Integration

My project have a requirement of processing large file (10 MB) all at once. In the project, the file adapter reads the file, then calls 5 other BPEL process to do 10 different validations before delivering to oracle database. I can't use debatch feature of adapter because of Header and detail record validation requirement. I did some performace tuing (eg: auditlevel to minimum, logging level to error, JVM size to 2GB etc..) as per performance tuing specified in Oracle BPEL user guide. We are using 4 CPU, 4GB RAM IBM AIX 5L server. I observed that the Receive activity in the begining of each process is taking lot of time, while other transient process are as per expected.

Following are statistics for receive activity per BPEL process:
500KB: 40 Sec
3MB: 1 Hour

Because we have 5 BPEL process, so lot of time is wasted in receive activity.
I did't try 10 MB so far, because of poor performance figure for 3 MB file.

Does any one have any idea how to improve performance of begining receive activity of BPEL process?

Thanks
-Simanchal