https://www.ferdowsspa.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
79
GRADE
C
FIX
1
REVIEW
4
PASS
2
INFO
1
Checks
82 PASS 4 REVIEW 1 FIX
DCarbon BudgetAction52th percentileFIX
Carbon Budget
Action52th percentile
52th percentile
Warning::
0.69g CO2 — above the median website (0.60g)
Heavier than an estimated 48% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 52th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.69g
52nd percentile
Cleaner than 48% of websites
✗ Above the median website
vs Median 16% more
vs Target 39% more
BCO2 Per Page Load0.69g CO2 per viewREVIEW
CO2 Per Page Load
0.69g CO2 per view
0.69g CO2 per view
Info::
0.69g CO2 per page view
This page transfers 2.9 MB, producing an estimated 0.69g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.14g, end-user device 0.53g.
Got: 0.69g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 83.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 83.3 kg of CO2 annually — equivalent to charging 10411 smartphones.
Info::
Green hosting reduces data center emissions
0.69g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 48% of websites
Sustainable Web Design model v4 · Page size: 2.9 MB
Your site
0.69g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.14g
End-user device
0.53g
At 10,000 monthly views: Monthly: 6.9 kg · Annual: 83.3 kg · ≈ 10411 smartphone charges
BTransfer Efficiency89% efficientREVIEW
Transfer Efficiency
89% efficient
89% efficient
Info::
Transfer efficiency: 89%
An estimated 315 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 315 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
Total waste: 315 KB (11% of page weight)
Unused JS 315 KB
0.07g unnecessary CO2 per visit
Actual transfer 3003 KB
Theoretical minimum 2687 KB
Potential savings 315 KB (0.07g CO2)
See Deep Analysis sections above for specific optimizations.
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 Weight93% cachedPASS
Repeat Visit Weight
93% cached
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 205 KB (vs 3003 KB first visit). 257 of 262 resources are served from browser cache, saving 0.65g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 0.69g)
First visit
3003 KB
Repeat visit
205 KB
93% reduction on repeat visits
Saving 0.65g CO2 per returning visitor
257 resources served from cache · 5 resources re-downloaded
Image Optimization30 images, 923 KB total, 0 KB wastedINFO
Image Optimization
30 images, 923 KB total, 0 KB wasted
Image Optimization Audit
Total Images
30
Total Size
923 KB
12 missing dimensions 14 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.