Send async message between bpm processes takes long time

Hi all,
We use XI 3.0 SP16.
We have 2 BPM Processes.
One of these Processes sends an asynchronous message, which is directed
to the other (by the receiver determination defined in the directory).
In SXMB_MONI, we see that the "End Time" of the asynchronous send step
is about 3 seconds after the "Start Time".
Furthermore, when the first process sends this message to several other
processes, this time is longer, and gets up to 10 seconds for the
last "send" step in SXMB_MONI.
What can be the cause for this?
How can we minimize this time?
Thanks ahead for any help,
Yoav.

Hi Sravya,
Thanks for your answer.
The main process is similar to the Multicast pattern.
The other process(es) is an Async/Sync Bridge.
We use A/S Bridge for every receiver so that we can first send all requests asynchronously,
and only then handle responses as they arrive.
(Otherwise, a request is sent only after the former response arrives).
However, paradoxically, using A/S bridge makes the whole process take longer (for few receivers) due to the problem described.
Yoav.

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