Thank you very much !

I have modified /etc/ovirt-engine/osinfo.conf.d/00-defaults.properties file and added the last line

# Windows10x64
os.windows_10x64.id.value = 27
os.windows_10x64.name.value = Windows 10 x64
os.windows_10x64.derivedFrom.value = windows_8x64
os.windows_10x64.productKey.value =
os.windows_10x64.resources.maximum.ram.value = 2097152
os.windows_10x64.cpu.unsupported.value = conroe, opteron_g1
os.windows_10x64.sysprepPath.value = ${ENGINE_USR}/conf/sysprep/sysprep.w10x64
os.windows_10x64.devices.display.vramMultiplier.value = 2

The vm has the "Windows10x64" profile configured

Restarted the ovirt-engine vm, powered on the Windows 10 vm. Not any difference...The console is very slow, almost unusable.

Also, tried to upgrade spice-server on the node, but it seems that there aeno updates available. At the moment, it is installed:  spice-server.x86_64                           0.14.0-2.el7_5.3

Any thoughts ?

Thank you !

Leo