Are there any send/receive shapes inside the loop? That would involve all Biztalk’s logging and database interaction. If no sends/receives, what are you doing inside the loop?
There is a \”File Dumper\” utility that will show you the C# code generated by a Biztalk compile:
http://www.gotdotnet.com/Community/UserSamples/Details.aspx?SampleGuid=1a57f0a5-3c3d-4a97-a762-0825daf15ab0
This might give you a rough idea of what Biztalk is actually doing – but it may call many Bitalk functions which you won’t have source code for.