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https://windowsphone.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
82
GRADE
B
FIX
1
REVIEW
1
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 1 REVIEW 1 FIX
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
Azure: Microsoft is carbon-negative; Azure renewable varies by region
Info::
Akamai: Committed to 50% renewable by 2030
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 HostingNot Green Hosted
Hosting Azure✗CDN Akamai✗

Azure: Microsoft is carbon-negative; Azure renewable varies by region

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
CO2 Per Page Load
0.29g CO2 per view
PASS
0.29g CO2 per view
Info::
0.29g CO2 per page view
This page transfers 1.0 MB, producing an estimated 0.29g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.05g, end-user device 0.19g.
Got: 0.29g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 35.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 35.0 kg of CO2 annually — equivalent to charging 4368 smartphones.

0.29g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 81% of websites

Sustainable Web Design model v4 · Page size: 1.0 MB

Your site
0.29g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.05g
End-user device
0.19g
At 10,000 monthly views: Monthly: 2.9 kg · Annual: 35.0 kg · ≈ 4368 smartphone charges
A+
Repeat Visit Weight
80% cached
PASS
80% cached
Info::
80% reduction on repeat visits
Returning visitors download only 206 KB (vs 1053 KB first visit). 73 of 82 resources are served from browser cache, saving 0.23g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 0.29g)
First visit
1053 KB
Repeat visit
206 KB

80% reduction on repeat visits

Saving 0.23g CO2 per returning visitor

73 resources served from cache · 9 resources re-downloaded

A
Carbon Budget
19th percentile
PASS
19th percentile
Info::
0.29g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 81% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 19th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.29g

19th percentile

Cleaner than 81% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 51% cleaner ✓
vs Target 42% cleaner ✓
A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 70 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 70 KB (7% of page weight)

Unused JS 70 KB

0.02g unnecessary CO2 per visit

Actual transfer 1053 KB
Theoretical minimum 983 KB
Potential savings 70 KB (0.02g 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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