https://peakhealthandfitness.co.uk
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 LoadAction1.05g CO2 per viewFIX
CO2 Per Page Load
Action1.05g CO2 per view
1.05g CO2 per view
Warning::
1.05g CO2 per page view
This page transfers 4.4 MB, producing an estimated 1.05g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.22g, end-user device 0.81g.
Got: 1.05g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 126.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 126.3 kg of CO2 annually — equivalent to charging 15788 smartphones.
Info::
Green hosting reduces data center emissions
1.05g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 38% of websites
Sustainable Web Design model v4 · Page size: 4.4 MB
Your site
1.05g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.22g
End-user device
0.81g
At 10,000 monthly views: Monthly: 10.5 kg · Annual: 126.3 kg · ≈ 15788 smartphone charges
DCarbon BudgetAction62th percentileFIX
Carbon Budget
Action62th percentile
62th percentile
Warning::
1.05g CO2 — above the median website (0.60g)
Heavier than an estimated 38% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 62th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.05g
62nd percentile
Cleaner than 38% of websites
✗ Above the median website
vs Median 75% more
vs Target 111% more
BTransfer Efficiency88% efficientREVIEW
Transfer Efficiency
88% efficient
88% efficient
Info::
Transfer efficiency: 88%
An estimated 551 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 551 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.
Total waste: 551 KB (12% of page weight)
Unused JS 551 KB
0.13g unnecessary CO2 per visit
Actual transfer 4553 KB
Theoretical minimum 4002 KB
Potential savings 551 KB (0.13g 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.
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
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Not identified✗CDN Cloudflare✓
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 130 KB (vs 4553 KB first visit). 378 of 386 resources are served from browser cache, saving 1.02g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.05g)
First visit
4553 KB
Repeat visit
130 KB
97% reduction on repeat visits
Saving 1.02g CO2 per returning visitor
378 resources served from cache · 8 resources re-downloaded
Image Optimization71 images, 698 KB total, 28 KB wastedINFO
Image Optimization
71 images, 698 KB total, 28 KB wasted
Image Optimization Audit
Total Images
71
Total Size
698 KB
Oversized
4
Wasted
28 KB
5 missing dimensions 1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.