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

100

Accessibility

100

Best Practices

100

SEO

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

532 ms

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

1.03 s

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

0 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.

619 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.

1.03 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 (1.2 MiB of 1.2 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

1.2 MB transferred, 31 requests

REVIEW

1.2 MB transferred, 31 requests

Page weighs 1.8 MB (1.2 MB transferred)

31 HTTP requests

Estimated 0.26 g CO2 per page load

1.2 MB transferred

31 requests

0.26 g CO2 per page load

Images 978.4 KiB 77%

Fonts 118.0 KiB 9%

JavaScript 72.2 KiB 6%

CSS 47.3 KiB 4%

Other 24.0 KiB 2%

HTML 22.2 KiB 2%

Other 475 B 0%

Other 61 B 0%

0 2.4 MB 4.9 MB

Under budget

Image Optimization

10 images, 0 KB saveable

REVIEW

10 images, 0 KB saveable

All images are well-optimized

10 images 978 KB

0 oversized -0 KB

6 legacy format

0 missing dimensions CLS risk

Page Weight Inventory

Action

31 resources · 1.2 MB · 25 KB savings available

REVIEW

31 resources · 1.2 MB · 25 KB savings available

Page weight 239 KB over 1MB target

Got: 1.2 MB Expected: ≤ 1 MB

30 third-party resources (100% of weight)

2 resources over 200KB

31 resources · 1.2 MiB · 30 third-party 238.6 KiB over 1MB target

Image 79% · 1002.3 KiB

Font 9% · 118.0 KiB

JavaScript 6% · 72.2 KiB

CSS 4% · 47.3 KiB

Document 2% · 22.3 KiB

Other 0% · 536 B

~25.1 KiB of savings available

Remove unused JavaScript: 25.1 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

31 resources			1.2 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

178ms total JS execution

PASS

178ms total JS execution

https://www.hu-berlin.de/: 128ms CPU time

Unattributable: 50ms CPU time

Third-party scripts: 178ms (100% of total)

Main Thread Breakdown

Other 44% Style & Layout 31% Script Evaluation 14% Parse HTML & CSS 4% Script Parsing & Compilation 3% Rendering 3%

Script	Total	Scripting	Parse/Compile	Party
https://www.hu-berlin.de/	128ms	4ms	1ms	3rd
Unattributable	50ms	3ms	0ms	3rd

A+

Font Loading

6 fonts (118 KB)

PASS

6 fonts (118 KB)

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

Web fonts

118 KB total

Render-blocking

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

ScalaPro.woff2 woff2 swap

Size 75 KB

Load time 115 ms

Start 364 ms