TTFB

Time to First Byte

The time between your browser sending a request to the server and receiving the first response. Slow server, poor hosting, or distant server location increases TTFB. It affects all other metrics too.

Thresholds

≤800ms Good
≤1.8s Medium
>1.8s Poor
≤800ms Good
≤1.8s Medium
>1.8s Poor

Why It Matters?

TTFB is the foundation of all other metrics. If the server is slow, the page can't be fast no matter how optimized it is. Good hosting and CDN usage is critical.

Start Measuring