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I too am giving 26.4 a spin. I think this covers my problem (below). I was trying to find 26.2.1 when I found 26.4 " "Fixed: Various issues that...
I am having the sluggish mouse problem, as well. It began when I upgraded from Parallels 15.1.4 to 16.0.0. I run two Win10 VMs on my 15" MBP...