SMTP Transaction Time 9.001 seconds - Not good! on Transaction Time exchange 2013 sp1

SMTP Transaction Time      9.001 seconds - Not good! on Transaction Time.

I am getting this warning while I do the smtp testing in the toolbox web site. Pls advice. I have 2 CAS in WNLB and 2 Mailbox in DAG. I use sonic wall fw to publish my exchange 2013. I am forwarding the stmp req to my CAS NLB IP from the fw.
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Adam FarageEnterprise ArchCommented:
9 seconds for end to end email actually isn't that bad..

If you are truly concerned, then I would recommend reviewing this article:

The perfmon counters should be somewhat the same between Exchange 2007/2010 and 2013. The other thing is SMTP latency testing, but I would have to spin my lab up to figure out how to enable this for Exchange 2013.

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