Mail Delay from Exchange to Smart Host

I have this POC setup.  I have 2 smart host appliances sending and receiving.  Exchange 2010 sp3.
Mail flow in/out working fine.  I have one send connector with both the hosts in it with IPs.
I notice when ever I send an email from Outlook it take about 15-40 seconds of delay between exchange and Hosts.  The delay seems to be on exchange side sending to the host.
Any thoughts?  I will do some more tests ...
Tnx

If I put one host in the connector then there is NO delay at all. 
It appears that when there are 2 hosts in the One connector exchange takes its time to figure out that to which host should it send hence causung they delay ranging from 20 to 45 secs.
!deaz?

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