Running XP in Virtualbox

To run Windows XP efficiently on Virtualbox...

• Use 1 core
• Disable PAE/NX

• Disable IO APIC
• Disable EFI

• Use SATA storage for the drives (you'll need to install drivers for this)

Disable VT-x/AMD-V
Enable Nested Paging
These appear dependent on support for them.

Ref : XP Speed Tips