https://www.presentandperform.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
70
GRADE
C
FIX
1
REVIEW
5
PASS
1
INFO
1
Checks
81 PASS 5 REVIEW 1 FIX
DGreen HostingActionUnknownFIX
Green Hosting
ActionUnknown
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
BCO2 Per Page Load0.62g CO2 per viewREVIEW
CO2 Per Page Load
0.62g CO2 per view
0.62g CO2 per view
Info::
0.62g CO2 per page view
This page transfers 2.2 MB, producing an estimated 0.62g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.11g, end-user device 0.40g.
Got: 0.62g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 74.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 74.7 kg of CO2 annually — equivalent to charging 9333 smartphones.
0.62g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 50% of websites
Sustainable Web Design model v4 · Page size: 2.2 MB
Your site
0.62g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.12g
Network
0.11g
End-user device
0.40g
At 10,000 monthly views: Monthly: 6.2 kg · Annual: 74.7 kg · ≈ 9333 smartphone charges
BCarbon Budget50th percentileREVIEW
Carbon Budget
50th percentile
50th percentile
Warning::
0.62g CO2 — above the median website (0.60g)
Heavier than an estimated 50% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 50th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.62g
50th percentile
Cleaner than 50% of websites
✗ Above the median website
vs Median 4% more
vs Target 24% more
CTransfer EfficiencyAction74% efficientREVIEW
Transfer Efficiency
Action74% efficient
74% efficient
Warning::
Transfer efficiency: 74%
An estimated 592 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 592 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.
Total waste: 592 KB (26% of page weight)
Unused JS 592 KB
0.16g unnecessary CO2 per visit
Actual transfer 2249 KB
Theoretical minimum 1657 KB
Potential savings 592 KB (0.16g CO2)
See Deep Analysis sections above for specific optimizations.
CWeb Font Weight VariantsAction9 font weights loaded across 1 famil(y/ies)REVIEW
Web Font Weight Variants
Action9 font weights loaded across 1 famil(y/ies)
9 font weights loaded across 1 famil(y/ies)
Warning::
9 font weights loaded -- likely 100+ KB of unused payload
Loading 9 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: Lora.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 48 KB (vs 2249 KB first visit). 86 of 88 resources are served from browser cache, saving 0.61g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.62g)
First visit
2249 KB
Repeat visit
48 KB
98% reduction on repeat visits
Saving 0.61g CO2 per returning visitor
86 resources served from cache · 2 resources re-downloaded
Image Optimization50 images, 603 KB total, 18 KB wastedINFO
Image Optimization
50 images, 603 KB total, 18 KB wasted
Image Optimization Audit
Total Images
50
Total Size
603 KB
Oversized
1
Wasted
18 KB
47 missing dimensions 46 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.