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Thank you very much for the informative reply.
Update:
I cannot get the latency below 40.000 (3 x glxgears, 3 x youtube video running), so if i set base_period 35000 in the ini file, then i get a unexpected delay on start up, but the machine works well now and does not loose steps.

I have again played arround with the Bios settings for at least 4-5 hours, but something came to mind: The VGA, which is a old Nvidia card. I tested with a other card, a old Geforce card, but about the same result. Unfortunately i dont have a Radeon card to test, but i just ordered a AMD Radeon HD 7450 1GB DDR3 card for about 10€. In 2 days i will be able to test it. If nothing changes to better, then i think i will buy the 7i92T. (thanks for the suggestions)

I will update in 2 days.
Thanks and best regards.

Hi,
thanks to all for the suggestions!
did several checks today

1. start vs end positon -> 1.3 mm positive error on both axis -> accumulated error on both axis
2. checked step pulse width = base period 
3. mechanical test -> turned motors by hand while keep high resistance on the Z-axis plate -> everything feels rock solid with no observable backlash
4. tuning servos -> I use the T3D servodrive von HLTNC, did  several tests with different filter and timing values -> unchanged
5. something very strange did happen also today... by accident I run a testprogramm with 12.000 mm/min -> the circle was perfectly straight :O

still to do -> check electrical connections as Peter mentioned.
 

I know this is an older thread, but I recently had success doing this.  I wanted to run the Windows-based configuration/tuning utilities for my EtherCAT servo drives without hauling a laptop to my shop.  I installed QEMU/KVM on my LinuxCNC development machine, installed Windows 10 in a virtual machine, and it works fine.  I'm able to redirect the USB-serial devices into the guest OS so the software is able to communicate with the drives.

I've tested this with the software for the LeadShine EL7 series (Motion Studio) as well as the software for the StepperOnline A6 servos.

I have not done extensive testing in terms of the impact on realtime performance, but if there is any effect I haven't noticed it.  LinuxCNC runs fine even while the guest OS is running, and there are no realtime warnings or unexpected behavior when operating the machine.  When this conversion is completed, it will be running on a less capable processor with less RAM, so I won't be doing this for "production" use, but it's great for development purposes.