Multi-tasking to reduce time

I have following scenario.

Control program reads through a control file (control file has list of 
transactions to be processed) and calls programs as below:
CREATE_TRAN_INFO -> this program writes record in CREATE_TRAN_INFO phy. file 
per transaction
CREATE_CASH_INFO -> this program writes record in CREATE_CASH_INFO phy. file 
per transaction
CREATE_COLLAERAL_INFO -> this program writes record in CREATE_COLLAERAL_INFO 
phy. file per transaction
(Lets call these as work programs)
If all work programs run successfully, control program flags transaction as 
processed and commits. 

This is taking about 20 min. to process around 40,000 transactions. I need to 
reduce this by 40% to meet SLA specified. Can I get some ideas on how best can 
this be achieved.

I could think of creating IN and OUT data queues for each work program. Take 
them out (from inline call) to a separate job that runs in batch. Control 
program feeds these programs through IN data queue and picks the processed part 
from OUT and also writes to the respective phy. file. 
I am of the opinion that there would be too many dynamic calls to QSNDDTAQ and 
QRCVDTAQ, not sure if the objective would be achieved.
Just for note, all work programs can run independently at the same time.

Any help is greatly appreciated.

Best rgds.,
Srikanth D

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