Largest Contentful Paint
Largest Contentful Paint (LCP) measures the time until the largest visible element in the viewport is fully loaded and rendered. This metric evaluates when a page's main content becomes visible to users. An LCP under 2.5 seconds is considered a good score and directly influences Load Time perception as well as Google ranking.
Why is LCP relevant?
LCP is a central Core Web Vitals metric that influences perceived loading speed. A poor LCP score signals slow content to users and can negatively affect the PageSpeed rating. Together with First Contentful Paint and Cumulative Layout Shift , LCP describes the overall quality of the initial page build.
Typical causes of poor LCP
Large hero images without optimization, blocking CSS or JavaScript files, and slow server response times can significantly worsen LCP. Inefficient Rendering or missing prioritization through Critical CSS also have a negative impact.
Technical optimization measures
Optimized image formats, clean caching strategies, and a structured Build Process significantly improve LCP. Additionally, efficient Caching and reduced server response times help deliver the main content faster.
Practical perspective
On btech-solutions.eu, the LCP element is the hero area with background image. We optimize LCP through three concrete measures: the hero image is prioritized as WebP with a preload link in the HTML head, Server-Side Rendering delivers the complete HTML response without client-rendering delay, and Critical CSS is inlined so no stylesheet blocks the render start. Result: LCP under 1.5 seconds in the Lighthouse lab and under 2.0 seconds in field data.