https://com21.co.ke
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
60
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
82 PASS 2 REVIEW 3 FIX
FCO2 Per Page LoadAction2.09g CO2 per viewFIX
CO2 Per Page Load
Action2.09g CO2 per view
2.09g CO2 per view
Critical::
2.09g CO2 per page view
This page transfers 7.4 MB, producing an estimated 2.09g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.39g, network 0.36g, end-user device 1.34g.
Got: 2.09g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 250.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 250.8 kg of CO2 annually — equivalent to charging 31347 smartphones.
2.09g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 7.4 MB
Your site
2.09g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.39g
Network
0.36g
End-user device
1.34g
At 10,000 monthly views: Monthly: 20.9 kg · Annual: 250.8 kg · ≈ 31347 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
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.09g 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
2.09g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 248% more
vs Target 318% more
CWeb Font Weight VariantsAction14 font weights loaded across 2 famil(y/ies)REVIEW
Web Font Weight Variants
Action14 font weights loaded across 2 famil(y/ies)
14 font weights loaded across 2 famil(y/ies)
Warning::
14 font weights loaded -- likely 100+ KB of unused payload
Loading 14 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Dosis, Montserrat.
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 Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 8 KB (vs 7556 KB first visit). 137 of 138 resources are served from browser cache, saving 2.09g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 2.09g)
First visit
7556 KB
Repeat visit
8 KB
100% reduction on repeat visits
Saving 2.09g CO2 per returning visitor
137 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency98% efficientPASS
Transfer Efficiency
98% efficient
98% efficient
Info::
Transfer efficiency: 98%
Only 162 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 162 KB (2% of page weight)
Unused JS 162 KB
0.04g unnecessary CO2 per visit
Actual transfer 7556 KB
Theoretical minimum 7394 KB
Potential savings 162 KB (0.04g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization89 images, 2453 KB total, 172 KB wastedINFO
Image Optimization
89 images, 2453 KB total, 172 KB wasted
Image Optimization Audit
Total Images
89
Total Size
2453 KB
Oversized
1
Wasted
172 KB
1 missing alt text 89 missing dimensions 88 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.