I installed a MacOS on a Windows 10 host by following the article 'install-macos-10-14-mojave-virtualbox-windows' at techsviewer. com.
I noticed a huge lag when starting the machine for the first time. The mouse was very slow and I got multiple keystrokes, hitting one key (e.g. 'a') would result in multiple characters (e.g. 'aaaa'). I found a post indicating that VirtualBox should be started using 'RunAs Administrator'. That seemed to help but after a while the lag returned.

VirtualBox Version: 6.1.16Ubuntu r140961. I am on Lubuntu 20.04 and I have 2 virtual machines. One is a Windows 10 and the other is a Windows Server 2019. Prospective employerclaire edge.

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I then moved the MacOS guest to another host. There I could give it more resources: 4GB > 8GB RAM, 2 CPU > 4 CPU. The MacOS seemed to run more stable, without lag. I then tried to run a higher screen resolution and used the following command to upgrade to 1280x1024

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vboxmanage setextradata 'VMNAME' 'VBoxInternal2/EfiGraphicsResolution' '1280x1024'
To my surprise the lag returned! I had to revert back to the default 1024x768 for the lag to go away. Does anyone know what is causing the lag? And how to solve it, not really a fan of 1024