https://rcf-community.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
68
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
82 PASS 2 REVIEW 3 FIX
DCO2 Per Page LoadAction1.37g CO2 per viewFIX
CO2 Per Page Load
Action1.37g CO2 per view
1.37g CO2 per view
Warning::
1.37g CO2 per page view
This page transfers 4.8 MB, producing an estimated 1.37g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.25g, network 0.24g, end-user device 0.88g.
Got: 1.37g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 164.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 164.2 kg of CO2 annually — equivalent to charging 20526 smartphones.
1.37g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 29% of websites
Sustainable Web Design model v4 · Page size: 4.8 MB
Your site
1.37g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.25g
Network
0.24g
End-user device
0.88g
At 10,000 monthly views: Monthly: 13.7 kg · Annual: 164.2 kg · ≈ 20526 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 Apache HTTP Server✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
FCarbon BudgetAction71th percentileFIX
Carbon Budget
Action71th percentile
71th percentile
Warning::
1.37g CO2 — above the median website (0.60g)
Heavier than an estimated 29% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 71th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.37g
71st percentile
Cleaner than 29% of websites
✗ Above the median website
vs Median 128% more
vs Target 174% 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 7 KB (vs 4948 KB first visit). 128 of 131 resources are served from browser cache, saving 1.37g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.37g)
First visit
4948 KB
Repeat visit
7 KB
100% reduction on repeat visits
Saving 1.37g CO2 per returning visitor
128 resources served from cache · 3 resources re-downloaded
A+Transfer Efficiency100% efficientPASS
Transfer Efficiency
100% efficient
100% efficient
Info::
Transfer efficiency: 100%
Only 22 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 22 KB (0% of page weight)
Unused JS 22 KB
0.01g unnecessary CO2 per visit
Actual transfer 4948 KB
Theoretical minimum 4925 KB
Potential savings 22 KB (0.01g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization2 images, 259 KB total, 192 KB wastedINFO
Image Optimization
2 images, 259 KB total, 192 KB wasted
Image Optimization Audit
Total Images
2
Total Size
259 KB
Oversized
1
Wasted
192 KB
1 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.