>The difference in the "feel" of how fast my dual-core PC is vs. my
>single core laptop is significant.

I had a dual processor system at one stage, where a non-multithreading 
program doing 3D dispaly seemed to run faster than might be expected. I 
reckoned that one processor was running the program, while the 
multithreading part of Windows put the screen handling into a seperate 
thread on the other processor. 

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