[framework] what are effects when introduced delay in exploit?

[M.P.Sairam]

I am a new to this exploiting and i am working on framework 2.7, if I 
introduce any delay in exploit script at the end how does it effect 
the exploit can any one please explain. I am Using backupexec_agent 
exploit as an example. If IPS is used then there will be some small 
delay in transmission of packets (I guess) then how can I overcome such cases?

Thanks ,
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Sairam