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https://onlamp.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
72
GRADE
C
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.96g CO2 per view
FIX
0.96g CO2 per view
Info::
0.96g CO2 per page view
This page transfers 4.1 MB, producing an estimated 0.96g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.20g, end-user device 0.74g.
Got: 0.96g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 115.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 115.7 kg of CO2 annually — equivalent to charging 14466 smartphones.
Info::
Green hosting reduces data center emissions

0.96g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 40% of websites

Sustainable Web Design model v4 · Page size: 4.1 MB

Your site
0.96g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.20g
End-user device
0.74g
At 10,000 monthly views: Monthly: 9.6 kg · Annual: 115.7 kg · ≈ 14466 smartphone charges
D
Carbon Budget
Action
60th percentile
FIX
60th percentile
Warning::
0.96g CO2 — above the median website (0.60g)
Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 60th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.96g

60th percentile

Cleaner than 40% of websites

✗ Above the median website

vs Median 61% more
vs Target 93% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Apache HTTP Server uses renewable energy
Info::
Apache HTTP Server: Verified by the Green Web Foundation
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 Apache HTTP Server✓CDN Not identified✗

Apache HTTP Server: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Transfer Efficiency
90% efficient
REVIEW
90% efficient
Info::
Transfer efficiency: 90%
An estimated 436 KB (10%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 436 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
90% efficient

Total waste: 436 KB (10% of page weight)

Unused JS 436 KB

0.10g unnecessary CO2 per visit

Actual transfer 4172 KB
Theoretical minimum 3736 KB
Potential savings 436 KB (0.10g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 40 KB (vs 4172 KB first visit). 131 of 133 resources are served from browser cache, saving 0.95g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.96g)
First visit
4172 KB
Repeat visit
40 KB

99% reduction on repeat visits

Saving 0.95g CO2 per returning visitor

131 resources served from cache · 2 resources re-downloaded

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

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

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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