Are you trying to make sure the ACE/CSS does not delay the response ?
Or do you want the ACE/CSS to detect if the server is too slow to respond ?
On the ACE you can set a probe max response time to 1sec and if the response does not come within this time, the probe goes down.
The command on ACE, under the probe config is :
receive Configure max time to wait inorder to receive reply from server
Otherwise, the sniffer trace if you just want to have a look and make sure about the time.
Gilles.