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File transfer rates

I'm currently copying 4 gigs of wedding photos from my desktop to Karen's laptop. I originally set the files up as a shared folder on our network. When I went to copy them, Windows estimated that the transfer would take over two hours.
So, to save time, I burned a DVD (which took maybe, 5 minutes) of the files and then copied its contents to Karen's computer. Transfer time (including burning): 50 minutes.

Why in the world is it so much faster to do it this way? Does it have something to do with the sheer number of image files and having to open up a "portal" for each individual file? Would it be different if I had one 4gig file rather than a bunch of small files that add up to 4gigs?

Edit: Just talked to Forest, who suggests that it could be that the DVD drive has a faster read speed than you can transfer wirelessly.

Edit: Phil says it's lag.

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