Baymard's comprehensive mobile UX research based on 4,400+ test sessions across 325 leading e-commerce sites. Key insight: mobile users are 5x more likely to abandon tasks on non-optimized sites. The average checkout has 5.1 steps and 11.3 form fields—but contains 23.48 elements when ideally it should have only 12-14.

The research uncovered 1,350+ UX issues resulting in 650+ guidelines. Critical finding: redesigning checkout can boost conversion by 35.26%, representing $260 billion in recoverable losses. 18% of users abandon due to checkout complexity alone. Essential reading for mobile commerce optimization.

Mobile users are 5x more likely to abandon a task if the website isn't optimized for mobile. The average large e-commerce site can boost conversion by 35.26% through checkout redesign.