Why Ubuntu is slow in VirtualBox? Re: VirtualBox – Ubuntu 20.04 Server very very slow
Reduce VM CPU cores to 2. I would also reduce RAM to 8192MB (i.e. try not to use more than half of a host’s available RAM). Increase graphics RAM to 128MB. Uninstall the Ubuntu fork 6.1.
How can I make Ubuntu faster on VirtualBox? To correctly enable 3D acceleration on VirtualBox virtual machines running Ubuntu or other GNU/Linux distribution, go to Settings > Display and select “VMSVGA” as the “Graphic Controller” and check the “Enable 3D Acceleration” box under Acceleration.
Why is Linux so slow in VirtualBox? VirtualBox virtual machines are slow, thanks to the default VM configuration. If you use VirtualBox to run Linux, you may notice that performance isn’t great, and are looking for ways to improve it. It is possible to improve your Linux VM’s performance by tweaking settings in VirtualBox.
Why is My VirtualBox VM so slow? Increase the CPU speed
Setting it to 80% made the minimum speed 2GHz on mains power, which was fine for running the virtual machine. To do this, go to Power Options in the Control Panel and next to the Power saver plan, click Change plan settings. On the next screen, click Change advanced power settings.