I'm about as far from a guru as one can be, but I notice the same thing whenever I'm copying a large number of very tiny files. When I'm copying a few really big files, the speed is much greater. Why this is, I cannot tell you, but it seems intuitively correct that it should be the case. (Even if you have a truck to help you, a ton of loose marbles takes longer to move than one big chunk of granite.)

Poser runtimes have thousands of files, maybe even millions for some of us. It takes a long time to copy all those.

If someone has a better answer than my own "it seems intuitively correct", I'd be interested to hear it. :)

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.