https://mushirai.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
79
GRADE
C
FIX
0
REVIEW
5
PASS
2
INFO
1
Checks
82 PASS 5 REVIEW
BCO2 Per Page Load0.52g CO2 per viewREVIEW
CO2 Per Page Load
0.52g CO2 per view
0.52g CO2 per view
Info::
0.52g CO2 per page view
This page transfers 2.2 MB, producing an estimated 0.52g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.11g, end-user device 0.40g.
Got: 0.52g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 61.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 61.8 kg of CO2 annually — equivalent to charging 7729 smartphones.
Info::
Green hosting reduces data center emissions
0.52g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 59% of websites
Sustainable Web Design model v4 · Page size: 2.2 MB
Your site
0.52g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.11g
End-user device
0.40g
At 10,000 monthly views: Monthly: 5.2 kg · Annual: 61.8 kg · ≈ 7729 smartphone charges
BCarbon Budget41th percentileREVIEW
Carbon Budget
41th percentile
41th percentile
Info::
0.52g CO2 — below the median website (0.60g)
Better than an estimated 59% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 41th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.52g
41st percentile
Cleaner than 59% of websites
✗ Above the median website
vs Median 14% cleaner ✓
vs Target 3% more
BTransfer Efficiency81% efficientREVIEW
Transfer Efficiency
81% efficient
81% efficient
Info::
Transfer efficiency: 81%
An estimated 425 KB (19%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 425 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
Total waste: 425 KB (19% of page weight)
Unused JS 425 KB
0.10g unnecessary CO2 per visit
Actual transfer 2229 KB
Theoretical minimum 1803 KB
Potential savings 425 KB (0.10g CO2)
See Deep Analysis sections above for specific optimizations.
CWeb Font Weight VariantsAction8 font weights loaded across 2 famil(y/ies)REVIEW
Web Font Weight Variants
Action8 font weights loaded across 2 famil(y/ies)
8 font weights loaded across 2 famil(y/ies)
Warning::
8 font weights loaded -- likely 100+ KB of unused payload
Loading 8 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Manrope, Sora.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Not identified✗CDN Cloudflare✓
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 26 KB (vs 2229 KB first visit). 83 of 84 resources are served from browser cache, saving 0.51g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.52g)
First visit
2229 KB
Repeat visit
26 KB
99% reduction on repeat visits
Saving 0.51g CO2 per returning visitor
83 resources served from cache · 1 resources re-downloaded
Image Optimization2 images, 862 KB total, 430 KB wastedINFO
Image Optimization
2 images, 862 KB total, 430 KB wasted
Image Optimization Audit
Total Images
2
Total Size
862 KB
Oversized
1
Wasted
430 KB
1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.