Performance

· 17 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.

2.92 s

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

6.97 s

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

65 ms

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

0.022

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

3.14 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.

7.03 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

10 PASS 3 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 (604.6 KiB of 604.8 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

17 images, 0 KB saveable

REVIEW

17 images, 0 KB saveable

is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

17 images 316 KB

0 oversized -0 KB

16 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.

JS Execution Cost

Action

1481ms total JS execution

REVIEW

1481ms total JS execution

https://www.presseportal.de/: 805ms CPU time

Unattributable: 300ms CPU time

https://cdn.opencmp.net/tcf-v2/platforms/modern/cm...: 115ms CPU time

https://www.presseportal.de/assets/js/libs/require...: 107ms CPU time

https://cdn.opencmp.net/tcf-v2/platforms/modern/ui...: 95ms CPU time

Third-party scripts: 1481ms (100% of total)

Main Thread Breakdown

Other 27% Rendering 26% Script Evaluation 26% Style & Layout 16% Script Parsing & Compilation 3%

Script	Total	Scripting	Parse/Compile	Party
https://www.presseportal.de/	805ms	20ms	7ms	3rd
Unattributable	300ms	39ms	0ms	3rd
https://cdn.opencmp.net/tcf-v2/platforms/modern/cmp-latest.js	115ms	95ms	14ms	3rd
https://www.presseportal.de/assets/js/libs/requirejs/require-min.js?b3f8c0f	107ms	53ms	2ms	3rd
https://cdn.opencmp.net/tcf-v2/platforms/modern/ui.js	95ms	76ms	8ms	3rd
https://cdn.opencmp.net/tcf-v2/cmp-stub-latest.js	58ms	54ms	3ms	3rd

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

605 KB transferred, 38 requests

PASS

605 KB transferred, 38 requests

Page weighs 1.7 MB (605 KB transferred)

38 HTTP requests

Estimated 0.12 g CO2 per page load

605 KB transferred

38 requests

0.12 g CO2 per page load

Images 315.9 KiB 52%

JavaScript 146.4 KiB 24%

Other 96.2 KiB 16%

HTML 23.3 KiB 4%

Fonts 11.6 KiB 2%

CSS 9.3 KiB 2%

Other 1.8 KiB 0%

Other 502 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+

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 39 ms

Start 584 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	0 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

5 hints, 0 missing preconnects

PASS

5 hints, 0 missing preconnects

Page uses 5 resource hint(s)

Current Resource Hints

preconnect

preload

dns-prefetch

—

prefetch

—

5 resource hints configured

Page Weight Inventory

38 resources · 605 KB · 25 KB savings available

PASS

38 resources · 605 KB · 25 KB savings available

Within 1MB page-weight target

Got: 605 KB

37 third-party resources (100% of weight)

38 resources · 604.8 KiB · 37 third-party Within 1MB page-weight target

Image 52% · 317.4 KiB

JavaScript 24% · 146.4 KiB

Other 15% · 89.6 KiB

Document 4% · 23.5 KiB

CSS 3% · 16.2 KiB

Font 2% · 11.6 KiB

~24.9 KiB of savings available

Remove unused JavaScript: 24.9 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

38 resources			604.8 KiB

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

38 requests over 1318ms

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 1481ms · 120KB · €20/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
www.presseportal.de www.presseportal.de	Other	805ms	23 KB	—	€11/mo	Costly
Unattributable Unattributable	Other	300ms	0 KB	—	€4/mo	Costly
cdn.opencmp.net cdn.opencmp.net	Other	115ms	51 KB	50%	€2/mo	Optional
www.presseportal.de www.presseportal.de	Other	107ms	6 KB	—	€1/mo	Optional
cdn.opencmp.net cdn.opencmp.net	Other	95ms	29 KB	—	€1/mo	Optional
cdn.opencmp.net cdn.opencmp.net	Other	58ms	11 KB	—	€1/mo	Optional

www.presseportal.de

Other

Costly

Execution 805ms

Transfer 23 KB

Monthly Cost €11/mo

Unattributable

Other

Costly

Execution 300ms

Transfer 0 KB

Monthly Cost €4/mo

cdn.opencmp.net

Other

Optional

Execution 115ms

Transfer 51 KB

Unused 50%

Monthly Cost €2/mo

www.presseportal.de

Other

Optional

Execution 107ms

Transfer 6 KB

Monthly Cost €1/mo

cdn.opencmp.net

Other

Optional

Execution 95ms

Transfer 29 KB

Monthly Cost €1/mo

cdn.opencmp.net

Other

Optional

Execution 58ms

Transfer 11 KB

Monthly Cost €1/mo

These scripts may cost more than they're worth

www.presseportal.de adds 805ms and costs ~€11/month
Unattributable adds 300ms 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.presseportal.de takes 805ms 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

Unattributable takes 300ms 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.