https://atl30309.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
74
GRADE
C
FIX
1
REVIEW
3
PASS
3
INFO
1
Checks
83 PASS 3 REVIEW 1 FIX
FTransfer EfficiencyAction37% efficientFIX
Transfer Efficiency
Action37% efficient
37% efficient
Critical::
Transfer efficiency: 37%
An estimated 1296 KB (63%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1296 KB of unused JavaScript. This wasted data produces 0.30g of unnecessary CO2 per page view.
Total waste: 1296 KB (63% of page weight)
Unused JS 1296 KB
0.30g unnecessary CO2 per visit
Actual transfer 2058 KB
Theoretical minimum 761 KB
Potential savings 1296 KB (0.30g CO2)
See Deep Analysis sections above for specific optimizations.
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Hetzner Online GmbH uses renewable energy
Info::
Hetzner Online GmbH: Verified by the Green Web Foundation
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 Hetzner Online GmbH✓CDN Not identified✗
Hetzner Online GmbH: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BCarbon Budget37th percentileREVIEW
Carbon Budget
37th percentile
37th percentile
Info::
0.48g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 63% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 37th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.48g
37th percentile
Cleaner than 63% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 21% cleaner ✓
vs Target 5% cleaner ✓
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
ACO2 Per Page Load0.48g CO2 per viewPASS
CO2 Per Page Load
0.48g CO2 per view
0.48g CO2 per view
Info::
0.48g CO2 per page view
This page transfers 2.0 MB, producing an estimated 0.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.37g.
Got: 0.48g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 57.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 57.1 kg of CO2 annually — equivalent to charging 7136 smartphones.
Info::
Green hosting reduces data center emissions
0.48g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 63% of websites
Sustainable Web Design model v4 · Page size: 2.0 MB
Your site
0.48g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.10g
End-user device
0.37g
At 10,000 monthly views: Monthly: 4.8 kg · Annual: 57.1 kg · ≈ 7136 smartphone charges
A+Repeat Visit Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 3 KB (vs 2058 KB first visit). 34 of 36 resources are served from browser cache, saving 0.48g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.48g)
First visit
2058 KB
Repeat visit
3 KB
100% reduction on repeat visits
Saving 0.48g CO2 per returning visitor
34 resources served from cache · 2 resources re-downloaded
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Hetzner Online GmbH
Image Optimization6 images, 3 KB total, 0 KB wastedINFO
Image Optimization
6 images, 3 KB total, 0 KB wasted
Image Optimization Audit
Total Images
6
Total Size
3 KB
6 missing alt text
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.