HTTP Post request taking time

Hello All,

we are working on Siebel 18.12.

we have integration where system is posting HTTP Post request to us.

we have notice sometime it took more time to respond. if we check the execution time WF takes to process it is very less then what is stamp in localhost_access_log file 

for eg 

XXX.XXX.X.XX - - 11.076 [09/May/2021:22:29:52 +0000] "POST /siebel/app/eai/enu/ HTTP/1.1" 56 81b9-a279c973675a 200

from the log file from ai/applicationcontainer/logs we can see it took 11.076 seconds, But when we checked the processing time of WF it took only few milliseconds .

how to find out where it is taking time