Myth: Slow TTFB is always a server problem

Myth: Slow TTFB is always a server problem
Field TTFB p75 = 1.4s; server response time = 110ms. Gap unexplained until you split the metric.
Field TTFB includes redirect chains, DNS, TLS, and connection setup, not just server compute.
— Here a www->non-www->https redirect chain added two full round-trips (~700ms on p75 mobile) before the origin was even hit.
— Collapsing to a single direct hop: TTFB 1.4s -> 0.7s.
Server fast, TTFB slow = look at redirects and connection setup.
Takeaway: 700ms of TTFB lived in a 2-hop redirect, not the server.