Performance

· 14 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

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.

889 ms

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

1.37 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.

0.008

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

982 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.

1.37 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 (407.0 KiB of 407.2 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.

JS Bundles

4 scripts, 90 KB unused

REVIEW

4 scripts, 90 KB unused

https://cmp-cdn.golem.de/Notice.8f529.js: 66 KB unused (73%)

Consider code splitting or tree shaking to reduce unused code.

https://cmp-cdn.golem.de/wrapperMessagingWithoutDe...: 24 KB unused (48%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 90 KB

90 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://cmp-cdn.golem.de/Notice.8f529.js	91 KB	66 KB (73%)	✓	3rd
https://cmp-cdn.golem.de/wrapperMessagingWithoutDetection.js	51 KB	24 KB (48%)	✓	3rd
https://www.golem.de/staticrl/scripts/golem_consent_199-min.js	10 KB	—	✓	3rd
https://cmp-cdn.golem.de/polyfills.01516.js	2 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

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

407 KB transferred, 24 requests

PASS

407 KB transferred, 24 requests

Page weighs 977 KB (407 KB transferred)

24 HTTP requests

Estimated 0.08 g CO2 per page load

407 KB transferred

24 requests

0.08 g CO2 per page load

JavaScript 154.4 KiB 38%

CSS 90.0 KiB 22%

Fonts 69.7 KiB 17%

Other 37.9 KiB 9%

Images 24.5 KiB 6%

HTML 20.6 KiB 5%

Other 10.1 KiB 2%

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.

Image Optimization

3 images, 0 KB saveable

PASS

3 images, 0 KB saveable

https://www.golem.de/staticrl/images/Golem-Logo-wh... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

3 images 24 KB

0 oversized -0 KB

2 legacy format

1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

A+

JS Execution Cost

No JS execution data

PASS

No JS execution data

No significant JS execution detected

Main Thread Breakdown

Script Evaluation 47% Other 28% Style & Layout 13% Script Parsing & Compilation 7%

A+

Font Loading

2 fonts (70 KB)

PASS

2 fonts (70 KB)

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

Web fonts

70 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

SpaceGrotesk-variable.w... woff2 swap

Size 48 KB

Load time 200 ms

Start 286 ms

Risk FOUT — text flashes from fallback to web font

DroidSans.woff2 woff2 swap

Size 21 KB

Load time 135 ms

Start 1.3 s

Risk FOUT — text flashes from fallback to web font

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)

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

24 resources · 407 KB · 90 KB savings available

PASS

24 resources · 407 KB · 90 KB savings available

Within 1MB page-weight target

Got: 407 KB

~90 KB of savings available

23 third-party resources (100% of weight)

24 resources · 407.2 KiB · 23 third-party Within 1MB page-weight target

JavaScript 38% · 154.4 KiB

CSS 22% · 90.0 KiB

Font 17% · 69.7 KiB

Image 15% · 61.9 KiB

Document 5% · 21.3 KiB

Other 2% · 9.8 KiB

~90.4 KiB of savings available

Remove unused JavaScript: 90.4 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

24 resources			407.2 KiB

Network Waterfall

24 requests over 1396ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.