Server Response Time (TTFB)

How long the browser waits from sending the request to the first byte of the response arriving — the only stage in the loading chain that your own code and database optimizations can shorten.

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Updated: Dec 2025

Computational logic

TTFB is measured from the moment the request is sent to the first byte of the server's response arriving, and includes server processing time, database queries and any middleware on the path; the card's basis is P75. To find heavy routes, the "Server response by page type" box plot separates static pages, dynamic paths and API endpoints.

Use-case narrative & business value

If Connection time is low but this number is high, the problem is definitely on your code or database side — the heaviest stage in the chain, and the only one your engineering team actually controls. The page-type breakdown chart tells you exactly which layer (static pages, dynamic paths, or APIs) needs optimizing, instead of guessing across the whole codebase.