Exchange 2013 Online mode slow performance

Hello,
We recently moved mailboxes (180 or so) from Exchange 2007 to Exchange 2013.  We are noticing that Outlook navigation seems to be very slow compared to the last server.  Changing folder views, switching from Inbox to Calendar, Deleting items, etc. 
Also we used to be able to send 40MB HTML emails very quickly.  This now takes about 5 min just to open a reply. (These are tripwire reports.)  Most users are using Outlook in Online mode on the new server and were using Online mode on the old server
Environment: Exchange 2013 SP1 on Server 2012r2 Standard (6 cores 24 gigs of RAM, VMWare VM.)  Old server is Exchange 2007 8.3.348.2 on Server 2008x64 Standard SP2 (8 cores 12 gigs of RAM.
Physical.)
I have a ticket open with MS but didn't really get anywhere after 9 hours yesterday.
Thanks.

Hi everyone,
Here we have exactly the same thing. We did the same migration from Exchange 2k7 to Exchange 2013. We run on a VMware 5.5 infrastructure. We have a lot of users running on a VM, but I can also tell you that I'm experiencing the problem even on a physical
PC. So the problem about the client side infrastructure is maybe not that much related.
 I also found an old thread talking about a known issue with the grouping option in Outlook and online mode, but this is supposed to be only for Exchange and Outlook 2007, so i'm not able to prove this problem is exactly and only related to this issue.
however, I tried to disable the grouping option for some folder in my Outlook and I saw an improvement immediately. Here is the thread talking about this issue and the knowledge base associated from Microsoft:
http: //blogs.technet.com/b/mikelag/archive/2008/08/31/slow-outlook-online-mode-performance.aspx
http: //support.microsoft.com/kb/948828
Sorry, I cannot post the real link since my account is not verified yet... simply remove the space.
If anyone finally found an answer please post-it, thanks.

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