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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
89
GRADE
B
FIX
0
REVIEW
2
PASS
5
INFO
1
Device:
Mobile Desktop
Checks
8
5 PASS 2 REVIEW
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
OpenGSE uses renewable energy
Info::
OpenGSE: 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 OpenGSE✓CDN Not identified✗

OpenGSE: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Web Font Weight Variants
6 font weights loaded across 1 famil(y/ies)
REVIEW
6 font weights loaded across 1 famil(y/ies)
Info::
6 font weights loaded -- review whether all are used
5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: Poppins.
A
CO2 Per Page Load
0.27g CO2 per view
PASS
0.27g CO2 per view
Info::
0.27g CO2 per page view
This page transfers 1.1 MB, producing an estimated 0.27g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.06g, end-user device 0.20g.
Got: 0.27g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 32.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 32.0 kg of CO2 annually — equivalent to charging 3998 smartphones.
Info::
Green hosting reduces data center emissions

0.27g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 84% of websites

Sustainable Web Design model v4 · Page size: 1.1 MB

Your site
0.27g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.06g
End-user device
0.20g
At 10,000 monthly views: Monthly: 2.7 kg · Annual: 32.0 kg · ≈ 3998 smartphone charges
A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 13 KB (vs 1153 KB first visit). 42 of 43 resources are served from browser cache, saving 0.26g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.27g)
First visit
1153 KB
Repeat visit
13 KB

99% reduction on repeat visits

Saving 0.26g CO2 per returning visitor

42 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
16th percentile
PASS
16th percentile
Info::
0.27g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 84% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 16th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.27g

16th percentile

Cleaner than 84% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 56% cleaner ✓
vs Target 47% cleaner ✓
A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
100% efficient
Actual transfer 1153 KB
Theoretical minimum 1153 KB

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

Image Optimization
30 images, 556 KB total, 352 KB wasted
INFO

Image Optimization Audit

Total Images

30

Total Size

556 KB

Oversized

15

Wasted

352 KB

30 missing dimensions 28 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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