https://roma.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
75
GRADE
C
FIX
2
REVIEW
3
PASS
2
INFO
1
Checks
82 PASS 3 REVIEW 2 FIX
DCO2 Per Page LoadAction0.98g CO2 per viewFIX
CO2 Per Page Load
Action0.98g CO2 per view
0.98g CO2 per view
Info::
0.98g CO2 per page view
This page transfers 4.2 MB, producing an estimated 0.98g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.20g, end-user device 0.76g.
Got: 0.98g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 118.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 118.0 kg of CO2 annually — equivalent to charging 14749 smartphones.
Info::
Green hosting reduces data center emissions
0.98g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 40% of websites
Sustainable Web Design model v4 · Page size: 4.2 MB
Your site
0.98g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.20g
End-user device
0.76g
At 10,000 monthly views: Monthly: 9.8 kg · Annual: 118.0 kg · ≈ 14749 smartphone charges
DCarbon BudgetAction60th percentileFIX
Carbon Budget
Action60th percentile
60th percentile
Warning::
0.98g CO2 — above the median website (0.60g)
Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 60th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.98g
60th percentile
Cleaner than 40% of websites
✗ Above the median website
vs Median 64% more
vs Target 97% more
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Apache HTTP Server uses renewable energy
Info::
Apache HTTP Server: 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 Apache HTTP Server✓CDN Not identified✗
Apache HTTP Server: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BTransfer Efficiency86% efficientREVIEW
Transfer Efficiency
86% efficient
86% efficient
Info::
Transfer efficiency: 86%
An estimated 582 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 582 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.
Total waste: 582 KB (14% of page weight)
Unused JS 582 KB
0.13g unnecessary CO2 per visit
Actual transfer 4254 KB
Theoretical minimum 3671 KB
Potential savings 582 KB (0.13g 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+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 69 KB (vs 4254 KB first visit). 129 of 146 resources are served from browser cache, saving 0.97g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.98g)
First visit
4254 KB
Repeat visit
69 KB
98% reduction on repeat visits
Saving 0.97g CO2 per returning visitor
129 resources served from cache · 17 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: Hetzner Online GmbH
Image Optimization90 images, 7839 KB total, 1572 KB wastedINFO
Image Optimization
90 images, 7839 KB total, 1572 KB wasted
Image Optimization Audit
Total Images
90
Total Size
7839 KB
Oversized
16
Wasted
1572 KB
3 missing alt text 2 missing dimensions 77 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.