https://herotel.com
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
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
FCO2 Per Page LoadAction2.18g CO2 per viewFIX
CO2 Per Page Load
Action2.18g CO2 per view
2.18g CO2 per view
Critical::
2.18g CO2 per page view
This page transfers 9.2 MB, producing an estimated 2.18g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.45g, end-user device 1.67g.
Got: 2.18g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 261.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 261.2 kg of CO2 annually — equivalent to charging 32649 smartphones.
Info::
Green hosting reduces data center emissions
2.18g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 9.2 MB
Your site
2.18g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.05g
Network
0.45g
End-user device
1.67g
At 10,000 monthly views: Monthly: 21.8 kg · Annual: 261.2 kg · ≈ 32649 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.18g 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
2.18g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 263% more
vs Target 335% more
BTransfer Efficiency78% efficientREVIEW
Transfer Efficiency
78% efficient
78% efficient
Info::
Transfer efficiency: 78%
An estimated 2043 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2043 KB of unused JavaScript. This wasted data produces 0.47g of unnecessary CO2 per page view.
Total waste: 2043 KB (22% of page weight)
Unused JS 2043 KB
0.47g unnecessary CO2 per visit
Actual transfer 9416 KB
Theoretical minimum 7373 KB
Potential savings 2043 KB (0.47g CO2)
See Deep Analysis sections above for specific optimizations.
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
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.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudways, CDN: Cloudflare
Info::
Cloudways: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Cloudways✓CDN Cloudflare✓
Cloudways: Verified by the Green Web Foundation
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 296 KB (vs 9416 KB first visit). 204 of 205 resources are served from browser cache, saving 2.11g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 2.18g)
First visit
9416 KB
Repeat visit
296 KB
97% reduction on repeat visits
Saving 2.11g CO2 per returning visitor
204 resources served from cache · 1 resources re-downloaded
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: Cloudflare
Image Optimization72 images, 973 KB total, 134 KB wastedINFO
Image Optimization
72 images, 973 KB total, 134 KB wasted
Image Optimization Audit
Total Images
72
Total Size
973 KB
Oversized
11
Wasted
134 KB
3 missing dimensions 7 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.