On systems with lesser memory resources and/or those with slower processors switching to the classic theme will definitely help out since there is no requirement to store or draw the theme graphics. Although there is (in XP) no acceleration going on, there is still work that has to be done to transmit the image to the video card, and so the drivers would have some small part to play. The amount of the performance increase is debatable and I would imagine it to be highly variable upon your system's CPU, memory, and a few other factors that are probably negligible (such as video drivers and video memory - is it shared or on the video card).
the work necessary to draw the button using the older logic. Because these themes often require resizing and/or tiling (and in newer incarnations: animation), there is a lot more work going on to display the graphic element for a button vs.
Longer answer: Themes are basically a collection of graphic images that are drawn to the display buffer instead of using the older logic of using solid colors and lines. Short answer: disabling XP themes definitely increases system performance and reduces the memory load.
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