Implementing lazy loading for images can improve performance, user experience, and Core Web Vitals such as Cumulative Layout Shift and Largest Contentful Paint. Lazy loading instructs the browser to load resources only when they are needed, preventing unnecessary data downloads and speeding up page load times. However, it's essential to carefully consider which images to lazy load, as loading images above the fold can negatively affect LCP scores. Adding width and height attributes to image elements can also prevent Cumulative Layout Shift for lazy loaded images. To monitor performance impacts of lazy loading, Sentry's JavaScript Browser SDK can automatically collect Core Web Vitals and send custom metrics. Configuring alerts in Sentry allows teams to quickly identify poor performance issues without sacrificing development time or CI/CD resources.