Why does it take longer to Save with Layers v. no Layers?

I've noticed that file save times go way up even with just 1 layer (plus Background) compared to saving with no layers. "Flat" PSDs save very fast, whether to my SSD boot drive, or to my spinny work drive.Is this normal? And can anyone tell me why?
My scratch disc is on my SSD boot drive. Windows 7 Ultimate fully updated. I have 30GB of RAM and my average file size (open) is around 400MB. I do have the compatibility turned on (otherwise Lightroom doesn't like it), and compression. I understand those will add more time. But why so much more than a "flat" PSD?

Thanks. I need to rephrase my subject line I guess...
Obviously, additional layers will take longer to save, because, like you said, each layers is like another image (sorta). HOWEVER, the save time seems to increase EXPONENTIALLY just by adding 1 layer.
Here's a specific example...
I'm working on a 7360 x 4912 image which Photoshop says is 206.9M. It takes less than 2 seconds to save the PSD.
I clicked Ctrl+J to copy the Background layer to a new layer. Now there's the Background layer, plus Layer 1, and now Photoshop tells me it's 206.9M/413.7M. Now it takes 34 seconds to save the PSD!
So it's not just double, it takes 17x longer!!! Why so much longer?

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