o365 Exchange Online - outlook non-cached - causes 6 second delay when sending

For exchange, we're now using o365 Exchange Online.
Client is outlook 2010.
In cached mode it works well.  When in on-line mode (non-cached), we notice that when sending an email, there is a 6 second delay.  We click the send button, then we get the spinning circle for 6 seconds, then it goes.  Is this normal, and anyone know why?  (normally we use cached mode but not for the remote access vm's)
JohnPaddockAsked:
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Todd NelsonSystems EngineerCommented:
Is the latency 100% recreate-able every time or is it sporadic?  Have you reviewed this article?

https://support.microsoft.com/en-us/kb/2441551
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Todd NelsonSystems EngineerCommented:
John,

Will you provide an update?
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JohnPaddockAuthor Commented:
Thanks.  It's reproducible every time, but it vary's by a couple seconds.  That article led me to the cause.  It seems that 2 of our outlook add-ins are what's causing this. The 'workshare outlook com add-in' seems to add a few extra seconds to email sending, and so does worksites 'EMM' add-in.  The workshare one we'll disable and I'll talk to the vendor about the EMM one.

Many Thanks
JohnPaddock
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