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Sorry friend, the connection between Win10 being slow and upgrade of || to v13 is unlikely to exist in the provided facts. I would ask you for the...
Let's see what it turns out to be - wonder if Apple reacts, but so far disabling Direct X support in VM properties really helps.
I got this issue as well as I upgraded to High Sierra - artefacts when switching between full screen OSX and WIN10, even worse - I use Skype for...