https://iheart.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
84
GRADE
B
FIX
0
REVIEW
2
PASS
4
INFO
0
Checks
64 PASS 2 REVIEW
BTransfer Efficiency79% efficientREVIEW
Transfer Efficiency
79% efficient
79% efficient
Info::
Transfer efficiency: 79%
An estimated 341 KB (21%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 341 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.
Total waste: 341 KB (21% of page weight)
Unused JS 341 KB
0.08g unnecessary CO2 per visit
Actual transfer 1658 KB
Theoretical minimum 1317 KB
Potential savings 341 KB (0.08g CO2)
See Deep Analysis sections above for specific optimizations.
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 Load0.38g CO2 per viewPASS
CO2 Per Page Load
0.38g CO2 per view
0.38g CO2 per view
Info::
0.38g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.38g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.29g.
Got: 0.38g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 46.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 46.0 kg of CO2 annually — equivalent to charging 5750 smartphones.
Info::
Green hosting reduces data center emissions
0.38g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 72% of websites
Sustainable Web Design model v4 · Page size: 1.6 MB
Your site
0.38g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.08g
End-user device
0.29g
At 10,000 monthly views: Monthly: 3.8 kg · Annual: 46.0 kg · ≈ 5750 smartphone charges
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Fastly CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Fastly: 100% renewable energy for edge network
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 Fastly✓
Fastly: 100% renewable energy for edge network
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight81% cachedPASS
Repeat Visit Weight
81% cached
81% cached
Info::
81% reduction on repeat visits
Returning visitors download only 319 KB (vs 1658 KB first visit). 130 of 132 resources are served from browser cache, saving 0.31g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 0.38g)
First visit
1658 KB
Repeat visit
319 KB
81% reduction on repeat visits
Saving 0.31g CO2 per returning visitor
130 resources served from cache · 2 resources re-downloaded
ACarbon Budget28th percentilePASS
Carbon Budget
28th percentile
28th percentile
Info::
0.38g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 72% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 28th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.38g
28th percentile
Cleaner than 72% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 36% cleaner ✓
vs Target 23% cleaner ✓
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.