Citrix Performance problems after upgrading to 12.1.2 with User mode

Hey All, 

We have several clients with Citrix farms that we've recently upgraded from SEP 11.0.X to 12.1.2 and only 2 have noticed a considerable decrease in performance as a result of the upgrade.

All clients  have the same policies (exceptions included) applied and we have reviewed documented from both Symantec and Citrix.  The only differences that we've found is that for the clients who had a performance issue, they both used user mode policies to some extent and are currently on Windows Server 2003.  

Has anyone else experienced this issue?

Thank you,

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