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Time to First Byte (TTFB) is a foundational web performance metric that precedes every other mean... Time to First Byte (TTFB) is a foundational web performance metric that precedes every other meaningful user experience metric such as First Contentful Paint (FCP) and Largest Contentful Paint (LCP). This means that high TTFB values add time to the metrics that follow it. It's recommended that your server responds to navigation requests quickly enough so that the 75th percentile of users experienc