Delay shape issue in BizTalk 2006

Hi,
I am processing very large volumes of messages wherein a bunch of messages are in a sequence.Because of this some orchestrations have a delay introduced waiting for the orchestration before it to complete.While adding a delay of 5 seconds in the delay shape using datetime.utcnow.addseconds(5), i am observing in HAT that it is taking close to 1.5 to 2 mins and even more at times(upto 5 min) for the orchestration to comeout of the delay shape in the orchestration.

This delay shape is in a loop running 120 times.

Any clues as to why this might be hapenin…??

Cheers,
Sujith