https://azratings.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
77
GRADE
C
FIX
1
REVIEW
2
PASS
4
INFO
1
Checks
84 PASS 2 REVIEW 1 FIX
DTransfer EfficiencyAction54% efficientFIX
Transfer Efficiency
Action54% efficient
54% efficient
Warning::
Transfer efficiency: 54%
An estimated 628 KB (46%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 628 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
Total waste: 628 KB (46% of page weight)
Unused JS 628 KB
0.15g unnecessary CO2 per visit
Actual transfer 1378 KB
Theoretical minimum 750 KB
Potential savings 628 KB (0.15g CO2)
See Deep Analysis sections above for specific optimizations.
CWeb Font Weight VariantsAction38 font weights loaded across 7 famil(y/ies)REVIEW
Web Font Weight Variants
Action38 font weights loaded across 7 famil(y/ies)
38 font weights loaded across 7 famil(y/ies)
Warning::
38 font weights loaded -- likely 100+ KB of unused payload
Loading 38 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: Archivo, Google%20Sans%20Text%3A400%2C500, Google%20Sans%20Text%3A400%2C500%2C700, Google%20Sans%3A400, Google%20Sans%3A700, Google%20Symbols%3Aopsz%2Cwght%2CFILL%2CGRAD%4020..48%2C100..700%2C0..1%2C-50..200, Open Sans.
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
ACO2 Per Page Load0.32g CO2 per viewPASS
CO2 Per Page Load
0.32g CO2 per view
0.32g CO2 per view
Info::
0.32g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.32g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.24g.
Got: 0.32g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 38.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 38.2 kg of CO2 annually — equivalent to charging 4779 smartphones.
Info::
Green hosting reduces data center emissions
0.32g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 79% of websites
Sustainable Web Design model v4 · Page size: 1.3 MB
Your site
0.32g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.07g
End-user device
0.24g
At 10,000 monthly views: Monthly: 3.2 kg · Annual: 38.2 kg · ≈ 4779 smartphone charges
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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 30 KB (vs 1378 KB first visit). 48 of 49 resources are served from browser cache, saving 0.31g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.32g)
First visit
1378 KB
Repeat visit
30 KB
98% reduction on repeat visits
Saving 0.31g CO2 per returning visitor
48 resources served from cache · 1 resources re-downloaded
ACarbon Budget21th percentilePASS
Carbon Budget
21th percentile
21th percentile
Info::
0.32g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 79% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 21th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.32g
21st percentile
Cleaner than 79% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 47% cleaner ✓
vs Target 36% cleaner ✓
Image Optimization1 images, 2 KB total, 0 KB wastedINFO
Image Optimization
1 images, 2 KB total, 0 KB wasted
Image Optimization Audit
Total Images
1
Total Size
2 KB
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.