Google's Web Vitals initiative is designed to establish a universal set of quality signals for measuring user experience across the web, making it accessible for website owners to assess site performance without needing extensive technical expertise. The initiative focuses on three primary metrics, known as Core Web Vitals: Cumulative Layout Shift (CLS), Largest Contentful Paint (LCP), and First Input Delay (FID), which are used to evaluate the visual stability, loading performance, and interactivity of web pages. Tools such as Chrome User Experience Report, PageSpeed Insights, and Lighthouse are available to monitor these metrics, and specific challenges and solutions for measuring and optimizing these in single-page applications (SPAs) are discussed. The article provides examples of how these metrics apply to SPAs, illustrating the complexities of maintaining optimal user experience in dynamic web environments. As Web Vitals continue to evolve, they are expected to play an increasingly significant role in Google's page ranking algorithms, emphasizing the importance of these metrics in modern web development.