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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
81
GRADE
B
FIX
1
REVIEW
2
PASS
4
INFO
1
Device:
Mobile Desktop
Checks
8
4 PASS 2 REVIEW 1 FIX
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
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.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

C
Web Font Weight Variants
Action
18 font weights loaded across 1 famil(y/ies)
REVIEW
18 font weights loaded across 1 famil(y/ies)
Warning::
18 font weights loaded -- likely 100+ KB of unused payload
Loading 18 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: Roboto Slab.
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
0.22g CO2 per view
PASS
0.22g CO2 per view
Info::
0.22g CO2 per page view
This page transfers 0.8 MB, producing an estimated 0.22g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.04g, end-user device 0.14g.
Got: 0.22g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 26.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 26.2 kg of CO2 annually — equivalent to charging 3280 smartphones.

0.22g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 89% of websites

Sustainable Web Design model v4 · Page size: 0.8 MB

Your site
0.22g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.04g
End-user device
0.14g
At 10,000 monthly views: Monthly: 2.2 kg · Annual: 26.2 kg · ≈ 3280 smartphone charges
A+
Repeat Visit Weight
91% cached
PASS
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 69 KB (vs 790 KB first visit). 60 of 61 resources are served from browser cache, saving 0.20g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.22g)
First visit
790 KB
Repeat visit
69 KB

91% reduction on repeat visits

Saving 0.20g CO2 per returning visitor

60 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
11th percentile
PASS
11th percentile
Info::
0.22g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 89% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 11th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.22g

11th percentile

Cleaner than 89% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 64% cleaner ✓
vs Target 56% cleaner ✓
A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 72 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 72 KB (9% of page weight)

Unused JS 72 KB

0.02g unnecessary CO2 per visit

Actual transfer 790 KB
Theoretical minimum 718 KB
Potential savings 72 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
30 images, 610 KB total, 30 KB wasted
INFO

Image Optimization Audit

Total Images

30

Total Size

610 KB

Oversized

1

Wasted

30 KB

16 missing dimensions 10 missing lazy loading
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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