Interface is taking lots of time for first time execution

Hello all,
I have one inbound interface in which i am updating T-code CO01 ,CO15 , MIGO and MB1A respectively
depending upon the condition in the incoming file.
When ever i run this interface for the first time it takes lots of time for execution, but when i run the same interface again with the same file it is taking half time of the first time execution.
I am not able to understand why it is taking lots of time for first execution and after that execution time is redued very much with the same file
Kindly help
Thanks
Sachin Yadav

thank you santhosh for your reply..
as this program is in Production system it it taking 3 to 4 hour to execute.
Previously it was OK but from last 2 to 3 moths it is taking more time.
when i debug the code it is working fine. I din't find any point at which it is taking more time.
I am not aware about buffers and SAP memory. can you plz help
Do you have any idea why this is happening.
Or how can i rectify the problem?
Thanks
Sachin

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