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

1.33g CO2 per view

FIX

1.33g CO2 per view

1.33g CO2 per page view

This page transfers 4.7 MB, producing an estimated 1.33g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.25g, network 0.23g, end-user device 0.85g.

Got: 1.33g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 159.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 159.1 kg of CO2 annually — equivalent to charging 19890 smartphones.

1.33g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 30% of websites

Sustainable Web Design model v4 · Page size: 4.7 MB

Your site

1.33g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.25g

Network

0.23g

End-user device

0.85g

At 10,000 monthly views: Monthly: 13.3 kg · Annual: 159.1 kg · ≈ 19890 smartphone charges

Green Hosting

Action

Not green

FIX

Not green

No confirmed renewable energy commitment detected

Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.

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 HostingNot Green Hosted

Hosting GoDaddy✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

70th percentile

FIX

70th percentile

1.33g CO2 — above the median website (0.60g)

Heavier than an estimated 30% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 70th percentile

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

Top 10%

Target

Median website

1.33g

70th percentile

Cleaner than 30% of websites

✗ Above the median website

vs Median 121% more

vs Target 165% 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

100% cached

PASS

100% cached

100% reduction on repeat visits

Returning visitors download only 16 KB (vs 4794 KB first visit). 34 of 36 resources are served from browser cache, saving 1.32g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 1.33g)

First visit

4794 KB

Repeat visit

16 KB

100% reduction on repeat visits

Saving 1.32g CO2 per returning visitor

34 resources served from cache · 2 resources re-downloaded

A+

Transfer Efficiency

94% efficient

PASS

94% efficient

Transfer efficiency: 94%

Only 265 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 265 KB (6% of page weight)

Unused JS 265 KB

0.07g unnecessary CO2 per visit

Actual transfer 4794 KB

Theoretical minimum 4529 KB

Potential savings 265 KB (0.07g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

7 images, 1532 KB total, 1421 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

1532 KB

Oversized

Wasted

1421 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.