Is there a TTFB metric?

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My company are obsessed with ttfb, is there a way to get it from you?

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Fly provide a selection of metrics. I guess the closest may be the http response time:

Or for one-off checks you could use one of the many free external tools e.g to test the ttfb for
https://google.com you could use: https://speedvitals.com/ttfb-test?url=https://google.com

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Our response time metric is as close as we have to TTFB. It’s the from the moment we start processing the request to the moment we’ve written the headers (they’re pretty much the first thing we write back to the client)