Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

100

Best Practices

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

777 ms

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

1.26 s

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

6 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.

813 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.28 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

7 PASS 4 REVIEW 2 FIX

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (1.4 MiB of 1.4 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

HTTP Caching

Action

No cache headers

FIX

No cache headers

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.

Page Weight Budget

1.4 MB transferred, 58 requests

REVIEW

1.4 MB transferred, 58 requests

Page weighs 1.9 MB (1.4 MB transferred)

Images are 1.0 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 1.0 MB

58 HTTP requests

Estimated 0.29 g CO2 per page load

1.4 MB transferred

58 requests

0.29 g CO2 per page load

Images 1.0 MiB 76%

JavaScript 161.6 KiB 11%

Fonts 124.2 KiB 9%

CSS 33.6 KiB 2%

HTML 20.3 KiB 1%

Other 3.4 KiB 0%

Other 1.5 KiB 0%

Other 500 B 0%

Other 120 B 0%

0 2.4 MB 4.9 MB

Under 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

Image Optimization

35 images, 0 KB saveable

REVIEW

35 images, 0 KB saveable

All images are well-optimized

35 images 1.0 MB

0 oversized -0 KB

35 legacy format

0 missing dimensions CLS risk

Page Weight Inventory

Action

58 resources · 1.4 MB · 46 KB savings available

REVIEW

58 resources · 1.4 MB · 46 KB savings available

Page weight 392 KB over 1MB target

Got: 1.4 MB Expected: ≤ 1 MB

57 third-party resources (100% of weight)

58 resources · 1.4 MiB · 57 third-party 392.0 KiB over 1MB target

Image 76% · 1.0 MiB

JavaScript 11% · 161.6 KiB

Font 9% · 124.2 KiB

CSS 2% · 33.6 KiB

Document 2% · 21.4 KiB

Other 0% · 2.1 KiB

~46.3 KiB of savings available

Remove unused JavaScript: 46.3 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

58 resources			1.4 MiB

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

All text resources are properly compressed.

A+

JS Execution Cost

445ms total JS execution

PASS

445ms total JS execution

https://www.uni-wuerzburg.de/typo3temp/assets/comp...: 160ms CPU time

https://www.uni-wuerzburg.de/: 151ms CPU time

Unattributable: 135ms CPU time

Third-party scripts: 445ms (100% of total)

Main Thread Breakdown

Script Evaluation 32% Other 28% Style & Layout 21% Parse HTML & CSS 10% Script Parsing & Compilation 4% Rendering 4%

Script	Total	Scripting	Parse/Compile	Party
https://www.uni-wuerzburg.de/typo3temp/assets/compressed/merged-cbc3b9cee04d0b5ce1db5b83afe78ea0-0d2b905a0f6ee977d2e028a16261b062.js.gzip?1701247136	160ms	108ms	5ms	3rd
https://www.uni-wuerzburg.de/	151ms	5ms	1ms	3rd
Unattributable	135ms	12ms	0ms	3rd

A+

Font Loading

6 fonts (124 KB)

PASS

6 fonts (124 KB)

6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

124 KB total

Render-blocking

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

roboto-v18-latin_latin-... woff2 swap

Size 23 KB

Load time 45 ms

Start 535 ms