cost some time to start to run the concurrent

Hi

We defined an add-on concurrent program(Java Concurrent Program).

It is run by standard manager.

Regarding standard manager

Cache Size:16

Processes:20

Sleep Seconds:5

when we run this concurrent.

we found that it cost 3 seconds to start to run,and From run to complete,It only cost 1 second.

From concurrent log files

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Current system time is 27-APR-2015 14:16:25　
XXXWeb service start : 2015-04-27 14:16:28 753     --->3 seconds

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Could you tell me why it cost 3 seconds to start to run

if we want to reduce the time above,what we need to do.

Thanks