LCP (Largest Contentful Paint)
LCP is the time it takes for the largest visible element on a page to render on screen - typically the main image or heading.
It is one of the three Core Web Vitals metrics Google uses to measure the real-world perception of website speed. Google recommends an LCP below 2.5 seconds - above that threshold, a website feels slow even to users who could not otherwise say why.
LCP can be improved through several specific measures: prioritizing the main image (`fetchpriority="high"`), omitting unnecessary JavaScript that blocks rendering, and rendering content on the server instead of waiting for client-side JS. That is exactly what happened on bazarfoto.cz - the LCP image was given loading priority and the pages are rendered by the server, so the content is ready before a heavy framework could finish downloading.
We measure it through Lighthouse and real-device data (not just lab conditions) - both published case studies show a specific score, not an estimate.
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