TTFB (Time to First Byte) is crucial for web performance, measuring the time from navigation to the first byte of HTML response. It includes multiple components: redirects, server connections, and request times. Improving TTFB involves optimizing DNS lookups, TCP connections, and potentially using a CDN to minimize latency and enhance user experience. Reducing server response time alone is often insufficient; real user monitoring can provide insights into specific delays, helping to address issues effectively.
https://www.smashingmagazine.com/2025/02/time-to-first-byte-beyond-server-response-time/