In this article we explain how we at YOOX NET-A-PORTER optimized the Chloé website for a couple of Core Web Vitals: Largest Contentful Paint (LCP) and Cumulative Layout Shift (CLS). Web vitalsWeb Vitals is an initiative by Google to provide unified guidance for quality signals that are essential to delivering a great user experience on the web. Core Web VitalsCore Web Vitals are the subset of Web