https://key-hub.ru
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
69
GRADE
D
FIX
3
REVIEW
3
PASS
1
INFO
1
Checks
81 PASS 3 REVIEW 3 FIX
DCO2 Per Page LoadAction0.95g CO2 per viewFIX
CO2 Per Page Load
Action0.95g CO2 per view
0.95g CO2 per view
Info::
0.95g CO2 per page view
This page transfers 3.3 MB, producing an estimated 0.95g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.18g, network 0.16g, end-user device 0.61g.
Got: 0.95g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 113.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 113.8 kg of CO2 annually — equivalent to charging 14220 smartphones.
0.95g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 41% of websites
Sustainable Web Design model v4 · Page size: 3.3 MB
Your site
0.95g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.18g
Network
0.16g
End-user device
0.61g
At 10,000 monthly views: Monthly: 9.5 kg · Annual: 113.8 kg · ≈ 14220 smartphone charges
DGreen HostingActionUnknownFIX
Green Hosting
ActionUnknown
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
DCarbon BudgetAction59th percentileFIX
Carbon Budget
Action59th percentile
59th percentile
Warning::
0.95g CO2 — above the median website (0.60g)
Heavier than an estimated 41% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 59th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.95g
59th percentile
Cleaner than 41% of websites
✗ Above the median website
vs Median 58% more
vs Target 90% more
BTransfer Efficiency88% efficientREVIEW
Transfer Efficiency
88% efficient
88% efficient
Info::
Transfer efficiency: 88%
An estimated 402 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 402 KB of unused JavaScript. This wasted data produces 0.11g of unnecessary CO2 per page view.
Total waste: 402 KB (12% of page weight)
Unused JS 402 KB
0.11g unnecessary CO2 per visit
Actual transfer 3428 KB
Theoretical minimum 3025 KB
Potential savings 402 KB (0.11g CO2)
See Deep Analysis sections above for specific optimizations.
BWeb Font Weight Variants5 font weights loaded across 2 famil(y/ies)REVIEW
Web Font Weight Variants
5 font weights loaded across 2 famil(y/ies)
5 font weights loaded across 2 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: Inter, Roboto%3A400%2C400i%2C700.
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 48 KB (vs 3428 KB first visit). 143 of 145 resources are served from browser cache, saving 0.93g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.95g)
First visit
3428 KB
Repeat visit
48 KB
99% reduction on repeat visits
Saving 0.93g CO2 per returning visitor
143 resources served from cache · 2 resources re-downloaded
Image Optimization77 images, 2007 KB total, 1315 KB wastedINFO
Image Optimization
77 images, 2007 KB total, 1315 KB wasted
Image Optimization Audit
Total Images
77
Total Size
2007 KB
Oversized
21
Wasted
1315 KB
41 missing dimensions 42 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.