https://su.se
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
62
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction5.56g CO2 per viewFIX
CO2 Per Page Load
Action5.56g CO2 per view
5.56g CO2 per view
Critical::
5.56g CO2 per page view
This page transfers 23.5 MB, producing an estimated 5.56g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.14g, network 1.15g, end-user device 4.27g.
Got: 5.56g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 667.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 667.4 kg of CO2 annually — equivalent to charging 83425 smartphones.
Info::
Green hosting reduces data center emissions
5.56g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 23.5 MB
Your site
5.56g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.14g
Network
1.15g
End-user device
4.27g
At 10,000 monthly views: Monthly: 55.6 kg · Annual: 667.4 kg · ≈ 83425 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
5.56g 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
5.56g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 827% more
vs Target 1012% more
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Sitevision AB uses renewable energy
Info::
Sitevision AB: Verified by the Green Web Foundation
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 Sitevision AB✓CDN Not identified✗
Sitevision AB: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 22 KB (vs 24061 KB first visit). 99 of 100 resources are served from browser cache, saving 5.56g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 5.56g)
First visit
24061 KB
Repeat visit
22 KB
100% reduction on repeat visits
Saving 5.56g CO2 per returning visitor
99 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency99% efficientPASS
Transfer Efficiency
99% efficient
99% efficient
Info::
Transfer efficiency: 99%
Only 216 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 216 KB (1% of page weight)
Unused JS 216 KB
0.05g unnecessary CO2 per visit
Actual transfer 24061 KB
Theoretical minimum 23845 KB
Potential savings 216 KB (0.05g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Sitevision AB
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.