http://www.valera.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
3
PASS
1
INFO
1
Checks
81 PASS 3 REVIEW 3 FIX
DCO2 Per Page LoadAction1.15g CO2 per viewFIX
CO2 Per Page Load
Action1.15g CO2 per view
1.15g CO2 per view
Warning::
1.15g CO2 per page view
This page transfers 4.1 MB, producing an estimated 1.15g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.21g, network 0.20g, end-user device 0.74g.
Got: 1.15g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 137.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 137.8 kg of CO2 annually — equivalent to charging 17230 smartphones.
1.15g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 35% of websites
Sustainable Web Design model v4 · Page size: 4.1 MB
Your site
1.15g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.21g
Network
0.20g
End-user device
0.74g
At 10,000 monthly views: Monthly: 11.5 kg · Annual: 137.8 kg · ≈ 17230 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 Amazon Web Services✗CDN Shopify✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
DCarbon BudgetAction65th percentileFIX
Carbon Budget
Action65th percentile
65th percentile
Warning::
1.15g CO2 — above the median website (0.60g)
Heavier than an estimated 35% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 65th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.15g
65th percentile
Cleaner than 35% of websites
✗ Above the median website
vs Median 91% more
vs Target 130% more
BTransfer Efficiency87% efficientREVIEW
Transfer Efficiency
87% efficient
87% efficient
Info::
Transfer efficiency: 87%
An estimated 550 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 550 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
Total waste: 550 KB (13% of page weight)
Unused JS 550 KB
0.15g unnecessary CO2 per visit
Actual transfer 4153 KB
Theoretical minimum 3603 KB
Potential savings 550 KB (0.15g 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
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 97 KB (vs 4153 KB first visit). 279 of 281 resources are served from browser cache, saving 1.12g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.15g)
First visit
4153 KB
Repeat visit
97 KB
98% reduction on repeat visits
Saving 1.12g CO2 per returning visitor
279 resources served from cache · 2 resources re-downloaded
Image Optimization64 images, 250 KB total, 118 KB wastedINFO
Image Optimization
64 images, 250 KB total, 118 KB wasted
Image Optimization Audit
Total Images
64
Total Size
250 KB
Oversized
3
Wasted
118 KB
3 missing alt text 29 missing dimensions 45 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.