Sustainability

· 7 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

4 PASS 3 REVIEW

Transfer Efficiency

89% efficient

REVIEW

89% efficient

Transfer efficiency: 89%

An estimated 103 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 103 KB of unused JavaScript. This wasted data produces 0.02g of unnecessary CO2 per page view.

Total waste: 103 KB (11% of page weight)

Unused JS 103 KB

0.02g unnecessary CO2 per visit

Actual transfer 980 KB

Theoretical minimum 876 KB

Potential savings 103 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

Web Font Weight Variants

5 font weights loaded across 1 famil(y/ies)

REVIEW

5 font weights loaded across 1 famil(y/ies)

5 font weights loaded -- review whether all are used

5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: Plus Jakarta Sans.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

CO2 Per Page Load

0.23g CO2 per view

PASS

0.23g CO2 per view

0.23g CO2 per page view

This page transfers 1.0 MB, producing an estimated 0.23g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.05g, end-user device 0.17g.

Got: 0.23g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 27.2 kg CO2/year

With 10,000 page views per month, this page would generate approximately 27.2 kg of CO2 annually — equivalent to charging 3398 smartphones.

Green hosting reduces data center emissions

0.23g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 88% of websites

Sustainable Web Design model v4 · Page size: 1.0 MB

Your site

0.23g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.05g

End-user device

0.17g

At 10,000 monthly views: Monthly: 2.3 kg · Annual: 27.2 kg · ≈ 3398 smartphone charges

Green Hosting

Green (cdn)

PASS

Green (cdn)

Cloudflare CDN uses renewable energy

Since most traffic is served through the CDN, the majority of data transfer energy is renewable.

Cloudflare: 100% renewable energy for global network since 2019

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 Not identified✗CDN Cloudflare✓

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

90% cached

PASS

90% cached

90% reduction on repeat visits

Returning visitors download only 95 KB (vs 980 KB first visit). 64 of 66 resources are served from browser cache, saving 0.20g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 0.23g)

First visit

980 KB

Repeat visit

95 KB

90% reduction on repeat visits

Saving 0.20g CO2 per returning visitor

64 resources served from cache · 2 resources re-downloaded

Carbon Budget

12th percentile

PASS

12th percentile

0.23g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 88% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 12th percentile

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

Top 10%

Target

Median website

0.23g

12th percentile

Cleaner than 88% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 62% cleaner ✓

vs Target 55% cleaner ✓

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