VMWare Pre-Allocated vs. Growable, which is faster?

VMWare Pre-Allocated vs. Growable, which is faster? In an effort to increase speed in my Vmware setup, I was thinking about converting a Windows XP Guest 32 bit I have from growable to pre-allocated, I'm currently running VMWare Workstation 7 with Windows 7 64 bit as the host.
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Guest [Entry]

Pre-Allocated space is always faster, as there are no background resizing operations and calculations that have to take place. Since you have a dual core CPU, you can also allow your guest to use both of them as well. Keep in mind though, once a VM is already created, it may become unstable if you change the number of CPU cores available. If you intend on using multiple CPU cores, I'd suggest configuring that when you initially create the VM.