https://parspack.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 LoadAction0.88g CO2 per viewFIX
CO2 Per Page Load
Action0.88g CO2 per view
0.88g CO2 per view
Info::
0.88g CO2 per page view
This page transfers 3.7 MB, producing an estimated 0.88g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.18g, end-user device 0.67g.
Got: 0.88g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 105.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 105.0 kg of CO2 annually — equivalent to charging 13126 smartphones.
Info::
Green hosting reduces data center emissions
0.88g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 43% of websites
Sustainable Web Design model v4 · Page size: 3.7 MB
Your site
0.88g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.18g
End-user device
0.67g
At 10,000 monthly views: Monthly: 8.8 kg · Annual: 105.0 kg · ≈ 13126 smartphone charges
DCarbon BudgetAction57th percentileFIX
Carbon Budget
Action57th percentile
57th percentile
Warning::
0.88g CO2 — above the median website (0.60g)
Heavier than an estimated 43% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 57th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.88g
57th percentile
Cleaner than 43% of websites
✗ Above the median website
vs Median 46% more
vs Target 75% more
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Cloudflare uses renewable energy
Info::
Cloudflare: 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 Cloudflare✓CDN Not identified✗
Cloudflare: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
CTransfer EfficiencyAction72% efficientREVIEW
Transfer Efficiency
Action72% efficient
72% efficient
Warning::
Transfer efficiency: 72%
An estimated 1058 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1058 KB of unused JavaScript. This wasted data produces 0.24g of unnecessary CO2 per page view.
Total waste: 1058 KB (28% of page weight)
Unused JS 1058 KB
0.24g unnecessary CO2 per visit
Actual transfer 3786 KB
Theoretical minimum 2728 KB
Potential savings 1058 KB (0.24g 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 81 KB (vs 3786 KB first visit). 110 of 112 resources are served from browser cache, saving 0.86g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.88g)
First visit
3786 KB
Repeat visit
81 KB
98% reduction on repeat visits
Saving 0.86g CO2 per returning visitor
110 resources served from cache · 2 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 Optimization54 images, 322 KB total, 0 KB wastedINFO
Image Optimization
54 images, 322 KB total, 0 KB wasted
Image Optimization Audit
Total Images
54
Total Size
322 KB
19 missing alt text 13 missing dimensions 47 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.