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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
58
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
3.47g CO2 per view
FIX
3.47g CO2 per view
Critical::
3.47g CO2 per page view
This page transfers 12.3 MB, producing an estimated 3.47g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.64g, network 0.60g, end-user device 2.23g.
Got: 3.47g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 417.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 417.0 kg of CO2 annually — equivalent to charging 52124 smartphones.

3.47g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 12.3 MB

Your site
3.47g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.64g
Network
0.60g
End-user device
2.23g
At 10,000 monthly views: Monthly: 34.7 kg · Annual: 417.0 kg · ≈ 52124 smartphone charges
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

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.47g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

3.47g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 479% more
vs Target 595% more
C
Web Font Weight Variants
Action
11 font weights loaded across 3 famil(y/ies)
REVIEW
11 font weights loaded across 3 famil(y/ies)
Warning::
11 font weights loaded -- likely 100+ KB of unused payload
Loading 11 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: Big Shoulders Display, Inter, JetBrains Mono.
C
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
Info::
100% reduction on repeat visits
Returning visitors download only 10 KB (vs 12564 KB first visit). 33 of 34 resources are served from browser cache, saving 3.47g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 3.47g)
First visit
12564 KB
Repeat visit
10 KB

100% reduction on repeat visits

Saving 3.47g CO2 per returning visitor

33 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
100% efficient
Actual transfer 12564 KB
Theoretical minimum 12564 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization
31 images, 6675 KB total, 3090 KB wasted
INFO

Image Optimization Audit

Total Images

31

Total Size

6675 KB

Oversized

5

Wasted

3090 KB

7 missing dimensions
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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