https://www.happygang.org
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
62
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
82 PASS 2 REVIEW 3 FIX
FCO2 Per Page LoadAction2.87g CO2 per viewFIX
CO2 Per Page Load
Action2.87g CO2 per view
2.87g CO2 per view
Critical::
2.87g CO2 per page view
This page transfers 10.1 MB, producing an estimated 2.87g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.53g, network 0.50g, end-user device 1.85g.
Got: 2.87g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 344.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 344.9 kg of CO2 annually — equivalent to charging 43111 smartphones.
2.87g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 10.1 MB
Your site
2.87g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.53g
Network
0.50g
End-user device
1.85g
At 10,000 monthly views: Monthly: 28.7 kg · Annual: 344.9 kg · ≈ 43111 smartphone charges
DGreen HostingActionNot greenFIX
Green Hosting
ActionNot green
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::
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 Next.js✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.87g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
2.87g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 379% more
vs Target 475% more
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.
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
A+Repeat Visit Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 44 KB (vs 10392 KB first visit). 67 of 68 resources are served from browser cache, saving 2.86g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.87g)
First visit
10392 KB
Repeat visit
44 KB
100% reduction on repeat visits
Saving 2.86g CO2 per returning visitor
67 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency100% efficientPASS
Transfer Efficiency
100% efficient
100% efficient
Info::
Transfer efficiency: 100%
Only 46 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 46 KB (0% of page weight)
Unused JS 46 KB
0.01g unnecessary CO2 per visit
Actual transfer 10392 KB
Theoretical minimum 10345 KB
Potential savings 46 KB (0.01g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization200 images, 7238 KB total, 3385 KB wastedINFO
Image Optimization
200 images, 7238 KB total, 3385 KB wasted
Image Optimization Audit
Total Images
200
Total Size
7238 KB
Oversized
36
Wasted
3385 KB
181 missing dimensions 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.