The answer
Slow server processing, cold starts, slow databases, network latency, and weak caching are common causes.
What Is Time to First Byte and Why It Matters
What causes high TTFB?
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.
Because the browser cannot start rendering useful content until it receives the response, so the page feels blank or stuck.
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