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 2 REVIEW 3 FIX

CO2 Per Page Load

Action

1.55g CO2 per view

FIX

1.55g CO2 per view

1.55g CO2 per page view

This page transfers 5.5 MB, producing an estimated 1.55g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.29g, network 0.27g, end-user device 1.00g.

Got: 1.55g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 186.2 kg CO2/year

With 10,000 page views per month, this page would generate approximately 186.2 kg of CO2 annually — equivalent to charging 23270 smartphones.

1.55g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 23% of websites

Sustainable Web Design model v4 · Page size: 5.5 MB

Your site

1.55g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.29g

Network

0.27g

End-user device

1.00g

At 10,000 monthly views: Monthly: 15.5 kg · Annual: 186.2 kg · ≈ 23270 smartphone charges

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

77th percentile

FIX

77th percentile

1.55g CO2 — above the median website (0.60g)

Heavier than an estimated 23% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 77th percentile

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

Top 10%

Target

Median website

1.55g

77th percentile

Cleaner than 23% of websites

✗ Above the median website

vs Median 159% more

vs Target 210% more

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

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 42 KB (vs 5609 KB first visit). 63 of 64 resources are served from browser cache, saving 1.54g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 1.55g)

First visit

5609 KB

Repeat visit

42 KB

99% reduction on repeat visits

Saving 1.54g CO2 per returning visitor

63 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 5609 KB

Theoretical minimum 5609 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

47 images, 1119 KB total, 856 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

1119 KB

Oversized

Wasted

856 KB

1 missing lazy loading

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