FIX: VirtualBox Running Very Slow in Windows 10/11. (Solved)

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. If you are experiencing such a problem and want to make VirtualBox run faster, continue reading below.

This tutorial contains several methods to optimize VirtualBox's performance under Windows 10 and Windows 11 OS.

FIX: VirtualBox Machine Runs Slowly on Windows 11/10.

1. Disable Hyper-V & Hypervisor.
2. Remove & reinstall Guest Additions.
3. Allocate More System Resources to VM.
4. Set Power Plan to High Performance.
5. Disable 3D Acceleration in VirtualBox.
6. Change Graphics Controller in VirtualBox.
7. Disable Host I/O Cache in Virtual Box.

Method 1. Disable Hyper-V & Windows hypervisor.

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. But, when Hyper-V feature is enabled, VirtualBox VM runs very slowly and must be disabled.

1. Navigate to Control Panel > Programs and Features > Turn Windows features on or off

2. Uncheck the following features:

• Containers  *
• Hyper-V      *
• Virtual Machine Platform
• Windows Hypervisor Platform
• Windows Sandbox

* Note: The 'Containers' and the 'Hyper-V' features exists only in Windows 10 PRO.

3. Restart the computer after uninstall.

4. Open Command Prompt as Administrator.
5. Type the following command and press Enter:

• bcdedit /set hypervisorlaunchtype off

6. Reboot your PC.
7. After reboot, start the VirtualBox VM machine and normally the problem will be fixed. If not, proceed to the rest methods below.

Method 2. Remove & re-Install VirtualBox Guest Additions.

The VirtualBox Guest Additions consist of device drivers and system applications that optimize the operating system for better performance and usability. But sometimes, especially after a Windows update of the guest machine, it needs to be reinstalled to fix performance issues.

1. Navigate to Control Panel > Programs and Features and uninstall the VirtualBox Guest additions.

2. After uninstall restart your PC.

3. Finally proceed to install Guest Additions again and check if the problem is fixed. If not, proceed to the next step:

Method 3. Allocate More CPU and Memory resources.

Another cause of slow VirtualBox performance is the low resources you have allocated to the virtual machine. For example, Windows 10 needs at least 4GB of RAM to run smoothly. To allocate more CPU and Memory on the VM machine:

1. Open VM settings and select System on the left.
2. At Motherboard tab, drag the slider to the right and maximize the allocated memory for the VM machine.

3. At Processor tab, drag the slider to the right and allocate more CPU's for the VM machine.

4. Also ensure that the processor's Execution Cap is set to 100%

Method 4. Change Power Plan to High Performance.

Another reason for the slow performance of VirtualBox, especially if you are using a laptop, is the power plan you use for how your device consumes and saves power. In order for VirtualBox to run smoothly and without delays, Power Plan must be set to High Performance.

1. Navigate to Control Panel > Power Options.
2. Select Change Plan Settings.

3. Click Change advanced power settings.

4. Change the Power Plan to High performance and click OK.

5. Start the VirtualBox machine and see if it continues to run slowly.

Method 5. Disable 3D Acceleration in VM Settings.

Another reason VirtualBox runs very slowly is when 3D acceleration is enabled.

1. Open VM settings and select Display on the left.
2. Uncheck the Enable 3D acceleration checkbox and click OK.

3. Now start the VM machine and see if it's running faster.

Method 6. Change Graphics Controller in VM Settings.

Another method to optimize VirtualBox's performance under Windows 10/11, is to use a deterrent graphics controller on the VirtualBox machine. So proceed as follows:

1. Open VM settings and at Display options change the Graphics Controller from VboxSVGA or VboxVGA. *

* Note: If it is already VboxVGA, change it to VboxSVGA and see if that makes any difference.

Method 7. Disable Host I/O Cache in SATA Controller.

Although the Host I/O Cache of the disk controller helps VirtualBox to run faster, in some cases it does not.

1. Open VM settings and select Storage on the left.
2. Uncheck the Use Host I/O Cache checkbox and click OK. *

* Note: If it is already Disabled then Enable it.

3. Start the VM and see if it running better now.

That's it! Which method worked for you?
Let me know if this guide has helped you by leaving your comment about your experience. Please like and share this guide to help others.

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Konstantinos Tsoukalas

Konstantinos is the founder and administrator of Wintips.org. Since 1995 he works and provides IT support as a computer and network expert to individuals and large companies. He is specialized in solving problems related to Windows or other Microsoft products (Windows Server, Office, Microsoft 365, etc.).

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