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Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
77
GRADE
C
FIX
1
REVIEW
2
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
7
4 PASS 2 REVIEW 1 FIX
D
Transfer Efficiency
Action
51% efficient
FIX
51% efficient
Warning::
Transfer efficiency: 51%
An estimated 487 KB (49%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 487 KB of unused JavaScript. This wasted data produces 0.11g of unnecessary CO2 per page view.
51% efficient

Total waste: 487 KB (49% of page weight)

Unused JS 487 KB

0.11g unnecessary CO2 per visit

Actual transfer 1002 KB
Theoretical minimum 515 KB
Potential savings 487 KB (0.11g CO2)

See Deep Analysis sections above for specific optimizations.

C
Web Font Weight Variants
Action
32 font weights loaded across 6 famil(y/ies)
REVIEW
32 font weights loaded across 6 famil(y/ies)
Warning::
32 font weights loaded -- likely 100+ KB of unused payload
Loading 32 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: Archivo, Google%20Sans%20Text%3A400%2C500, Google%20Sans%20Text%3A400%2C500%2C700, Google%20Symbols%3Aopsz%2Cwght%2CFILL%2CGRAD%4020..48%2C100..700%2C0..1%2C-50..200, Inter, Outfit.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
CO2 Per Page Load
0.23g CO2 per view
PASS
0.23g CO2 per view
Info::
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 0.18g.
Got: 0.23g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 27.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 27.8 kg of CO2 annually — equivalent to charging 3475 smartphones.
Info::
Green hosting reduces data center emissions

0.23g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 87% 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
0.18g
At 10,000 monthly views: Monthly: 2.3 kg · Annual: 27.8 kg · ≈ 3475 smartphone charges
A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Cloudflare: 100% renewable energy for global network since 2019
Info::
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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 11 KB (vs 1002 KB first visit). 27 of 28 resources are served from browser cache, saving 0.23g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.23g)
First visit
1002 KB
Repeat visit
11 KB

99% reduction on repeat visits

Saving 0.23g CO2 per returning visitor

27 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
13th percentile
PASS
13th percentile
Info::
0.23g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 87% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 13th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.23g

13th percentile

Cleaner than 87% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 61% cleaner ✓
vs Target 54% cleaner ✓
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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