Also ensure that the processor's Execution Cap is set to 100% At Processor tab, drag the slider to the right and allocate more CPU's for the VM machine.Ĥ. At Motherboard tab, drag the slider to the right and maximize the allocated memory for the VM machine.ģ.

Open VM settings and select System on the left.Ģ. To allocate more CPU and Memory on the VM machine:ġ. For example, Windows 10 needs at least 4GB of RAM to run smoothly. Allocate More CPU and Memory resources.Īnother cause of slow VirtualBox performance is the low resources you have allocated to the virtual machine. Finally proceed to install Guest Additions again and check if the problem is fixed. Navigate to Control Panel > Programs and Features and uninstall the VirtualBox Guest additions.ģ. But sometimes, especially after a Windows update of the guest machine, it needs to be reinstalled to fix performance issues.ġ. The VirtualBox Guest Additions consist of device drivers and system applications that optimize the operating system for better performance and usability. Remove & re-Install VirtualBox Guest Additions. If not, proceed to the rest methods below. After reboot, start the VirtualBox VM machine and normally the problem will be fixed. Type the following command and press Enter:ħ. * Note: The 'Containers' and the 'Hyper-V' features exists only in Windows 10 PRO.ĥ. Navigate to Control Panel > Programs and Features > Turn Windows features on or off But, when Hyper-V feature is enabled, VirtualBox VM runs very slowly and must be disabled.ġ.

Hyper-V is a hardware virtualization product built into Windows 11/10/8.1 Professional and Enterprise Editions and on Windows Server 2012 and later versions. Change Graphics Controller in VirtualBox.FIX: VirtualBox Machine Runs Slowly on Windows 11/10. This tutorial contains several methods to optimize VirtualBox's performance under Windows 10 and Windows 11 OS.

If you are experiencing such a problem and want to make VirtualBox run faster, continue reading below. After installing VirtualBox on a Windows 10 or 11 host machine you may notice that the guest VM machine is running very slowly for no apparent reason.

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