Page speed impact on conversion measures how faster loading, interaction readiness and visual stability affect e-commerce behavior. This dataset summarizes benchmark reference points for mobile retail conversion, average order value and funnel progression.
Back to the hub: E-commerce Statistics.
This page belongs to the Mobile, UX & Tech silo. For device and UX context, compare it with
mobile share of traffic,
mobile share of revenue,
desktop share of traffic,
desktop share of revenue,
conversion rate by device,
page speed impact on conversion,
Core Web Vitals benchmarks,
mobile checkout friction
and app vs web purchase share.
Benchmarks
Page speed impact on e-commerce conversion
Page speed impact is strongest when measured at page-type level: product listing pages, product detail pages, add-to-cart steps, basket and checkout. Averages are useful, but page-level bottlenecks usually explain the revenue gap.
+8.4%
A Deloitte and Google study observed retail conversion-rate uplift after a 0.1 second mobile speed improvement across measured speed metrics.
+9.2%
The same retail analysis observed higher average order value after faster mobile journeys.
+9.1%
The largest retail funnel progression gain was observed from product detail pages to add-to-basket.
| Benchmark | Observed level | Interpretation |
|---|---|---|
| Mobile retail conversion impact | +8.4% after a 0.1s improvement | Small speed wins can matter when they happen across the full mobile journey, not only on the homepage. |
| Average order value impact | +9.2% after a 0.1s improvement | Speed can support deeper browsing and larger baskets, especially on category and product pages. |
| Product listing to product detail | +3.2% funnel progression | Listing and category pages are often a high-leverage performance target. |
| Product detail to add-to-basket | +9.1% funnel progression | Slow or unstable product pages can directly affect add-to-cart behavior. |
Funnel impact
Where speed usually affects revenue
For e-commerce teams, page speed should not be treated as a generic homepage score. It should be mapped to the shopping journey.
Definition: page speed impact on conversion is the observed change in purchase behavior, funnel progression, revenue per visitor or average order value associated with faster page loading and interaction readiness.
Prioritize pages where shoppers make decisions: category grids, filtered search results, product detail pages, add-to-cart actions, cart pages, payment method loading and checkout validation. A fast blog post is useful, but a slow product page or slow checkout can cost revenue immediately.
Usage
How to use this benchmark
Use the benchmark as a prioritization signal, not as a guaranteed forecast. Start with mobile field data, segment by page type, then compare conversion rate, add-to-cart rate, checkout completion and revenue per visitor before and after performance changes. For paid traffic, evaluate speed by landing page and campaign because slow mobile landing pages can reduce the value of media spend.
Pair this dataset with Core Web Vitals benchmarks and conversion rate by device to separate technical performance from broader device behavior.
Methodology
Methodology note
Measure speed impact with real-user monitoring or field data where possible. Compare equivalent periods, traffic sources, page templates and device segments. Avoid reading a single Lighthouse score as a revenue benchmark: a page can score well in a lab test and still feel slow for real mobile shoppers on weaker devices or networks.
Sources
Sources and notes
Use these sources as directional benchmarks. Device, UX and technology benchmarks should be normalized by market, traffic mix, product category, page type, seasonality and measurement method.
- web.dev / Google: Milliseconds make millions — summary of the Deloitte/Google speed study and mobile retail conversion impact.
- Deloitte: Milliseconds Make Millions — retail, travel, luxury and lead-generation findings from the speed study.
- Google Search Central: Core Web Vitals — Google definitions for user-experience metrics used in search and page-experience context.
Cite this page
How to cite this dataset
E-commerce Page Speed Impact on Conversion. Best For Ecommerce. Updated 2026-05-31. Available at: https://bestforecommerce.com/ecommerce-statistics/mobile-ux-tech/page-speed-impact-on-conversion/