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

2 PASS 3 REVIEW 2 FIX

Green Hosting

Action

Unknown

FIX

Unknown

Hosting provider could not be identified

Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.

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 HostingUnable to Determine

Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

52th percentile

FIX

52th percentile

0.70g 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

0.70g

52nd percentile

Cleaner than 48% of websites

✗ Above the median website

vs Median 17% more

vs Target 41% more

CO2 Per Page Load

0.70g CO2 per view

REVIEW

0.70g CO2 per view

0.70g CO2 per page view

This page transfers 2.5 MB, producing an estimated 0.70g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.13g, network 0.12g, end-user device 0.45g.

Got: 0.70g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 84.4 kg CO2/year

With 10,000 page views per month, this page would generate approximately 84.4 kg of CO2 annually — equivalent to charging 10544 smartphones.

0.70g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 48% of websites

Sustainable Web Design model v4 · Page size: 2.5 MB

Your site

0.70g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.13g

Network

0.12g

End-user device

0.45g

At 10,000 monthly views: Monthly: 7.0 kg · Annual: 84.4 kg · ≈ 10544 smartphone charges

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.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

98% cached

PASS

98% cached

98% reduction on repeat visits

Returning visitors download only 56 KB (vs 2541 KB first visit). 953 of 954 resources are served from browser cache, saving 0.69g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 0.70g)

First visit

2541 KB

Repeat visit

56 KB

98% reduction on repeat visits

Saving 0.69g CO2 per returning visitor

953 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 2541 KB

Theoretical minimum 2541 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

200 images, 811 KB total, 679 KB wasted

INFO

Image Optimization Audit

Total Images

200

Total Size

811 KB

Oversized

Wasted

679 KB

6 missing dimensions 198 missing lazy loading

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