virtualbox.org

Hi. I haved installed VirtualBox 4.2.18 on my Windows 8 64bit computer.
Host spec: Intel Core i5 3317UM, 12 GB RAM, 500GB HDD

Unfortunately, any Linux Virtual Machine is extremely slow while using.
I have maneged to install Ubuntu 12.04 (32bit), but installation last a few hours. Starting Ubuntu continues for 60-90 minutes, but after it cannot be used because of slowness and freezes.

Yesterday I have downloaded Linux Mint (32bit), but even running it as LiveCD, is very very slow and almost unusable.

I assign 3GB RAM to virtual machines and tried different settings and features enabled but it didn't help. Hoew can I check what causes such slowness?

Sounds like you need to enable hardware virtualization in the hosts bios.

Hi Perryg, thanks for your reply.

But please, have a look at my Bios options:
In the first SysInfo tab I can see that VT-x is supported (it is not editable - I cannot change anything here).

In the second Advanced tab I can change only features as seen on the image, there is nothing related to virtualization, I guess.

Third Security Tab allows me to set some passwords. And the last one Boot tab allows to set boot order etc.

I cannot find anything associated with virtualization in my Bios settings.

Post the guests log file (as an attachment)
See Online Users Manual for the location of the file.

I am sending log files as attachments.

Do you have Hyper-V installed in the win8 host?

Yes, it is enabled in Windows Features in Programs and Features from Control Panel.
And I have access to the Hyper-V Manager in Win8 host system.

Then that is your problem. Windows loads the Hyper-V at boot and does not allow anything else to access VMX. AFAIK they are the only ones that do this and you need to make a decision.
1) remove Hyper-V
2) set it to not enable at boot
3) use Hyper-V and nothing else.

OK, I see, thanks for your help.
The Hyper-V is required by MS Visual Studio for Windows Phone, as I am developer and I am using this IDE.
There is a Windows Phone emulator run as Virtual Machine, but I didn't know, that it will be causing any problems.

Thanks once again. I have to make decission which one use now.

Or set Hyper-V to not load at boot. This is usually what those do that require Hyper-V but also want to use a different hypervisor as well.