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 4 REVIEW 1 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

CO2 Per Page Load

0.58g CO2 per view

REVIEW

0.58g CO2 per view

0.58g CO2 per page view

This page transfers 2.0 MB, producing an estimated 0.58g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.10g, end-user device 0.37g.

Got: 0.58g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 69.3 kg CO2/year

With 10,000 page views per month, this page would generate approximately 69.3 kg of CO2 annually — equivalent to charging 8665 smartphones.

0.58g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 53% of websites

Sustainable Web Design model v4 · Page size: 2.0 MB

Your site

0.58g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.11g

Network

0.10g

End-user device

0.37g

At 10,000 monthly views: Monthly: 5.8 kg · Annual: 69.3 kg · ≈ 8665 smartphone charges

Carbon Budget

47th percentile

REVIEW

47th percentile

0.58g CO2 — below the median website (0.60g)

Better than an estimated 53% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.

Estimated 47th percentile

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

Top 10%

Target

Median website

0.58g

47th percentile

Cleaner than 53% of websites

✗ Above the median website

vs Median 4% cleaner ✓

vs Target 16% more

Web Font Weight Variants

5 font weights loaded across 4 famil(y/ies)

REVIEW

5 font weights loaded across 4 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: DM Sans, DM Serif Display, Elsie, Marcellus.

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 47 KB (vs 2088 KB first visit). 66 of 67 resources are served from browser cache, saving 0.56g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.58g)

First visit

2088 KB

Repeat visit

47 KB

98% reduction on repeat visits

Saving 0.56g CO2 per returning visitor

66 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

97% efficient

PASS

97% efficient

Transfer efficiency: 97%

Only 72 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 72 KB (3% of page weight)

Unused JS 72 KB

0.02g unnecessary CO2 per visit

Actual transfer 2088 KB

Theoretical minimum 2015 KB

Potential savings 72 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

22 images, 631 KB total, 524 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

631 KB

Oversized

Wasted

524 KB

3 missing lazy loading

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