There is no individual shadow option for the entire skin, there are just many individual ones for all the separate areas. It could be done if someone wanted to do it, but I really do not think it's worth the time it would take. Those skins have been exactly as they are now, with shadows and rounded corners, for over two years without any issues or complaints. If it was truly a "huge" slowdown for multiple people, there would have been comments on it before now. We already have some very stripped down skins anyway. Morbid has some shadows and rounded edges, but far fewer than the others and it is blazing fast. For a really stripped down version, Lightweight cuts out all graphical frills. I don't think it's possible to get any faster than Lightweight.
If I have some time, I'll see if I can find another really basic skin without any graphical enhancements at all.
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