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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
88
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::
Google Cloud uses renewable energy
Info::
Google Cloud: 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 Google Cloud✓CDN Not identified✗

Google Cloud: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

C
Web Font Weight Variants
Action
12 font weights loaded across 3 famil(y/ies)
REVIEW
12 font weights loaded across 3 famil(y/ies)
Warning::
12 font weights loaded -- likely 100+ KB of unused payload
Loading 12 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: JetBrains Mono, Plus Jakarta Sans, Syne.
A
CO2 Per Page Load
0.33g CO2 per view
PASS
0.33g CO2 per view
Info::
0.33g CO2 per page view
This page transfers 1.4 MB, producing an estimated 0.33g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.25g.
Got: 0.33g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 39.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 39.3 kg of CO2 annually — equivalent to charging 4918 smartphones.
Info::
Green hosting reduces data center emissions

0.33g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 78% of websites

Sustainable Web Design model v4 · Page size: 1.4 MB

Your site
0.33g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.07g
End-user device
0.25g
At 10,000 monthly views: Monthly: 3.3 kg · Annual: 39.3 kg · ≈ 4918 smartphone charges
A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 10 KB (vs 1418 KB first visit). 11 of 12 resources are served from browser cache, saving 0.33g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.33g)
First visit
1418 KB
Repeat visit
10 KB

99% reduction on repeat visits

Saving 0.33g CO2 per returning visitor

11 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
22th percentile
PASS
22th percentile
Info::
0.33g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 78% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 22th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.33g

22nd percentile

Cleaner than 78% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 45% cleaner ✓
vs Target 34% cleaner ✓
A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 101 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 101 KB (7% of page weight)

Unused JS 101 KB

0.02g unnecessary CO2 per visit

Actual transfer 1418 KB
Theoretical minimum 1316 KB
Potential savings 101 KB (0.02g CO2)

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
19 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

19

Total Size

0 KB

19 missing dimensions
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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