When a virtual machine is controlled via Hyper-V manager, the user can run ínto a keystroke delay. This occured on one of our virtual Windows Server 2008 R2 servers with Exchange 2010 SP1.
This problem only occurs on direct access from HyperV manager. When using RDP connection this issue will not occur.
New installation of integration services did not solve the problem.
Following workaround did solve the problem:
- shut down the virtual machine
- decrease assigned cpu cores from 4 to 1
- start virtual machine and shut down again
- increase assigned cpu cores back from 1 to 4
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