virtualbox.org

Hi,

I used to use VirtualBox.
But suddenly Win10 or Server2012 guest are extremly slow and this with new hardware.

Host: Windows 10 2004 64bit
CPU: AMD Ryzen 5 3600
RAM: 16GB
Mainboard: MSI X470 GAMING PLUS MAX

VirtualBox 16.1.14

If I boot Win10 Pro guest it takes two minutes to boot.
Server 2012 starts also slow. If I click the Desktop-widget nothing happens anymore.

Here's the 2012 guest config:
CPU: 6, PAE/NX active, nested VT-x/AMD-V active, nested paging active
RAM: 8192 GB
GPU: VBoxSVGA, 256MB, 3D active
HDD: VMDK 200GB on hosts SSD

Let me know if you need something else.

I'm not surprised it's slow: you allocated 100% of available cores (6*) to the VM, leaving none for the host OS, which is also where VirtualBox lives (the VM is not VirtualBox). VirtualBox and the host OS will not run well with 0 CPU time allocated to them. Also, threads are not cores.

Reduce CPU allocation to 2 cores. No more, no less.

If you continue to have problems then view the guest Task Manager to find out what's hogging the CPU.

I'm not surprised it's slow: you allocated 100% of available cores (6*) to the VM

This is not the problem. There are 12 cores available.
I used always 2 cores just allocate 6 cores to test if this solves the problem.

mpack wrote:Also, threads are not cores.

mpack wrote:If you continue to have problems then view the guest Task Manager to find out what's hogging the CPU.