We are currently running ESXi 5.5 build 2143827
I have created a few Windows Server 2012 R2 guests that have all windows updates applied and the latest VM Tools installed.
Mouse performance is sluggish within RDP sessions, but instantaneous from the console session within the Vsphere client.
RDP sessions to any other guest OS works perfectly. We are only seeing the issue from 2012 R2.
Am I missing something with server 2012 R2 or is this a known issue?