Time to First Byte
2 days ago
- #web performance
- #TTFB
- #optimization
- TTFB (Time To First Byte) measures the time from a resource request to the first byte of response arrival.
- TTFB includes phases like redirect time, DNS lookup, connection setup, and TLS negotiation.
- Early Hints (103 status code) can affect TTFB measurements as they count as the first bytes.
- A good TTFB score is 0.8 seconds or less to ensure optimal user experience metrics like FCP and LCP.
- TTFB can be measured using tools like Chrome DevTools, WebPageTest, or JavaScript APIs like Navigation Timing and Resource Timing.
- Improving TTFB involves reducing latency in connection setup and backend processing.