https://sensitivestones.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
67
GRADE
D
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
FCO2 Per Page LoadAction5.12g CO2 per viewFIX
CO2 Per Page Load
Action5.12g CO2 per view
5.12g CO2 per view
Critical::
5.12g CO2 per page view
This page transfers 21.6 MB, producing an estimated 5.12g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.13g, network 1.06g, end-user device 3.93g.
Got: 5.12g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 614.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 614.5 kg of CO2 annually — equivalent to charging 76809 smartphones.
Info::
Green hosting reduces data center emissions
5.12g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 21.6 MB
Your site
5.12g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.13g
Network
1.06g
End-user device
3.93g
At 10,000 monthly views: Monthly: 51.2 kg · Annual: 614.5 kg · ≈ 76809 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
5.12g 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
5.12g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 753% more
vs Target 924% 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
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 Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 111 KB (vs 22153 KB first visit). 103 of 104 resources are served from browser cache, saving 5.09g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 5.12g)
First visit
22153 KB
Repeat visit
111 KB
99% reduction on repeat visits
Saving 5.09g CO2 per returning visitor
103 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency100% efficientPASS
Transfer Efficiency
100% efficient
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
Actual transfer 22153 KB
Theoretical minimum 22153 KB
See Deep Analysis sections above for specific optimizations.
Image Optimization72 images, 9803 KB total, 3924 KB wastedINFO
Image Optimization
72 images, 9803 KB total, 3924 KB wasted
Image Optimization Audit
Total Images
72
Total Size
9803 KB
Oversized
21
Wasted
3924 KB
8 missing alt text 53 missing dimensions 5 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.