The answer
Because the browser cannot start rendering useful content until it receives the response, so the page feels blank or stuck.
What Is Time to First Byte and Why It Matters
Why does high TTFB hurt UX?
More FAQs in What Is Time to First Byte and Why It Matters
TTFB is the time from the request being sent until the browser receives the first byte of the response.
No. It mainly reflects network and server processing time before the browser starts receiving the response body.
Slow server processing, cold starts, slow databases, network latency, and weak caching are common causes.
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