Latency Impact on Ecommerce
Page load time has a direct, measurable effect on ecommerce conversion rate. The relationship is non-linear: the first seconds of improvement deliver the largest gains, and performance below 3 seconds is where the catastrophic drop-off occurs.
Conversion Rate by Load Time
| Load Time | Avg Conversion Rate | Bounce Rate Impact | Revenue Index |
|---|---|---|---|
| Under 1s | 4.01% | Minimal | 100 |
| 1s | 3.73% | +10% | 93 |
| 2s | 3.47% | +32% | 86 |
| 3s | 2.50% | +65% | 62 |
| 4s | 1.90% | +90% | 47 |
| 5s | 1.55% | +106% | 38 |
| 6s | 1.35% | +118% | 34 |
| 10s | 0.95% | +150%+ | 24 |
Revenue Index: 100 = ideal performance at under 1 second. Based on aggregated Akamai, Google, and Deloitte research.
Real-World Case Studies
Walmart
Every 1-second improvement in load time increased conversions by 2%.
Significant at Walmart's transaction volume ($600B+ annual revenue).
Source: WalmartLabs engineering blog
COOK (UK)
Reducing page load time by 0.85 seconds increased conversions by 7%.
7% conversion improvement across a major UK meal delivery brand.
Source: WPO Stats case study
AutoAnything
After cutting average page load time in half, sales increased by 12-13%.
Speed improvement directly attributable to revenue increase.
Source: Case study via Portent
Mobify
100ms decrease in homepage load speed led to 1.11% increase in session-based conversion.
For Mobify's clients, that was estimated at $380,000 annual revenue increase.
Source: Mobify research data
Mobile Performance: The Bigger Problem
- 53% of mobile site visitors abandon pages that take longer than 3 seconds to load (Google, Think with Google research).
- Mobile sites load an average 5 to 6 seconds slower than desktop at the same location, amplifying latency impact.
- 70% of online purchases are now initiated on mobile, making mobile performance the primary revenue concern.
- Google's Core Web Vitals LCP benchmark for mobile is 2.5 seconds. Most ecommerce sites fail this target.
- A 0.1s improvement in mobile page speed produces 8.4% lift in retail conversions (Deloitte and Google joint study).
Ecommerce Performance Targets for 2026
Largest Contentful Paint (LCP)
Under 2.5s
Google rating: Good
Interaction to Next Paint (INP)
Under 200ms
Google rating: Good
Cumulative Layout Shift (CLS)
Under 0.1
Google rating: Good