
—

6 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
40 requests over 2977ms
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 4.6 s LCP 7.3 shttps://tuwien.ac.at// https://tuwien.ac.at/ — 301 — 261 B — 129 ms — h2https://www.tuwien.at/www.tuwien.at/ https://www.tuwien.at/ — 200 — 33.8 KiB — 267 ms — h2https://www.tuwien.at/resources/fonts/Roboto/Regular/Roboto-Regular.woff2www.tuwien.at/resources/fonts/Robot... https://www.tuwien.at/resources/fonts/Roboto/Regular/Roboto-Regular.woff2 — 200 — 63.5 KiB — 100 ms — h2https://www.tuwien.at/resources/fonts/Roboto/Light/Roboto-Light.woff2www.tuwien.at/resources/fonts/Robot... https://www.tuwien.at/resources/fonts/Roboto/Light/Roboto-Light.woff2 — 200 — 63.2 KiB — 174 ms — h2https://www.tuwien.at/resources/fonts/Roboto/LightItalic/Roboto-LightItalic.woff2www.tuwien.at/resources/fonts/Robot... https://www.tuwien.at/resources/fonts/Roboto/LightItalic/Roboto-LightItalic.woff2 — 200 — 69.5 KiB — 139 ms — h2https://www.tuwien.at/resources/fonts/Roboto/Bold/Roboto-Bold.woff2www.tuwien.at/resources/fonts/Robot... https://www.tuwien.at/resources/fonts/Roboto/Bold/Roboto-Bold.woff2 — 200 — 63.6 KiB — 100 ms — h2https://www.tuwien.at/resources/fonts/PTSans/Bold/pt-sans-v12-latin-ext-700.woff2www.tuwien.at/resources/fonts/PTSan... https://www.tuwien.at/resources/fonts/PTSans/Bold/pt-sans-v12-latin-ext-700.woff2 — 200 — 60.3 KiB — 136 ms — h2https://www.tuwien.at/resources/fonts/PTSans/Regular/pt-sans-v12-latin-ext-regular.woff2www.tuwien.at/resources/fonts/PTSan... https://www.tuwien.at/resources/fonts/PTSans/Regular/pt-sans-v12-latin-ext-regular.woff2 — 200 — 57.0 KiB — 173 ms — h2https://www.tuwien.at/typo3temp/assets/compressed/merged-d628bb01eaf254b65cc60878511ac745-41ab452e3ddb09a641792790a1adda5e.css?1776255489www.tuwien.at/typo3temp/assets/comp... https://www.tuwien.at/typo3temp/assets/compressed/merged-d628bb01eaf254b65cc60878511ac745-41ab452e3ddb09a641792790a1adda5e.css?1776255489 — 200 — 74.3 KiB — 178 ms — h2https://www.tuwien.at/_assets/f6ef6adaf5c92bf687a31a3adbcb0f7b/Css/news-basic.css?1731661375www.tuwien.at/_assets/f6ef6adaf5c92... https://www.tuwien.at/_assets/f6ef6adaf5c92bf687a31a3adbcb0f7b/Css/news-basic.css?1731661375 — 200 — 1.2 KiB — 112 ms — h2https://www.tuwien.at/_assets/3b1e37ddfca841316c0d227c9c4c4020/Js/lazyload.min.js?1741600490www.tuwien.at/_assets/3b1e37ddfca84... https://www.tuwien.at/_assets/3b1e37ddfca841316c0d227c9c4c4020/Js/lazyload.min.js?1741600490 — 200 — 9.7 KiB — 140 ms — h2https://www.tuwien.at/typo3temp/assets/compressed/merged-4e9768f205972950b49abcf8b057b514-13870e0375ddc0f728881ee62fdc772c.js?1741602688www.tuwien.at/typo3temp/assets/comp... https://www.tuwien.at/typo3temp/assets/compressed/merged-4e9768f205972950b49abcf8b057b514-13870e0375ddc0f728881ee62fdc772c.js?1741602688 — 200 — 6.4 KiB — 138 ms — h2https://www.tuwien.at/typo3temp/assets/compressed/merged-39380130e3fb2cb55ca14450d13de211-5deb289b162241aec02eed23dade928d.js?1776686753www.tuwien.at/typo3temp/assets/comp... https://www.tuwien.at/typo3temp/assets/compressed/merged-39380130e3fb2cb55ca14450d13de211-5deb289b162241aec02eed23dade928d.js?1776686753 — 200 — 168.5 KiB — 186 ms — h2https://www.tuwien.at/_assets/3b1e37ddfca841316c0d227c9c4c4020/mathjax3/tex-chtml.js?1741600490www.tuwien.at/_assets/3b1e37ddfca84... https://www.tuwien.at/_assets/3b1e37ddfca841316c0d227c9c4c4020/mathjax3/tex-chtml.js?1741600490 — 200 — 258.1 KiB — 189 ms — h2https://www.tuwien.at/fileadmin/_processed_/f/8/csm_WACA_Badge_Silver_RGB_Rand_3719cb0b69.jpgwww.tuwien.at/fileadmin/_processed_... https://www.tuwien.at/fileadmin/_processed_/f/8/csm_WACA_Badge_Silver_RGB_Rand_3719cb0b69.jpg — 200 — 1.4 KiB — 44 ms — h2https://www.tuwien.at/typo3temp/assets/compressed/Form.min-ca35b8f900e790a5ec0adedd29e38d54.js?1741602688www.tuwien.at/typo3temp/assets/comp... https://www.tuwien.at/typo3temp/assets/compressed/Form.min-ca35b8f900e790a5ec0adedd29e38d54.js?1741602688 — 200 — 24.2 KiB — 46 ms — h2data:image/jpg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUF…data:image/jpg;base64,/9j/4AAQSkZJR... data:image/jpg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUF… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAANCAIAAAAmMtkJAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAC4…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAANCAIAAAAmMtkJAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAC4… — 200 — 0 B — 0 ms — datadata:image/jpg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUF…data:image/jpg;base64,/9j/4AAQSkZJR... 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datadata:image/jpg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUF…data:image/jpg;base64,/9j/4AAQSkZJR... data:image/jpg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUF… — 200 — 0 B — 0 ms — datadata:image/jpg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUF…data:image/jpg;base64,/9j/4AAQSkZJR... data:image/jpg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUF… — 200 — 0 B — 0 ms — datadata:image/jpg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUF…data:image/jpg;base64,/9j/4AAQSkZJR... data:image/jpg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUF… — 200 — 0 B — 0 ms — datadata:image/jpg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUF…data:image/jpg;base64,/9j/4AAQSkZJR... 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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 1591ms · 494KB · €17/mo
www.tuwien.at
Other
Costly
Execution 714ms
Transfer 169 KB
Unused 69%
Monthly Cost €8/mo
www.tuwien.at
Other
Costly
Execution 365ms
Transfer 258 KB
Unused 49%
Monthly Cost €4/mo
www.tuwien.at
Other
Optional
Execution 190ms
Transfer 34 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 178ms
Transfer 0 KB
Monthly Cost €2/mo
www.tuwien.at
Other
Optional
Execution 83ms
Transfer 10 KB
Monthly Cost €1/mo
www.tuwien.at
Other
Optional
Execution 61ms
Transfer 24 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.tuwien.at adds 714ms and costs ~€8/month
  • www.tuwien.at adds 365ms and costs ~€4/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

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

Source: web.dev

www.tuwien.at takes 714ms 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

69% of www.tuwien.at'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

www.tuwien.at takes 365ms 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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