what are effects when introduced delay in exploit?

[msairam at intoto.com (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 ,
   ----
Sairam