You're not going to see a significant performance improvement in things that are single-threaded, Adam. So, VPC -- which is basically single-threaded -- isn't going to run faster. Yes, the additional CPU will help... but GHz isn't everything, as you can see.
While I don't think the issue is missing drivers, when moving to a brand new machine I'd suggest using Migration Assistant. Often, those machines come with special builds of the OS that contain new system enablers. Subsequent OS releases "roll things in", but when it's new it's best to migrate.
When 10.4.4 (or whatever) comes out, the OS release will be the same again, of course.
So -- definitely Migrate and see if you notice anything working better. But don't expect a huge improvement: apps have to be written to take advantage of multiple processors, and not all are... and I/O bound apps won't benefit at all.
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--Dave Nanian
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