This document discusses how web personalization can boost business performance. It recommends testing different page elements, like product images or price displays, to optimize user experience and conversions. Testing small changes can increase engagement, sales, and acquire new customers. The author provides an example of how their company Belstaff used testing and personalization to improve mobile experiences, highlight deals, and increase email signups. They plan future tests to localize content and match online and offline customer profiles. Personalization helps keep up with changing user needs and sidesteps long development cycles.