Jobs Executing slower when called from Job sequence

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Hi,

We have 12 jobs in a job sequence.When we run that job sequence, the job activities in the sequence are taking long time to start and to get finished as well. But the same jobs which were called in job sequence are executing much faster when they are executed separatly(i mean out side sequence).

Are we missing to set any options for getting jobs executed much faster?
We are using Datastage v8.0.1 on windows.
Any ideas?

Thanks....