Glossary term
What is TTFB (Time to First Byte)?
TTFB stands for Time to First Byte.
In The Browser Contract
Time from sending the request to receiving the first byte of the answer. It includes network time and the server's work.
Learn it properly · The Browser ContractLesson 0: What Happens When You Type a URL (The Full Version)The full trip from pressing Enter to seeing pixels: DNS, TCP, TLS, HTTP, then reading the page and painting it. Caches skip most steps. Every other lesson in this series fits on this map.In Networking for Developers
The time from sending a request until the first byte of the answer arrives.
Learn it properly · Networking for DevelopersLesson 8: Debugging Network Problems and Networking Interview Questionscurl, dig, ss, tcpdump and Wireshark basics, a troubleshooting checklist, and interview questions with model answers.