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Time to First Byte (TTFB)

Time to First Byte measures the duration from when a user makes an HTTP request to when the first byte of response data is received by the browser, indicating server responsiveness.

Why Time to First Byte (TTFB) Matters

TTFB affects all other performance metrics since no content can load until the server responds. High TTFB (over 800ms) can negatively impact LCP, FCP, and overall user experience, requiring server optimization.

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