Hyper-V migration from old hardware to new hardware cause Kepware not to respond timely on OPC DA

Hello, 

We run Kewpare 6.16 on a VM Hyper-V for long time. The old system was Windows 2012 R2 and we use Kepware to feed our own Software using OPC DA communication. This system was running quite fine. After we migrate the VM to New Hardware our software is dying on resources on the system. After troubleshouting we found out that the request from our Software (Multi Clients) via Kepware to the Data Server are not responded in time. 

But looking at the Task manager of the system we could not find any issues. Processors, Memory, Disk and Network are showing no issues. the new hardware is comparable to the old hardware.

When we disable the Kepware Service on the computer the system is running fine and is responding timely, but starting the communication with Kepware let the system dying of resources. It seem the requested are not answered timely. When starting only one or two clients the system is reacting correctly but with more clients started on the system the system getting slow and slower. 

We checked all necessary own issues about HYper-V Settings, but none made a difference to the performance of the system. So the only change we did it, to copy the Hyper-V to new hardware.

Thank you,