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https://nelgossip.it

Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
86
GRADE
B
FIX
1
REVIEW
3
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 3 REVIEW 1 FIX
D
Green Hosting
Action
Unknown
FIX
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

B
Transfer Efficiency
90% efficient
REVIEW
90% efficient
Info::
Transfer efficiency: 90%
An estimated 73 KB (10%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 73 KB of unused JavaScript. This wasted data produces 0.02g of unnecessary CO2 per page view.
90% efficient

Total waste: 73 KB (10% of page weight)

Unused JS 73 KB

0.02g unnecessary CO2 per visit

Actual transfer 729 KB
Theoretical minimum 655 KB
Potential savings 73 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

B
Web Font Weight Variants
No detectable Google Fonts weights
REVIEW
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
CO2 Per Page Load
0.20g CO2 per view
PASS
0.20g CO2 per view
Info::
0.20g CO2 per page view
This page transfers 0.7 MB, producing an estimated 0.20g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.03g, end-user device 0.13g.
Got: 0.20g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 24.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 24.2 kg of CO2 annually — equivalent to charging 3024 smartphones.

0.20g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.7 MB

Your site
0.20g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.03g
End-user device
0.13g
At 10,000 monthly views: Monthly: 2.0 kg · Annual: 24.2 kg · ≈ 3024 smartphone charges
A+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 24 KB (vs 729 KB first visit). 44 of 45 resources are served from browser cache, saving 0.19g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.20g)
First visit
729 KB
Repeat visit
24 KB

97% reduction on repeat visits

Saving 0.19g CO2 per returning visitor

44 resources served from cache · 1 resources re-downloaded

A+
Carbon Budget
10th percentile
PASS
10th percentile
Info::
0.20g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.20g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 66% cleaner ✓
vs Target 60% cleaner ✓
Image Optimization
67 images, 53 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

67

Total Size

53 KB

4 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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