C
Evidence Grade C
Graded
accuracy verified by the review judge
Use with Hedging
Recent
7%
7% -- conversion rate loss per second delay for websites (2025)
Every second of page load delay costs roughly 7% in conversions.
- Estimated as 'roughly 7%'
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
7%
Unit
Percentage
Data Vintage
2025
Entity
Evidence Quality
C
Moderate quality evidence
Useful directional data with some methodological gaps. Treat as indicative rather than definitive -- corroborate before citing in formal research.
Score breakdown
Extraction
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Sources (3)
araptus.com
Primary
Tier C
https://araptus.com/blog/2025/page-speed-seo-ranking ↗
Source Article
Page Speed and SEO: Why Your Slow Site Is | Araptus
The Problem Nobody Wants to Hear
I've built over 300 websites. The single most common reason a site underperforms in search isn't bad content or weak backlinks — it's speed. The site is just slow, and Google notices before your visitors do.
Since Core Web Vitals became a ranking signal in 2021, I've…
Also cited by
2026-09-22
2026-09-29
Original Research
araptus.com
· Original study ↗
Methodology
Blog citing industry research; original study not named
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Suggested hedging: According to limited, single-source data, with unverified sample sizes...
Plain Text
websites: 7% conversion rate loss per second delay. Source: araptus.com (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/conversion-loss-per-second-delay
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<blockquote cite="https://lighthousedata.io/data/conversion-loss-per-second-delay" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>7%</strong> -- conversion rate loss per second delay for websites<br><small>Source: araptus.com (2025) · <a href="https://lighthousedata.io/data/conversion-loss-per-second-delay" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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