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https://arm.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
59
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.92g CO2 per view
FIX
1.92g CO2 per view
Warning::
1.92g CO2 per page view
This page transfers 6.8 MB, producing an estimated 1.92g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.35g, network 0.33g, end-user device 1.23g.
Got: 1.92g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 230.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 230.0 kg of CO2 annually — equivalent to charging 28750 smartphones.

1.92g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 13% of websites

Sustainable Web Design model v4 · Page size: 6.8 MB

Your site
1.92g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.35g
Network
0.33g
End-user device
1.23g
At 10,000 monthly views: Monthly: 19.2 kg · Annual: 230.0 kg · ≈ 28750 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
87th percentile
FIX
87th percentile
Warning::
1.92g CO2 — above the median website (0.60g)
Heavier than an estimated 13% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 87th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.92g

87th percentile

Cleaner than 13% of websites

✗ Above the median website

vs Median 219% more
vs Target 283% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 57 KB (vs 6930 KB first visit). 168 of 170 resources are served from browser cache, saving 1.90g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.92g)
First visit
6930 KB
Repeat visit
57 KB

99% reduction on repeat visits

Saving 1.90g CO2 per returning visitor

168 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 316 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 316 KB (5% of page weight)

Unused JS 316 KB

0.09g unnecessary CO2 per visit

Actual transfer 6930 KB
Theoretical minimum 6614 KB
Potential savings 316 KB (0.09g CO2)

See Deep Analysis sections above for specific optimizations.

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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