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Have a look at the transum dissector. It calculates (amongst others):

• Time to first byte (server response time) as transum.st
• Time to last byte (network transfer time) as transum.rspspread

And there are other transum fields that give insight in request/response transactions. The field names are not always intuitive, but it's not difficult to figure it out.

Oh, you do need to enable the transum dissector first, as it is disabled by default. (can be done at: Analyze -> enabled protocols -> search for transum -> enable)