Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Device:

Mobile Desktop

Checks

3 PASS 3 REVIEW 1 FIX

Carbon Budget

Action

52th percentile

FIX

52th percentile

0.67g CO2 — above the median website (0.60g)

Heavier than an estimated 48% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 52th percentile

Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.

Top 10%

Target

Median website

0.67g

52nd percentile

Cleaner than 48% of websites

✗ Above the median website

vs Median 12% more

vs Target 34% more

CO2 Per Page Load

0.67g CO2 per view

REVIEW

0.67g CO2 per view

0.67g CO2 per page view

This page transfers 2.8 MB, producing an estimated 0.67g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.14g, end-user device 0.51g.

Got: 0.67g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 80.4 kg CO2/year

With 10,000 page views per month, this page would generate approximately 80.4 kg of CO2 annually — equivalent to charging 10055 smartphones.

Green hosting reduces data center emissions

0.67g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 48% of websites

Sustainable Web Design model v4 · Page size: 2.8 MB

Your site

0.67g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.02g

Network

0.14g

End-user device

0.51g

At 10,000 monthly views: Monthly: 6.7 kg · Annual: 80.4 kg · ≈ 10055 smartphone charges

Green Hosting

Green (hosting)

REVIEW

Green (hosting)

IONOS SE uses renewable energy

IONOS SE: Verified by the Green Web Foundation

Green hosting status based on known provider commitments

Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.

Green Hosting✓ Green Hosted

Hosting IONOS SE✓CDN Not identified✗

IONOS SE: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

Web Font Weight Variants

No detectable Google Fonts weights

REVIEW

No detectable Google Fonts weights

The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.

A+

Repeat Visit Weight

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 42 KB (vs 2900 KB first visit). 37 of 38 resources are served from browser cache, saving 0.66g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.67g)

First visit

2900 KB

Repeat visit

42 KB

99% reduction on repeat visits

Saving 0.66g CO2 per returning visitor

37 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

100% efficient

PASS

100% efficient

Transfer efficiency: 100%

Only 0 KB of potential savings identified. Your page is well-optimized for size.

Actual transfer 2900 KB

Theoretical minimum 2900 KB

See Deep Analysis sections above for specific optimizations.

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: IONOS SE

Image Optimization

13 images, 827 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

827 KB

12 missing alt text 13 missing dimensions 12 missing lazy loading

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