helps marketers, SEOs, business leaders, designers, and everybody else involved in website performance select the right metrics to use to optimize their website's speed. Each chapter examines a specific metric, discusses what it measures, why the metric matters and what tactics will help improve that metric. What You'll Learn • The best metrics and tools to help you measure website speed, including Google's Core Web Vitals • How and when to best use each metric • Where each metric fits within the website loading process • How to use each metric to find different ways of improving website speed Non-technical audience, including marketers, SEOs, designers, and UX professionals.