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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
93
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.

558 ms

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

1.50 s

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

20 ms

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

0.000

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

1.54 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.

1.52 s

Page Load Progression

392 ms
784 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.7 s
3.1 s
Checks
15
7 PASS 3 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 (1.8 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
42 resources · 1.8 MB · 240 KB savings available
FIX
42 resources · 1.8 MB · 240 KB savings available
Warning::
Page weight 816 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~240 KB of savings available
Warning::
41 third-party resources (100% of weight)
Info::
4 resources over 200KB
42 resources · 1.8 MiB · 41 third-party 815.7 KiB over 1MB target
Image 48% · 880.2 KiB
JavaScript 25% · 467.0 KiB
Font 21% · 382.5 KiB
CSS 4% · 75.5 KiB
Document 2% · 34.0 KiB
Other 0% · 609 B

~239.8 KiB of savings available

Remove unused JavaScript: 239.8 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.

C
Page Weight Budget
Action
1.8 MB transferred, 42 requests
REVIEW
1.8 MB transferred, 42 requests
Info::
Page weighs 4.0 MB (1.8 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::
42 HTTP requests
Info::
Estimated 0.38 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
42 requests
0.38 g CO2 per page load
Images 878.8 KiB 48%
JavaScript 467.0 KiB 25%
Fonts 382.5 KiB 21%
CSS 75.5 KiB 4%
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
Approaching limit

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 Bundles
Action
5 scripts, 240 KB unused
REVIEW
5 scripts, 240 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/...: 115 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 240 KB
240 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 KB115 KB (68%)✓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
13 images, 0 KB saveable
PASS
13 images, 0 KB saveable
Info::
All images are well-optimized
13 images 879 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
372ms total JS execution
PASS
372ms total JS execution
Info::
https://www.tuwien.at/typo3temp/assets/compressed/...: 195ms CPU time
Info::
https://www.tuwien.at/_assets/3b1e37ddfca841316c0d...: 91ms CPU time
Info::
https://www.tuwien.at/: 86ms CPU time
Warning::
Third-party scripts: 372ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 26% Style & Layout 15% Script Parsing & Compilation 9% Parse HTML & CSS 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.tuwien.at/typo3temp/assets/compressed/merged-39380130e3fb2cb55ca14450d13de211-5deb289b162241aec02eed23dade928d.js?1776686753195ms90ms14ms3rd
https://www.tuwien.at/_assets/3b1e37ddfca841316c0d227c9c4c4020/mathjax3/tex-chtml.js?174160049091ms66ms24ms3rd
https://www.tuwien.at/86ms4ms2ms3rd
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 500 ms 1.0 s 1.5 s FCP 558 ms LCP 1.5 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 — 172 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 — 173 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 — 172 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 — 171 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 — 170 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 — 171 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 — 45 ms — font-display: swap
Roboto-Regular.woff2 woff2 swap
Size 64 KB
Load time 172 ms
Start 336 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Light.woff2 woff2 swap
Size 63 KB
Load time 173 ms
Start 336 ms
Risk FOUT — text flashes from fallback to web font
Roboto-LightItalic.woff2 woff2 swap
Size 69 KB
Load time 172 ms
Start 337 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Bold.woff2 woff2 swap
Size 64 KB
Load time 171 ms
Start 337 ms
Risk FOUT — text flashes from fallback to web font
pt-sans-v12-latin-ext-7... woff2 swap
Size 60 KB
Load time 170 ms
Start 337 ms
Risk FOUT — text flashes from fallback to web font
pt-sans-v12-latin-ext-r... woff2 swap
Size 57 KB
Load time 171 ms
Start 337 ms
Risk FOUT — text flashes from fallback to web font
tuwien-icons.ttf ttf swap
Size 5 KB
Load time 45 ms
Start 592 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
42 requests over 2731ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 558 ms LCP 1.5 shttps://tuwien.ac.at// https://tuwien.ac.at/ — 301 — 261 B — 126 ms — h2https://www.tuwien.at/www.tuwien.at/ https://www.tuwien.at/ — 200 — 33.8 KiB — 239 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 — 172 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 — 173 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 — 172 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 — 171 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 — 170 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 — 171 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 — 184 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 — 49 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 — 174 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 — 172 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 — 168.6 KiB — 180 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 — 182 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 — 41 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 — 45 ms — h2https://www.tuwien.at/manifest.jsonwww.tuwien.at/manifest.json https://www.tuwien.at/manifest.json — 200 — 596 B — 123 ms — h2https://www.tuwien.at/resources/fonts/TuWienIcons/tuwien-icons.ttf?1763412710www.tuwien.at/resources/fonts/TuWie... https://www.tuwien.at/resources/fonts/TuWienIcons/tuwien-icons.ttf?1763412710 — 200 — 5.3 KiB — 45 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... 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/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAANCAIAAAAmMtkJAAAABGdBTUEAALGPC/xhBQAAAAFzUkdCA…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAANCAIAAAAmMtkJAAAABGdBTUEAALGPC/xhBQAAAAFzUkdCA… — 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... 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... data:image/jpg;base64,/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUF… — 200 — 0 B — 0 ms — datadata:image/jpg;base64,/9j/4AAQSkZJRgABAQEAYABgAAD//gA8Q1JFQVRPUjogZ2QtanBlZyB2MS4wICh1c2luZyBJSkcgS…data:image/jpg;base64,/9j/4AAQSkZJR... 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0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 558 ms LCP 1.5 shttps://tuwien.ac.at// https://tuwien.ac.at/ — 301 — 261 B — 126 ms — h2https://www.tuwien.at/www.tuwien.at/ https://www.tuwien.at/ — 200 — 33.8 KiB — 239 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 — 172 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 — 173 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 — 172 ms — h2https://www.tuwien.at/resources/fonts/Roboto/Bold/Roboto-Bold.woff2www.tuwien.at/resources/fonts/Robot... 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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 372ms · 460KB · €4/mo
www.tuwien.at
Other
Optional
Execution 195ms
Transfer 169 KB
Unused 68%
Monthly Cost €2/mo
www.tuwien.at
Other
Optional
Execution 91ms
Transfer 258 KB
Unused 49%
Monthly Cost €1/mo
www.tuwien.at
Other
Optional
Execution 86ms
Transfer 34 KB
Monthly Cost €1/mo

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

68% 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

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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