https://www.compositebonding.london
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
0
REVIEW
3
PASS
4
INFO
1
Checks
84 PASS 3 REVIEW
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Hetzner Online GmbH uses renewable energy
Info::
Hetzner Online GmbH: 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 Hetzner Online GmbH✓CDN Not identified✗
Hetzner Online GmbH: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BTransfer Efficiency89% efficientREVIEW
Transfer Efficiency
89% efficient
89% efficient
Info::
Transfer efficiency: 89%
An estimated 131 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 131 KB of unused JavaScript. This wasted data produces 0.03g of unnecessary CO2 per page view.
Total waste: 131 KB (11% of page weight)
Unused JS 131 KB
0.03g unnecessary CO2 per visit
Actual transfer 1192 KB
Theoretical minimum 1060 KB
Potential savings 131 KB (0.03g CO2)
See Deep Analysis sections above for specific optimizations.
CWeb Font Weight VariantsAction12 font weights loaded across 3 famil(y/ies)REVIEW
Web Font Weight Variants
Action12 font weights loaded across 3 famil(y/ies)
12 font weights loaded across 3 famil(y/ies)
Warning::
12 font weights loaded -- likely 100+ KB of unused payload
Loading 12 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, Oswald, Poppins.
ACO2 Per Page Load0.28g CO2 per viewPASS
CO2 Per Page Load
0.28g CO2 per view
0.28g CO2 per view
Info::
0.28g CO2 per page view
This page transfers 1.2 MB, producing an estimated 0.28g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.06g, end-user device 0.21g.
Got: 0.28g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 33.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 33.1 kg of CO2 annually — equivalent to charging 4133 smartphones.
Info::
Green hosting reduces data center emissions
0.28g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 83% of websites
Sustainable Web Design model v4 · Page size: 1.2 MB
Your site
0.28g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.06g
End-user device
0.21g
At 10,000 monthly views: Monthly: 2.8 kg · Annual: 33.1 kg · ≈ 4133 smartphone charges
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 7 KB (vs 1192 KB first visit). 58 of 59 resources are served from browser cache, saving 0.27g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.28g)
First visit
1192 KB
Repeat visit
7 KB
99% reduction on repeat visits
Saving 0.27g CO2 per returning visitor
58 resources served from cache · 1 resources re-downloaded
ACarbon Budget17th percentilePASS
Carbon Budget
17th percentile
17th percentile
Info::
0.28g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 83% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 17th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.28g
17th percentile
Cleaner than 83% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 54% cleaner ✓
vs Target 45% cleaner ✓
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: Hetzner Online GmbH
Image Optimization17 images, 521 KB total, 61 KB wastedINFO
Image Optimization
17 images, 521 KB total, 61 KB wasted
Image Optimization Audit
Total Images
17
Total Size
521 KB
Oversized
2
Wasted
61 KB
17 missing dimensions 13 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.