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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
84
GRADE
B
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
F
CO2 Per Page Load
Action
2.02g CO2 per view
FIX
2.02g CO2 per view
Critical::
2.02g CO2 per page view
This page transfers 8.5 MB, producing an estimated 2.02g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.42g, end-user device 1.55g.
Got: 2.02g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 242.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 242.6 kg of CO2 annually — equivalent to charging 30330 smartphones.
Info::
Green hosting reduces data center emissions

2.02g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.5 MB

Your site
2.02g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.42g
End-user device
1.55g
At 10,000 monthly views: Monthly: 20.2 kg · Annual: 242.6 kg · ≈ 30330 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.02g 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

2.02g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 237% more
vs Target 304% more
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Fastly
Info::
Next.js: Verified by the Green Web Foundation
Info::
Fastly: 100% renewable energy for edge network
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 Next.js✓CDN Fastly✓

Next.js: Verified by the Green Web Foundation

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 40 KB (vs 8747 KB first visit). 85 of 87 resources are served from browser cache, saving 2.01g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.02g)
First visit
8747 KB
Repeat visit
40 KB

100% reduction on repeat visits

Saving 2.01g CO2 per returning visitor

85 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 297 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 297 KB (3% of page weight)

Unused JS 297 KB

0.07g unnecessary CO2 per visit

Actual transfer 8747 KB
Theoretical minimum 8450 KB
Potential savings 297 KB (0.07g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Axis12 Ltd

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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