https://www.mossandmolt.com/pages/aquarium-sim
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
88
GRADE
B
FIX
0
REVIEW
3
PASS
4
INFO
1
Checks
84 PASS 3 REVIEW
BCO2 Per Page Load0.58g CO2 per viewREVIEW
CO2 Per Page Load
0.58g CO2 per view
0.58g CO2 per view
Info::
0.58g CO2 per page view
This page transfers 2.4 MB, producing an estimated 0.58g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.44g.
Got: 0.58g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 69.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 69.0 kg of CO2 annually — equivalent to charging 8628 smartphones.
Info::
Green hosting reduces data center emissions
0.58g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 53% of websites
Sustainable Web Design model v4 · Page size: 2.4 MB
Your site
0.58g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.12g
End-user device
0.44g
At 10,000 monthly views: Monthly: 5.8 kg · Annual: 69.0 kg · ≈ 8628 smartphone charges
BCarbon Budget47th percentileREVIEW
Carbon Budget
47th percentile
47th percentile
Info::
0.58g CO2 — below the median website (0.60g)
Better than an estimated 53% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 47th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.58g
47th percentile
Cleaner than 53% of websites
✗ Above the median website
vs Median 4% cleaner ✓
vs Target 15% more
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: GoDaddy, CDN: Cloudflare
Info::
GoDaddy: 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 GoDaddy✓CDN Cloudflare✓
GoDaddy: 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 Weight88% cachedPASS
Repeat Visit Weight
88% cached
88% cached
Info::
88% reduction on repeat visits
Returning visitors download only 301 KB (vs 2488 KB first visit). 315 of 320 resources are served from browser cache, saving 0.51g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 0.58g)
First visit
2488 KB
Repeat visit
301 KB
88% reduction on repeat visits
Saving 0.51g CO2 per returning visitor
315 resources served from cache · 5 resources re-downloaded
A+Transfer Efficiency94% efficientPASS
Transfer Efficiency
94% efficient
94% efficient
Info::
Transfer efficiency: 94%
Only 158 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 158 KB (6% of page weight)
Unused JS 158 KB
0.04g unnecessary CO2 per visit
Actual transfer 2488 KB
Theoretical minimum 2330 KB
Potential savings 158 KB (0.04g CO2)
See Deep Analysis sections above for specific optimizations.
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 Optimization27 images, 205 KB total, 0 KB wastedINFO
Image Optimization
27 images, 205 KB total, 0 KB wasted
Image Optimization Audit
Total Images
27
Total Size
205 KB
1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.