RAM Usage
Virtualization software allocates a portion of your Mac's RAM to each virtual machine. Windows 7 and Vista run much better in at least 1 GB—if you can spare it; although you can generally run Windows XP at a reasonable speed in 256 MB, some users have found that to be too little, especially when in Full Screen mode (see Working with Windows and Views). If you run a 64-bit version of Windows, consider doubling these amounts. And in any case, if you find that Windows performance is unusually slow, try increasing the virtual machine's RAM allocation.
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