Guest OS .................... Win 8.1 Pro installed in VMware Workstation 12 (free edition).
Host OS....................... Win 10 Home.

I find out that after switching back from Guest OS, Win 10 is sluggish. In fact programs would freeze for a short time.
Once I had to restart. After that everything is back to normal.
That happened TWICE.

I don't suppose that is normal. This is not my first time using VMware Player although last time was 2+ years ago.

I did do sfc and chkdsk f/r and that do not seem to have an effect.

Disk defrag ( Auslogics ), disk cleanup ( Ccleaner ) and malware scan ( Malwarebytes free edition ) were performed.