First Contentful Paint
First Contentful Paint (FCP) is a web performance metric that measures the time from when the page starts loading to when any part of the page's content is rendered on the screen. It indicates when users first see something meaningful, such as text, images, or non-white canvas elements, providing a key perception of loading speed. FCP is part of the Core Web Vitals, a set of metrics Google uses to assess user experience for search ranking.
Developers should learn and optimize for FCP because it directly impacts user perception of site speed and engagement, with slow FCP leading to higher bounce rates. It is crucial for improving SEO, as Google uses Core Web Vitals like FCP in its ranking algorithms. Use cases include performance audits for e-commerce sites, blogs, and any web application where fast initial rendering enhances user satisfaction and conversion rates.