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https://www.bunny.net

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
80
GRADE
B
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
D
CO2 Per Page Load
Action
1.06g CO2 per view
FIX
1.06g CO2 per view
Warning::
1.06g CO2 per page view
This page transfers 4.5 MB, producing an estimated 1.06g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.22g, end-user device 0.81g.
Got: 1.06g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 126.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 126.8 kg of CO2 annually — equivalent to charging 15848 smartphones.
Info::
Green hosting reduces data center emissions

1.06g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 37% of websites

Sustainable Web Design model v4 · Page size: 4.5 MB

Your site
1.06g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.22g
End-user device
0.81g
At 10,000 monthly views: Monthly: 10.6 kg · Annual: 126.8 kg · ≈ 15848 smartphone charges
D
Carbon Budget
Action
63th percentile
FIX
63th percentile
Warning::
1.06g CO2 — above the median website (0.60g)
Heavier than an estimated 37% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 63th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.06g

63rd percentile

Cleaner than 37% of websites

✗ Above the median website

vs Median 76% more
vs Target 111% more
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Hetzner Online GmbH, CDN: Bunny CDN
Info::
Hetzner Online GmbH: Verified by the Green Web Foundation
Info::
Bunny CDN: Carbon-neutral CDN with renewable energy
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 Hetzner Online GmbH✓CDN Bunny CDN✓

Hetzner Online GmbH: Verified by the Green Web Foundation

Bunny CDN: Carbon-neutral CDN with renewable energy

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 185 KB (vs 4571 KB first visit). 143 of 148 resources are served from browser cache, saving 1.01g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.06g)
First visit
4571 KB
Repeat visit
185 KB

96% reduction on repeat visits

Saving 1.01g CO2 per returning visitor

143 resources served from cache · 5 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 347 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 347 KB (8% of page weight)

Unused JS 347 KB

0.08g unnecessary CO2 per visit

Actual transfer 4571 KB
Theoretical minimum 4223 KB
Potential savings 347 KB (0.08g 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: Hetzner Online GmbH

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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