B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
21%
21% -- roi for websites (2025)
Website acceleration led to an estimated 21% improvement in ROI for the examined website.
- Case study/experiment results on a tested website, not guaranteed for all websites
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
21%
Unit
Percentage
Data Vintage
2025
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
95
Source Trust
50
Citation Chain
90
Independence
30
Methodology
45
Freshness
81
Source
Strangeloop
Primary
Tier A
https://www.marketingfacts.nl/berichten/20091119_verhoog_het_rendement_op_online_marketing_met_een_s… ↗
Source Article
Hoeveel impact heeft sitesnelheid op het rendement van online marketing?
Hoeveel impact heeft sitesnelheid op het rendement van online marketing?
Op een langzame site haken bezoekers sneller af. Bezoekers kijken minder, zijn minder tevreden en kopen minder. Iedere professional in de online wereld kan zich hier wel iets bij voorstellen. De grote vraag is echter welke posi…
Original Research
Strangeloop
· Original study ↗
Methodology
A/B test conducted by Strangeloop on various media and e-commerce websites.
Methodology documented
Segmentation
Channelrss_feed
Cite this stat
Plain Text
websites: 21% roi. Source: Strangeloop (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/website-speed-impact-roi-2025
HTML Embed
<blockquote cite="https://lighthousedata.io/data/website-speed-impact-roi-2025" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>21%</strong> -- roi for websites<br><small>Source: Strangeloop (2025) · <a href="https://lighthousedata.io/data/website-speed-impact-roi-2025" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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