use wireshark captureing http delays
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set the Time column to the following format
View -> Time Display Format -> Seconds Since Beginning of Capture
As the client is also able to send several requests at the same time (in different TCP connections) you need to check the TCP Stream number as well. For this purpose, please add a new column in the GUI for the tcp.stream value. Here is how to do this
Edit -> Preferences -> User Interface -> Columns
Add a column called "TCP Stream". Then choose Custom as type and tcp.stream as value.
Then sort the GUI by the "TCP Stream" column.
Then use a Time Reference (CTRL-T in the GUI) for easy delta time calculation between request and response. As you can see the 'delay' (delta) between request and response is 2.144 seconds for the first request and 0.2605 for the second request.
https://ask.wireshark.org/questions/23168/capturing-http-response-delays