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

SEO

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

1.39 s

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

1.44 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.

0.001

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

1.69 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.

1.44 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

9 PASS 2 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 (937.9 KiB of 938.1 KiB)

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.

Image Optimization

20 images, 0 KB saveable

REVIEW

20 images, 0 KB saveable

is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

20 images 649 KB

0 oversized -0 KB

19 legacy format

1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

Page Weight Budget

938 KB transferred, 41 requests

PASS

938 KB transferred, 41 requests

Page weighs 2.0 MB (938 KB transferred)

41 HTTP requests

Estimated 0.19 g CO2 per page load

938 KB transferred

41 requests

0.19 g CO2 per page load

Images 649.2 KiB 69%

JavaScript 146.3 KiB 16%

Other 96.1 KiB 10%

HTML 23.3 KiB 2%

Fonts 11.6 KiB 1%

CSS 9.3 KiB 1%

Other 1.8 KiB 0%

Other 503 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

JS Execution Cost

289ms total JS execution

PASS

289ms total JS execution

https://www.presseportal.de/: 199ms CPU time

Unattributable: 90ms CPU time

Third-party scripts: 289ms (100% of total)

Main Thread Breakdown

Other 29% Script Evaluation 25% Rendering 23% Style & Layout 17% Script Parsing & Compilation 3%

Script	Total	Scripting	Parse/Compile	Party
https://www.presseportal.de/	199ms	5ms	2ms	3rd
Unattributable	90ms	16ms	0ms	3rd

A+

Font Loading

1 fonts (12 KB)

PASS

1 fonts (12 KB)

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

Web fonts

12 KB total

Render-blocking

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

newsaktuellIcons-Roman.... woff swap

Size 12 KB

Load time 41 ms

Start 859 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 ~3 KB and ~6 ms

A+

JS Bundles

9 scripts, 25 KB unused

PASS

9 scripts, 25 KB unused

https://cdn.opencmp.net/tcf-v2/platforms/modern/cm...: 25 KB unused (50%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 25 KB

25 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://cdn.opencmp.net/tcf-v2/platforms/modern/cmp-latest.js	51 KB	25 KB (50%)	✓	3rd
https://data-1a8175bc05.presseportal.de/iomm/latest/manager/base/es6/bundle.js	17 KB	—	✓	3rd
https://data-1a8175bc05.presseportal.de/iomm/latest/bootstrap/loader.js	1 KB	—	✓	3rd
https://cdn.opencmp.net/tcf-v2/cmp-stub-latest.js	11 KB	—	✓	3rd
https://www.presseportal.de/assets/js/libs/requirejs/require-min.js?b3f8c0f	6 KB	—	✓	3rd
https://data-1a8175bc05.presseportal.de/iomb/latest/sensor/manager/base/es6/bundle.js	9 KB	—	✓	3rd
https://www.presseportal.de/assets/js/page-doorpage.js?b3f8c0f	22 KB	—	✓	3rd
https://www.presseportal.de/assets/js/config.js?b3f8c0f	1 KB	—	✓	3rd
https://cdn.opencmp.net/tcf-v2/platforms/modern/ui.js	29 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

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

Page Weight Inventory

41 resources · 938 KB · 25 KB savings available

PASS

41 resources · 938 KB · 25 KB savings available

Within 1MB page-weight target

Got: 938 KB

40 third-party resources (100% of weight)

41 resources · 938.1 KiB · 40 third-party Within 1MB page-weight target

Image 69% · 650.8 KiB

JavaScript 16% · 146.3 KiB

Other 10% · 89.6 KiB

Document 3% · 23.5 KiB

CSS 2% · 16.2 KiB

Font 1% · 11.6 KiB

~24.9 KiB of savings available

Remove unused JavaScript: 24.9 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

41 resources			938.1 KiB

Network Waterfall

41 requests over 1473ms

INFO

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 289ms · 23KB · €4/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
www.presseportal.de www.presseportal.de	Other	199ms	23 KB	—	€3/mo	Optional
Unattributable Unattributable	Other	90ms	0 KB	—	€1/mo	Optional

www.presseportal.de

Other

Optional

Execution 199ms

Transfer 23 KB

Monthly Cost €3/mo

Unattributable

Other

Optional

Execution 90ms

Transfer 0 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

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.