https://www.riksbyggen.se
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
78
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
DCO2 Per Page LoadAction1.27g CO2 per viewFIX
CO2 Per Page Load
Action1.27g CO2 per view
1.27g CO2 per view
Warning::
1.27g CO2 per page view
This page transfers 5.4 MB, producing an estimated 1.27g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.26g, end-user device 0.97g.
Got: 1.27g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 152.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 152.3 kg of CO2 annually — equivalent to charging 19038 smartphones.
Info::
Green hosting reduces data center emissions
1.27g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 31% of websites
Sustainable Web Design model v4 · Page size: 5.4 MB
Your site
1.27g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.26g
End-user device
0.97g
At 10,000 monthly views: Monthly: 12.7 kg · Annual: 152.3 kg · ≈ 19038 smartphone charges
DCarbon BudgetAction69th percentileFIX
Carbon Budget
Action69th percentile
69th percentile
Warning::
1.27g CO2 — above the median website (0.60g)
Heavier than an estimated 31% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 69th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.27g
69th percentile
Cleaner than 31% of websites
✗ Above the median website
vs Median 112% more
vs Target 154% more
BTransfer Efficiency86% efficientREVIEW
Transfer Efficiency
86% efficient
86% efficient
Info::
Transfer efficiency: 86%
An estimated 778 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 778 KB of unused JavaScript. This wasted data produces 0.18g of unnecessary CO2 per page view.
Total waste: 778 KB (14% of page weight)
Unused JS 778 KB
0.18g unnecessary CO2 per visit
Actual transfer 5491 KB
Theoretical minimum 4712 KB
Potential savings 778 KB (0.18g 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.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Azure, CDN: Cloudflare
Info::
Azure: Verified by the Green Web Foundation
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 Azure✓CDN Cloudflare✓
Azure: Verified by the Green Web Foundation
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 36 KB (vs 5491 KB first visit). 141 of 144 resources are served from browser cache, saving 1.26g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.27g)
First visit
5491 KB
Repeat visit
36 KB
99% reduction on repeat visits
Saving 1.26g CO2 per returning visitor
141 resources served from cache · 3 resources re-downloaded
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Image Optimization32 images, 201 KB total, 59 KB wastedINFO
Image Optimization
32 images, 201 KB total, 59 KB wasted
Image Optimization Audit
Total Images
32
Total Size
201 KB
Oversized
2
Wasted
59 KB
31 missing dimensions 16 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.