Time to first byte is how long a server takes to start answering a request — the delay before the first byte of the page arrives.
Crawlers fetch with budgets. A slow first byte pushes a fetch toward a timeout and a truncated read; the opening is read, the rest is not.
curl -o /dev/null -w "%{time_starttransfer}" your page.
Checked by Reflexa: Does your server answer fast enough for a crawler? — part of the 23 checks on every page check.
Time to first byte is how long a server takes to start answering a request — the delay before the first byte of the page arrives.
Crawlers fetch with budgets. A slow first byte pushes a fetch toward a timeout and a truncated read; the opening is read, the rest is not.
curl -o /dev/null -w "%{time_starttransfer}" your page.
The free page check runs the 23 checks on your public pages — the terms on this page, observed on your pages.