I have a HP laptop with decent specs:

  • Processor: AMD A8
  • Memory: 4 GB
  • Graphics: 1.5 GB (1x 512 MB integrated, 1x 1 GB dedicated; configured in CrossFireX)
  • Operating System: Windows 8 x64

I have installed Ubuntu 13.04 on a VirtualBox virtual machine and have allocated 1 GB of RAM and 1 processor core to it.

The problem is the VM runs painfully slow. When I allocate similar configuration to another VM running Windows 7, it works just fine, even with Aero turned on.

Another problem is when I switch to any VM with mouse integration on, and I switch back to the host OS, the trackpad swipe gestures stops working, even after switching off the VM(s).

  • 1
    assigned at least 2 cores of your quad core CPU. Do you have the guest tools installed? Aug 24, 2013 at 5:48
  • Okay I will try allocating two cores. Do I need to change PAE settings as well? Aug 24, 2013 at 5:58

1 Answer 1


I had the exact same problem with Ubuntu and my experience was that it was mostly Unity making things dreadfully slow. Change from Unity to Gnome, LXDE or some other lightweight window manager and I believe things will become better instantly.

Also, my experience is that any VM should be given at least 2 cores if possible as that also will improve performance. 36 MB or more RAM from the graphics card should be allocated to the virtual machine as this allows full integration between the host and the VMs screen.

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