https://sau.int
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
59
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
82 PASS 2 REVIEW 3 FIX
FCO2 Per Page LoadAction12.68g CO2 per viewFIX
CO2 Per Page Load
Action12.68g CO2 per view
12.68g CO2 per view
Critical::
12.68g CO2 per page view
This page transfers 44.8 MB, producing an estimated 12.68g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 2.35g, network 2.19g, end-user device 8.14g.
Got: 12.68g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1521.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1521.2 kg of CO2 annually — equivalent to charging 190153 smartphones.
12.68g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 44.8 MB
Your site
12.68g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
2.35g
Network
2.19g
End-user device
8.14g
At 10,000 monthly views: Monthly: 126.8 kg · Annual: 1521.2 kg · ≈ 190153 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 BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
12.68g 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
12.68g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 2013% more
vs Target 2435% more
BWeb Font Weight Variants5 font weights loaded across 4 famil(y/ies)REVIEW
Web Font Weight Variants
5 font weights loaded across 4 famil(y/ies)
5 font weights loaded across 4 famil(y/ies)
Info::
5 font weights loaded -- review whether all are used
5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: PT Sans, Roboto, Source Code Pro, Source Sans 3.
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 Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 390 KB (vs 45837 KB first visit). 131 of 132 resources are served from browser cache, saving 12.57g CO2 per repeat visit.
Info::
Repeat visit: 0.11g CO2 (first visit: 12.68g)
First visit
45837 KB
Repeat visit
390 KB
99% reduction on repeat visits
Saving 12.57g CO2 per returning visitor
131 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency99% efficientPASS
Transfer Efficiency
99% efficient
99% efficient
Info::
Transfer efficiency: 99%
Only 523 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 523 KB (1% of page weight)
Unused JS 523 KB
0.14g unnecessary CO2 per visit
Actual transfer 45837 KB
Theoretical minimum 45314 KB
Potential savings 523 KB (0.14g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization96 images, 34001 KB total, 7596 KB wastedINFO
Image Optimization
96 images, 34001 KB total, 7596 KB wasted
Image Optimization Audit
Total Images
96
Total Size
34001 KB
Oversized
22
Wasted
7596 KB
10 missing alt text 96 missing dimensions 92 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.