Big messages inside BPM

Hello
I cannot avoid the using of BPM. The sender system could send big messages 5-20MB (with binary data).
I have synch HTTP -> BPM (1:N) mapping) N could be 10-30.
BPM has forEach block and send synh messages to FRC receiver for each message.
Is it possible to estimate how it influence on performance of XI?
Is this scenario viable?

Hi Denis,
Upto 10 MB, I have executed the similar scenario. It took around 10 secs for each RFC call. And it is also synchrnous. Here the catch is , the XI is taking around 6 Secs, but RFC exceution is taking 4 secs. SO comparitively it is ok , I feel. And it depends on the message for each RFC call. For e.g each message has muliple line items, then RFC execution will take more time. 
But if possible, you can try this with Sync, ABAP proxy, by sending entire message at once, and inside the proxy looping thru each message ,and get the response at one time.
Thanks,
Moorthy

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