Largest Contentful Paint (LCP) is a new metric developed by Google to measure how fast the main content of a webpage is displayed to the user, with the goal of improving customer experience and page performance. LCP measures when the largest element visible to the user was rendered, including images, blocks of text, and videos, and is now available in real user monitoring (RUM) tools such as New Relic. To improve LCP, teams can optimize load times, reduce load delays, and improve time to first byte by removing render-blocking resources, rendering LCP elements immediately after resource loading, optimizing resource load time, and improving server-side caching and database configuration. Understanding your best opportunities for improvement is crucial, and using tools like New Relic's browser agent can help track and analyze LCP values. With the increasing importance of page performance and customer experience, LCP has become a vital metric to measure and improve, especially in search engines where it will likely impact how many visitors come to a site.