Measure time to first byte from a real request.
Free, no signup. We fetch the page once and read what your server sends back.
Time to first byte is how long the server takes to start answering. It sits underneath every other speed metric: no amount of front-end optimisation fixes a server that takes a second to think.
Under 500ms is comfortable, under 200ms is good. Over about 1200ms is a genuine problem that will show up in Core Web Vitals.
Not directly, but it feeds Largest Contentful Paint, which is. A slow server makes every Core Web Vital worse and nothing else you do compensates.
Network conditions, server load and caching all vary. Run it several times and take the pattern rather than any single figure.
No. It is measured from our server, so treat it as a relative indicator rather than a real-user measurement. Search Console field data reflects real visitors.
Run the full free report, or have us go through it with you on a call.