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

1.01g CO2 per view

FIX

1.01g CO2 per view

1.01g CO2 per page view

This page transfers 3.6 MB, producing an estimated 1.01g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.19g, network 0.18g, end-user device 0.65g.

Got: 1.01g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 121.6 kg CO2/year

With 10,000 page views per month, this page would generate approximately 121.6 kg of CO2 annually — equivalent to charging 15198 smartphones.

1.01g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 39% of websites

Sustainable Web Design model v4 · Page size: 3.6 MB

Your site

1.01g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.19g

Network

0.18g

End-user device

0.65g

At 10,000 monthly views: Monthly: 10.1 kg · Annual: 121.6 kg · ≈ 15198 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

61th percentile

FIX

61th percentile

1.01g CO2 — above the median website (0.60g)

Heavier than an estimated 39% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 61th percentile

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

Top 10%

Target

Median website

1.01g

61st percentile

Cleaner than 39% of websites

✗ Above the median website

vs Median 69% more

vs Target 103% more

Web Font Weight Variants

Action

12 font weights loaded across 3 famil(y/ies)

REVIEW

12 font weights loaded across 3 famil(y/ies)

12 font weights loaded -- likely 100+ KB of unused payload

Loading 12 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: JetBrains Mono, Outfit, Plus Jakarta Sans.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

100% cached

PASS

100% cached

100% reduction on repeat visits

Returning visitors download only 1 KB (vs 3663 KB first visit). 30 of 31 resources are served from browser cache, saving 1.01g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 1.01g)

First visit

3663 KB

Repeat visit

1 KB

100% reduction on repeat visits

Saving 1.01g CO2 per returning visitor

30 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 3663 KB

Theoretical minimum 3663 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

7 images, 2948 KB total, 2384 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

2948 KB

Oversized

Wasted

2384 KB

6 missing dimensions 5 missing lazy loading

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