https://Retelit.it
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 LoadAction2.08g CO2 per viewFIX
CO2 Per Page Load
Action2.08g CO2 per view
2.08g CO2 per view
Critical::
2.08g CO2 per page view
This page transfers 7.3 MB, producing an estimated 2.08g 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: 2.08g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 249.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 249.6 kg of CO2 annually — equivalent to charging 31200 smartphones.
2.08g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 7.3 MB
Your site
2.08g
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: 20.8 kg · Annual: 249.6 kg · ≈ 31200 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::
2.08g 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
2.08g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 247% more
vs Target 316% more
CWeb Font Weight VariantsAction18 font weights loaded across 1 famil(y/ies)REVIEW
Web Font Weight Variants
Action18 font weights loaded across 1 famil(y/ies)
18 font weights loaded across 1 famil(y/ies)
Warning::
18 font weights loaded -- likely 100+ KB of unused payload
Loading 18 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: 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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 127 KB (vs 7521 KB first visit). 136 of 139 resources are served from browser cache, saving 2.04g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 2.08g)
First visit
7521 KB
Repeat visit
127 KB
98% reduction on repeat visits
Saving 2.04g CO2 per returning visitor
136 resources served from cache · 3 resources re-downloaded
A+Transfer Efficiency92% efficientPASS
Transfer Efficiency
92% efficient
92% efficient
Info::
Transfer efficiency: 92%
Only 624 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 624 KB (8% of page weight)
Unused JS 624 KB
0.17g unnecessary CO2 per visit
Actual transfer 7521 KB
Theoretical minimum 6896 KB
Potential savings 624 KB (0.17g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization40 images, 6411 KB total, 5074 KB wastedINFO
Image Optimization
40 images, 6411 KB total, 5074 KB wasted
Image Optimization Audit
Total Images
40
Total Size
6411 KB
Oversized
13
Wasted
5074 KB
16 missing dimensions 21 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.