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NAV 2009 client slow on Hyper-V

So we are planning to move our infrastructure with NAV 2009 from a hardware environment to a virtual environment. But the first tests on our virtual platform are going bad with performance. But it looks like the NAV client is de bottleneck.

We are running NAV 2009 R2 build 6.00.33194. NAV is maintained by our partner, who has build a retail supporting environment inside NAV. So we are not programming NAV ourselves.

Our current platform is:

HP DL380G5 with 2 core and 32GB memory
Attached are 2 MSA60's 40 SAS disks RAID10
Running Windows 2008 R2
SQL Server 2008R2 as database

Out new platform will be:

HP C7000 blade 3PAR SAN attached using SSD and SAS disks
BL460 with 2 cores and 256GB
Running Windows Server 2012 Hyper-V hosts
Windows server 2012 R2 VM for the SQL Server 2008 R2 NAV environment
The VM is assigned 6 procs and 128GB of memory.

The new hardware is a big improvement compared to the current hardware platform.

What we are now testing is on the new platform is a long running tasks that is dividing our itemstock over about 250 stores, according to the available central stock and sales history in the stores. In our current platform this process takes about 5 hours to run. But on the new platform this process takes more then 7 hours with the same data. Not what we expected to happen.
The task is running in the NAV client. Analysing the hardware performance we found that the hardware has no problem with performance. It looks like the client is just slowing things down on the new platform.

Does anyone have experience with moving to a virtual (Hyper-V) environment and ran into the same problems? Do you have any suggestions in things to check/change to improve performance?

Thanks.

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