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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
77
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
8
3 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.08g CO2 per view
FIX
1.08g CO2 per view
Warning::
1.08g CO2 per page view
This page transfers 4.6 MB, producing an estimated 1.08g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.22g, end-user device 0.83g.
Got: 1.08g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 130.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 130.1 kg of CO2 annually — equivalent to charging 16262 smartphones.
Info::
Green hosting reduces data center emissions

1.08g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 37% of websites

Sustainable Web Design model v4 · Page size: 4.6 MB

Your site
1.08g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.22g
End-user device
0.83g
At 10,000 monthly views: Monthly: 10.8 kg · Annual: 130.1 kg · ≈ 16262 smartphone charges
D
Carbon Budget
Action
63th percentile
FIX
63th percentile
Warning::
1.08g CO2 — above the median website (0.60g)
Heavier than an estimated 37% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 63th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.08g

63rd percentile

Cleaner than 37% of websites

✗ Above the median website

vs Median 81% more
vs Target 117% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Hetzner Online GmbH uses renewable energy
Info::
Hetzner Online GmbH: 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 Hetzner Online GmbH✓CDN Not identified✗

Hetzner Online GmbH: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Web Font Weight Variants
5 font weights loaded across 1 famil(y/ies)
REVIEW
5 font weights loaded across 1 famil(y/ies)
Info::
5 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: Inter.
A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 11 KB (vs 4690 KB first visit). 40 of 41 resources are served from browser cache, saving 1.08g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.08g)
First visit
4690 KB
Repeat visit
11 KB

100% reduction on repeat visits

Saving 1.08g CO2 per returning visitor

40 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
99% efficient
PASS
99% efficient
Info::
Transfer efficiency: 99%
Only 59 KB of potential savings identified. Your page is well-optimized for size.
99% efficient

Total waste: 59 KB (1% of page weight)

Unused JS 59 KB

0.01g unnecessary CO2 per visit

Actual transfer 4690 KB
Theoretical minimum 4630 KB
Potential savings 59 KB (0.01g 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: Hetzner Online GmbH

Image Optimization
6 images, 432 KB total, 356 KB wasted
INFO

Image Optimization Audit

Total Images

6

Total Size

432 KB

Oversized

4

Wasted

356 KB

6 missing dimensions 4 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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