B
Evidence Grade B
Graded
under review
Safe to Cite
Recent
49%
49% -- share of ecommerce sites over 800ms ttfb threshold for E-commerce sites (mobile) (2025)
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
49%
Unit
Percentage
Data Vintage
2025
Entity
Sample Size
1,565
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
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Iron-Out (iron-out.io)
Primary
Tier B
https://www.iron-out.io/core-web-vitals/ttfb/ ↗
Source Article
Time to First Byte (TTFB): Complete optimisation guide
Time to First Byte (TTFB): Fix the bottleneck slowing everything else
Your server takes 2.3 seconds to respond. During that time, users see a blank screen. Nothing loads. No images, no text, nothing. They're gone before your page even starts rendering. TTFB is the hidden tax on every other metric.
W…
Original Research
Iron-Out (iron-out.io)
· Original study ↗
Methodology
Vendor's own mobile Core Web Vitals benchmark of 1,565 e-commerce sites; measures share of sites with TTFB above the 800ms threshold (median TTFB 787ms), reported as the worst pass rate of any metric tracked. Relevant to SEO/CRO since server response time is a Core Web Vitals ranking signal affecting bounce and conversion. No explicit collection date in source; publication year assumed.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
E-commerce sites (mobile): 49% share of ecommerce sites over 800ms ttfb threshold. Source: Iron-Out (iron-out.io) (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/ecommerce-mobile-ttfb-over-threshold
HTML Embed
<blockquote cite="https://lighthousedata.io/data/ecommerce-mobile-ttfb-over-threshold" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>49%</strong> -- share of ecommerce sites over 800ms ttfb threshold for E-commerce sites (mobile)<br><small>Source: Iron-Out (iron-out.io) (2025) · <a href="https://lighthousedata.io/data/ecommerce-mobile-ttfb-over-threshold" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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